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It will be easily understood how in this manner all the intermediate steps less favoured in the development of the olfactory filaments or of the chelae would disappear from the lists, and two sharply defined forms, the best smellers and the best claspers, would remain as the sole adversaries.
The males had claspers covered with small red-wine feathers tan tipped. The thorax was cream-coloured below and the under side of the abdomen red wine crossed with cream-coloured lines at each segment. The front wings had the usual long, silky hairs. They were of olive-green shading into red, at the base, the costa was red, and an escalloped band of red bordered them.
This distinguished naturalist, therefore, like so many other Frenchmen, has not taken the trouble to understand even the first principles of sexual selection. An English naturalist insists that the claspers of certain male animals could not have been developed through the choice of the female!
These accessory sex-serving traits undoubtedly survived because of their usefulness in external adornment for attracting attention in courtship, in the metabolic requirements of sex combat and the sex act, and in the necessities of caring for the young, until well-grown. The rooster's comb and spurs, the male frog's claspers, the stag's antlers, and so on, are familiarly and obviously so useful.
Salvin, O., inheritance of mutilated feathers; on the Humming-birds; on the numerical proportion of the sexes in Humming-birds; on Chamaepetes and Penelope; on Selasphorus platycercus; Pipra deliciosa; on Chasmorhynchus. Samoa Islands, beardlessness of the natives of. Sandhoppers, claspers of male. Sand-skipper.
A white stripe ran down each side of the abdomen, touched with a dot of brownish red wine colour on the rings. The under part was pinkish wine crossed with a narrow white line at each segment. The claspers were prominent and sharp.
It was thickly covered with long hair, and faintly lined at the segments with yellow. The claspers were very sharp, prominent brown hooks. His sides were dotted with alternating red and orangebrown spots, and his thorax beneath, yellow. The under side of the abdomen was yellow, strongly shaded with orange-brown. His legs and feet were the same.
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.
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