There are many other sizes, but these will be found quite sufficient for the beginner. These pins are also gilt, under the impression that gilding tends to prevent the corrosion of verdigris which the juices from the bodies of some moths, the Hepialidae especially, induce. This is not so; the Continental black varnished pins are better safeguards, but prejudice forbids their use. Messrs. Tayler now make all their sizes in "enamelled black" to order, at the same prices as their gilded ones.
Varnishing the common entomological pins with a hard and nearly colourless varnish has been tried with good effect, though it is a trial of patience to do this to pins one by one. Really the only thing to stop grease appearing in the bodies of moths, to the subsequent breaking of your pins and soiling of your cabinet paper or velvet, is to open all the insects underneath, take out all their internal organs, carefully paint the inside with a little of the corrosive sublimate preparation (see Chapter IV), and fill up the void with cotton wool. Unfortunately the evil of greasy exudations from the bodies of unstuffed or low-set insects does not stop at the corrosion of the pins or greasing of the paper, but in many cases extends to the underlying cork, which is sometimes so badly greased as to necessitate the cutting out of the damaged patch to prevent the grease reappearing when the drawer is newly papered.
GREASE AND MITES. — "Grease" and "mites" are in fact the bêtes noires of the entomological collector. When you have an insect, therefore, old and greasy, but yet "too fondly dear" to throw in the fire, place the offender on a piece of cork weighted at the bottom with lead and sink it bodily in a wide-mouthed bottle, partly full of benzoline; leave it there from a day to a week, according to its state. When it comes out it will look even worse than before, but after being covered up with a layer of powdered chalk, magnesia, or plaster of Paris, it will often come out as good as new.
I say often, for cases occur now and then in which no amount of pains restores the insect to its pristine freshness; but these exceptions are few and far between. "Mitey" insects are cured in a similar manner; in fact, I would advise that all exchanges be submitted to the benzoline test. I have also used Waterton's solution (see chapter IV) to plunge them in, though 6 gr. of corrosive sublimate to the ounce of alcohol are about the proportions of the bath for most insects; but the spirit may be increased, if, on trial with a common insect or black feather, it should be found that the mercury is deposited as a white stain on the evaporation of the spirit.
Rectified aether (pure) is a better medium than alcohol for rapidity of drying (especially in a draught), but is more expensive. Nothing, I believe, prevents mites (psocidae) appearing now and then even in poisoned insects. Constant care, stuffed bodies, and soaking in benzoline, are the deterrent agents; camphor is a pleasant fiction, so is wool soaked in creosote, phenic acid, cajeput oil, crystals of napthelin, etc.. — in fact, it may be laid down as an indisputable doctrine that no atmospheric poison is of the slightest avail against mites. [Footnote: See remarks on this in chapter IV.] Get them to eat poison, or drown them and shrivel them up in spirit and you may settle them, but not otherwise.
I have heard of cabinet drawers suffered to remain upside down to prevent mites getting to the insects; but I very much fear that such a plan as this, is on all fours with that of a man whom I knew, who, being abroad in a "Norfolk-Howard" infested country, turned the head of his bed every other night to puzzle the enemy!
The late Mr. Doubleday, the father of English entomology, never admitted camphor in his cabinet (thinking, as I do, that it conduces to grease), but used the corrosive sublimate preparation instead, to touch the underneath of the bodies of doubtful strangers. Loose quicksilver or insect powder is by some strewn amongst their insects; but the danger of the first to the pins, and the untidy appearance of the second, militate against their general use. [Footnote: It is quite true that, although camphor evaporates rapidly, and settles on anything, so as to be perceptible even to the naked eye, yet that it re-evaporates and ultimately disappears. This, to my mind, is the most fatal objection to its use: its ready evaporation leaving the insects etc.., ultimately without any protection.]
HAUNTS. — Having given a brief outline of the capture, setting and storing of an ordinary insect, I will, in as few words as possible, give a short history of any peculiarities attending the capture of extraordinary insects.
Some butterflies and moths (the autumnal appearing species) live through all the winter hid up in hollow trees, outhouses, etc.., appearing at the first rays of the spring sun to lay their eggs and die. Others pass through the frost and snow as pupae, bursting their cerements in the sunshine, to live their brief life and perpetuate their race; others eke out a half dormant existence as minute larvae, others pass the winter in the egg state. In fact, each species has its idiosyncrasy. [Footnote: Here, perhaps, I may explode that myth and "enormous gooseberry" of the mild winter or early spring, headed in the newspaper every year as "Extraordinary Mildness of the Season": "We are credibly informed that, owing to the mildness of the past week, Mr. William Smith, of Dulltown, Blankshire, captured a splendid specimen of a butterfly, which a scientific gentleman to whom it was sent pronounced to be the small tortoiseshell Vanessa, etc.." Now the fact is, that Urticae merely came out for an airing, awakened from its winter sleep by the extraordinary warmth of the day, and it might just as likely have been "shook up" on the preceding Guy Faux or Christmas-day; all the Vanessidae, and many others, being hybernators. Far different, however, is it when any of the "Whites" — Pieridae — are seen or caught. They indeed do herald the coming spring, as, lying in the chrysalis state throughout the autumn and following winter, some degree of continuous warmth must take place 'ere they can emerge.]
The swallow-tail butterfly, first on some British lists, must be sought for in the fens of Norfolk, and Cambridgeshire, and Northamptonshire. It is a strong flyer, and requires running down, unless when settled on the head of one of the various umbelliferous plants it delights in. The clouded yellow is usually a lover of the sea-coast during the months of August and September — though in that year of strange climatic changes (1877) it appeared in considerable numbers from the beginning of June, whether hybernated, or an early brood evolved from pupae lying dormant throughout the last summer, is an open question.