The Colubrine Venemous Snakes.
These are comprised under the one family, Elapidæ, all of which have an erect, immovable, grooved, or perforated fang in the fore-part of the maxillary bone. There is little in their external appearance to distinguish them from the harmless Colubrine Snakes, to which they are more nearly akin, in all but their poison-fangs, than they are to the Rattlesnakes and Vipers; yet some of the most poisonous of Ophidians appertain to this family, as exemplified by the well-known Cobras of the Indian region and of Africa, and also by some of the worst Snakes that inhabit Australia. In the colony of Victoria alone as many as ten species of Snakes are known, one only of which, Morelia variegata, is harmless; and one only of them, the formidable Death-adder (Acanthopis antarctica), belongs to the sub-order of the Viperine Snakes. The rest are included among the Colubriform Venemous Snakes, and most of the accidents from poisonous Snakes in that colony are due to what is there known as the Carpet Snake, Hoplocephalus curtus, while the Snake that bears the same name in the adjacent colony of New South Wales is the innocuous Morelia spilotes, which is a small Serpent of the family of Pythonidæ. Of the total number of Snakes known in all Australia, by far the greater number are venemous, which is the reverse of what occurs elsewhere. Only about five species, however, are really dangerous throughout the great island-continent, for in many of them the poison is by no means virulent. Thus, of Diemansia psammophis, which sometimes exceeds four feet in length, Mr. Krefft remarks that "its bite does not cause any more irritation than the sting of a bee." Also, that "the bite of Hoplocephalus variegatus is not sufficiently strong to endanger the life of a man. I have been wounded by it several times," writes Mr. Krefft, "and experienced no bad symptoms beyond a slight headache; the spot where the fang entered turning blue to about the size of a shilling for a few days." Again, of Brachysoma diadema, "this very handsome little Snake is venemous, but never offers to bite, and may be handled with impunity." Far otherwise, however, is the venom of Hoplocephalus curtus, and also of some others. H. curtus is one of the worst Snakes of Australia, where it inhabits the more temperate parts of the country from east to west. Its bite is almost as deadly as that of the Indian Cobra, to which it is, indeed, considerably allied. "A good-sized Dog bitten became paralyzed within three minutes, and was dead in fifty minutes afterwards; a Goat died in thirty-five minutes; a Porcupine Ant-eater (Echidna hystrix) lived six hours; and a common Tortoise, an animal which will live a day with its head cut off, died in five hours after being bitten." The H. superbus replaces it in Tasmania.
The Cobras (Naja) are widely known, alike from the virulence of their poison, and for their remarkable dilatable disk or "hood" on the nape, the ribs which support this hood being much elongated. Two species are commonly recognised, the Cobra di capella of Southern Asia (Naja tripudians), and the Asp (N. haje) of Africa; but there are marked local varieties of both species, and the N. sputatrix of the Malay countries should probably be recognised as a third species. Those of India, with Ceylon, have a mark like a pair of spectacles upon the hood, while those of Burmah and the neighbouring countries eastward have only an oval black spot upon it. In India the commonest colour of this formidable reptile is uniform brown, though many are of a pale yellowish straw colour, and there are others of every shade between that and black. It grows to a length of about five feet, seldom more. "Almost every writer on the natural productions of the East Indies," remarks Dr. Günther, "has contributed to the natural history of this Snake, which has been surrounded by such a number of fabulous stories, that their repetition and contradiction would fill a volume." It is very generally diffused over the Indian region, though, as Mr. Theobald notices, from its nocturnal habits it is less often seen than many harmless species. "This Snake is, I believe," he adds, "of inoffensive habits, unless irritated, but is, of course, a dangerous neighbour to have in a house.[13] Not only in Burmah, where the respect for animal life is greatest, but in India also I have known a Cobra enticed or forced into an earthen jar, and then carried by two men across a river, or some distance from the village, and liberated. Dr. Günther remarks that, 'singularly enough, it has never been obtained in the valley of Nepâl.' This is very easily accounted for," continues Mr. Theobald, "since few would venture to kill a Cobra, even for scientific purposes, in the rigorously Hindu state of Nepâl. In British India, decent Hindus will not kill a Cobra; and if one has taken up his abode in a house, he is permitted to remain, or else carefully inveigled into an earthen-pot, and carried away as described. Of course only the orthodox Hindu is so careful to abstain from injuring the Cobra, and their reverential feeling is now perhaps rather the exception than the rule, though probably as strong as ever in Nepâl." A fine example of the still more formidable gigantic Cobra (Hamadryas elaps), to be noticed presently, was obtained from an earthen pot which had floated out to sea.
