Of the various orders of insects, Hemiptera (earwigs, field-bugs, etc..), Orthoptera (cockroaches, grasshoppers, locusts, etc..), Diptera (flies, etc..), Neuroptera (dragon flies, May flies, Ac.), Lepidoptera (butterflies and moths), Coleoptera (beetles), and Hymenoptera (bees, wasps, and Ichneumon-flies, etc..), the Lepidoptera and Coleoptera will find most favour in his eyes, owing to their brilliancy of colouring, variety of shape and size, and easiness of manipulation.
It must be remembered, however, that insects should be collected with a definite purpose by the taxidermist, and not merely for pastime, or he will degenerate into that most Odious of all created beings — a collector for the sake of collecting, or what used to be called an "exterminator." Indeed, I have known of a case in which over 1600 of the males of a certain species were caught in one day, "assembled" by the attractions of seven or eight females. These figures seem incredible, but for the fact that I myself saw part of the spoil displayed on a 12 ft. board.
Need I say that such slaughter as this is far beyond the bounds of fair collecting, and that such courses, persevered in, give the odious title of "exterminators" to all those who practise it. In this particular instance the moths were made up into "pictures," which, though ornamental perhaps for a workman's home, hardly justify the slaughter of any but the very commonest or harmful species.
The tortoiseshell, peacock, and admiral butterflies are often bred in hundreds for the purpose of making a "picture" of a snake strangling a tiger, or a crown, or the wings are cut by punches to form the petals of flowers, to be afterwards grouped under shades. All these things, though very curious, and really striking if well done, are steps in the wrong direction, and on a par with the use of humming and other birds for ladies' hats — all of which adaptations of natural history objects to commerce inexpressibly "worry" anyone with the slightest taste or feeling.
If a really beautiful object is wanted, in order to show a group of exotic or other insects as specimens, out of a cabinet, you may mount them in as natural a manner as possible on grasses or fine twigs, made as directed, setting them off with a few foreign ferns, and inclosing the whole in a "mount," to hang up, or in a narrow oval shade with carved oak or other stand; or they may be scientifically and artistically mounted, to show the life-history of any one species, by arranging the larvae feeding on a properly modelled representation of its natural food-plant, the imagines, male and female, with some few striking varieties, shown at rest or flying, as also the eggs and the pupa-case, with a description of their economy affixed. A few specimens of families or genera of insects shown thus is, to my mind, of far greater importance, especially to museums, than mere "collectors" are aware of.
Many works have been written on the collecting and preserving of these orders, and especially of the Lepidoptera, vide Dr. Guard Knagg's work on "Collecting Lepidoptera," Rev. Joseph Greene's "Insect Hunter's Companion," and many others, including a little work on "Collecting Butterflies and Moths" by myself.
Cruelty has been advanced as a crime specially to be laid to the charge of the student in entomology; but some of the greatest workers in that science have been ladies and clergymen, as also laymen of the most humane and advanced scientific principles. A vast amount of ignorant ideas, carefully nursed, are used as weapons against the entomologist — the pet one of which is, that impalement of a living insect through the head constitutes the sole aim and end of the collector.
The fact is curiously inverse of this, for not only are insects captured for purposes of study, but they are never impaled alive but by a very ignorant or careless person. The lepidoptera (butterflies especially) are very easy to kill, the simplest plan being to press the thorax underneath the wing with the finger and thumb, which instantly causes death. This is now superseded by the cyanide bottle, of which anon.
It is singular how many people there are, even in the middle class, who fail to recognise the fact that the egg (ovum) produces the caterpillar or "grub" (larva), which, after a due season of preparation, produces the chrysalis (pupa), which latter, lying quiescent for a variable period, either in the ground or in other situations favourable for its development, changes the last time to the perfect insect (imago). This latter, if a butterfly or moth, does not, as some people imagine, grow, but after it has unfolded its wings on emergence to their full extent, it never becomes either larger or smaller.
An insect, especially a butterfly, when seen by a youngster, is usually chased in the most reckless fashion — jacket and cap, and even sticks and stones, are pressed into the service, and the unfortunate insect is usually a wreck before its fortunate (?) captor falls on top of it.