The fact is, that moths smell like other moths of the same species, and within a reasonable radius they undoubtedly attract each other.  In the same manner birds carry a birdlike odour, and snakes, frogs, fish, bees, and all animals have a scent peculiar to themselves.  No dog mistakes the odour of a cat for that of another dog.  A cow does not follow the scent of horses to find other cattle.  No moth hunts a dragon-fly, a butterfly, or in my experience, even a moth of another species in its search for a mate.  How male moths work the miracles I have seen them accomplish in locating females, I cannot explain.  As the result of acts we see them perform, we credit some forms of life with much keener scent than others, and many with having the power more highly developed than people.  The only standard by which we can determine the effect that the odour of one insect, bird, or animal has upon another is by the effect it has upon us.  That a male moth can smell a female a block away, against the wind, when I can detect only a faint musky odour within a foot of her, I do not credit.

Primarily the business of moths is to meet, mate, and deposit eggs that will produce more moths.  This is all of life with those that do not take food.  That they add the completing touch and most beautiful form of life to a few exquisite May and June nights is their extra good fortune, not any part of the affair of living.  With moths that feed and live after reproduction, mating and egg placing comes first.  In all cases the rule is much, the same.  The moths emerge, dry their wings, and reach full development the first day.  In freedom, the females being weighted with eggs seldom attempt to fly.  They remain where they are, thrust out the egg placer from the last ring of the abdomen and wait.  By ten o’clock the males, in such numbers as to amaze a watcher, find them and remain until almost morning.  Broad antennae, slenderer abdomen, and the claspers used in holding the female in mating, smaller wings and more brilliant markings are the signs by which the male can be told in most cases.  In several of the Attacine group, notably Promethea, the male and female differ widely in markings and colour.  Among the other non-feeders the difference is slight.  The male Regalis has the longest, most gracefully curved abdomen and the most prominent claspers of any moth I ever examined; but the antennae are so delicate and closely pressed against the face most of the time as to be concealed until especially examined.  I have noticed that among the moths bearing large, outstanding antennae, the claspers are less prominent than with those having small, inconspicuous head parts.  A fine pair of antennae, carried forward as by a big, fully developed Cecropia, are as ornamental to the moth as splendidly branching antlers are to the head of a deer.