The late Sir J. Emerson Tennent mentions that "the Cinghalese remark that if one Cobra be destroyed near a house, its companion is almost certain to be discovered immediately after—a popular belief which I had an opportunity of verifying on more than one occasion. Once, when a Snake of this description was killed in a bath of the Government House at Colombo, its mate was found in the same spot the day after; and again, at my own stables, a Cobra of five feet long having fallen into the well, which was too deep to permit its escape, its companion, of the same size, was found the same morning in an adjoining drain.[14] On this occasion the Snake, which had been several hours in the well, swam with ease, raising its head and hood above water; and instances have repeatedly occurred of the Cobra di capella voluntarily taking considerable excursions by sea" (or by rivers, as the writer has personally witnessed).]
Cobras are much dreaded, for they instil the most subtle poison into their bites. Their manners are very singular. When at rest the neck of the animal is no larger in diameter than the head; but when under the influence of passion and irritation the neck swells at the same time that the animal raises the front part of his body vertically, holding this part straight and rigid as an iron bar. The lower part of the body rests upon the ground, and serves as a support to the upper part, which is movable and capable of locomotion. This faculty of dilating the neck is as striking a trait in the organization of the Cobras, as the rattle is in Crotalus. The ancient inhabitants of Egypt adored them; they attributed to their protection the preservation of grain, and allowed them to live in the midst of their cultivated fields. The Cobra is no longer an object of adoration in the East, but is held sacred by many people, and it serves in nearly every country of Asia as a very curious spectacle; being the Serpent chiefly used by snake-charmers in these countries, terrible as it seems to us.
Fig. 17.—Snake-charmers.
Fig. 18.—Hooded Snake.
The action of the snake-charmer is as follows: he takes in his hand a root, the virtue of which is supposed to preserve him from the venemous effects of the bite of the Cobra. Drawing the reptile from the cage in which he keeps it confined, he irritates it by presenting a stick to it; the animal immediately erects the fore part of its body, swells its neck, opens its jaws, extends its forked tongue, its eyes glitter, and it begins to hiss. Then a sort of battle commences between the Serpent and the charmer; the latter, striking up a monotonous sort of song, opposes his closed fist to his enemy, sometimes using his right hand and sometimes his left. The animal fixes its eyes upon the fist which threatens it, follows all its movements, balances its head and body, and thus simulates a kind of dance. Other charmers obtain from the Cobra an alternating and cadenced movement of the neck by the help of sounds which are drawn from a whistle or small flute. It is said that these mysterious jugglers are able, by some sympathetic action they possess, to plunge these dangerous enemies into a sort of lethargy and death-like rigidity, and to bring them at will out of this momentary torpor. It is certain, at any rate, that they handle these animals, whose bite is extremely dangerous, with considerable impunity, and without having in any way neutralized or intercepted the venom. It is supposed by some that these charmers take the precaution of exhausting the venom of the Cobra every day by forcing it to bite something several times before exhibiting it. It is also certain that they more frequently draw the poison fangs—a wound from which can kill in the course of two or three hours.
The Asp (Naja haje) has a less dilatable neck; it is of a greenish colour, and marked with brownish spots. It is smaller than the former; is found in the west and south of Africa; and is especially common in Egypt. It was said to have been this Reptile which caused the death of Cleopatra.
[The genus Hamadryas of Cantor (Ophiophagus of Günther) differs very little from the true Cobras, but has a less developed hood, and a single small tooth placed at some distance behind the fang. The only species, H. elaps, attains to thirteen feet in length, and is proportionately formidable, being much less timid and retiring in its habits than the Cobras of the genus Naja. It preys habitually on other Snakes, and seems to be more plentiful eastward of the Bay of Bengal than it is in India. In Burmah it is styled the Gnán, and Mr. Theobald tells us that its venom is fatal in a few minutes. "One of these Snakes," he adds, "was brought in alive, and a snake-charmer came up to display his command over the animal. At first (as I am told) the Snake seemed cowed by the authoritative 'Hah' of the man; but suddenly, through some carelessness on his part, the Snake struck him on the wrist. The poor fellow at once ran off home to get an antidote, but fell down before reaching his own door, and died in a few minutes. When at Tonghu," continues Mr. Theobald, "I heard a case of an Elephant being killed by one of these Snakes, which I have no reason for doubting. The Elephant was a fine powerful male, and was pulling down with his trunk some creepers or boughs, when a large 'Gnán,' which was disturbed in the tree, struck the Elephant on the trunk between the eyes. The Elephant at once retreated, became faint, and died in about three hours." This terrible Snake would appear to be not uncommon in the Andaman Islands, and its range of distribution extends through the Malay countries to the Philippines and to New Guinea.
The genus Bungarus is so called from the vernacular appellation of Bungarum, which is applied to one of the species on the Coromandel coast. Some of them are very like Cobras without the hood, as the "Kerait" (B. cæruleus), which is a much-dreaded Snake in India, but the geographic range of which extends neither to the countries eastward nor to Ceylon. The Snakes of this genus have a row of broad hexagonal scales along the middle of the back. The Kerait grows to four feet and a half in length, and has the upper parts of a bluish or brownish black, either uniform or more generally marked with numerous narrow white cross-lines, which mostly radiate from a white vertebral spot. In its habits it resembles the Cobra, preying on small Mammalia, Lizards, Toads, and probably other Snakes occasionally. The "Raj-sámp" (literally Lord Snake) is a larger and thicker species than the Kerait, beautifully marked throughout with alternate broad rings of black and golden-yellow. This one is found almost generally throughout the Indian region, and would seem to prey entirely on other Snakes, especially of the Tropidonotus genus. It is of very sluggish habits, and frequents moist places and the vicinity of water. A species, or local variety (B. ceylonicus), takes its place in Ceylon, and there is also a kindred species (B. semifasciatus) in China and Formosa. According to Cantor, the Bungarums are capable of darting nearly the anterior half of the body. Their bite is very dangerous; but "the magnitude of the danger," remarks Dr. Günther, "depends, as in other venemous Snakes, on many circumstances—chiefly on the size and energy of the individual Snake and on the place of the wound. As the fangs of the Bungarums are comparatively short, the wound is always superficial, and can be easily excised and cauterised; also, experiments made on some of the lower animals show that the general effect on the whole system becomes visible only after a lapse of time."
Of poisonous Snakes akin to the Bungarums, there are the Xenurelaps bungaroides, founded on a single specimen received from the Khásya hills (north of Sylhet); and the Megærophis flaviceps, which inhabits the Indo-Chinese and the Malayan countries, but not India. The latter attains to more than six feet in length, and when alive or fresh the head and neck are vivid blood-red, which soon fades to a pale buff hue in specimens immersed in spirit, and hence the faulty name of flaviceps. As many as seven genera—Glyphodon, with two ascertained species; Diemansia, with four; Hoplocephalus, with eight; Pseudechis, with one; Pseudo-naja, with one; Brachysoma, with three; and Vermicalla, with one—are peculiar to Australia with Tasmania, making twenty known species of Colubriform Venemous Snakes in that range of territory, where others doubtless remain to be discovered; and there is one described as Pseudo-elaps superciliaris, which is suspected to be a second species of Pseudo-naja. The Cyrtophis scutatus of South Africa is a sort of hoodless Cobra, without any small teeth behind its fangs. In America there is only the genus Elaps, with numerous species, which are mostly of small size, and in some instances are very brightly coloured, as one of the Coral Snakes[15] of Brazil (E. corallinus), which is beautiful coral-red, with the body encircled by equidistant black rings. The genus Elaps in America is represented in Africa by Homorelaps, in the Indian region by Callophis, and in Australia by Vermicalla. In general, these are small and slender Snakes, too much so to be held in much dread. What Dr. Günther remarks of the species of Callophis will apply, as we believe, equally to the others:—"They appear to prefer hilly countries to the plains, live constantly on the ground, and are slow in their movements. In their habits, in their form, and in their powerless muscular organization, they show the greatest similarity to the Calamariæ; and this is why the Callophides feed almost entirely on the latter, the venemous Snake being able to overpower the non-venemous. Both of these genera have also the same geographical distribution; and Ceylon, where we do not find the Calamariæ, is not inhabited by a single Callophis. If we are allowed to judge from the number of individuals of both genera brought to Europe in collections, the Calamariæ are about twice as numerous as the Callophides." Cantor, who had opportunities of observing them, states that they are generally seen lying motionless, with the body thrown into many irregular folds, but not coiled. Although they are diurnal, their sight, from the minuteness of the pupil, appears to be as defective as their sense of hearing, and they may be closely approached without apparently being aware of danger. He never observed them to strike voluntarily, even when provoked, and he had difficulty in making an adult C. gracilis bite a Fowl; although, of course, the venom of these Snakes is as virulent as that of a Viper, the animals used for the experiments having died in the course of from one to three hours after they had been wounded. Therefore the greatest caution should be observed in catching or handling these Snakes. The shortness of their fangs and the small quantity of their poisonous fluid, however, will always give a very fair chance of recovery if the proper remedies be applied, should an accident occur. Two or three species of this genus inhabit India, and the rest are found in the Indo-Chinese and Malayan countries, one of the most common of them (C. intestinalis) having likewise been received from the Philippines. The C. nigrescens of the mountains of southern India attain to four feet in length, but they are mostly about half of that size, or even smaller.
Lastly, we arrive at