STATES OF INSECTS. (Jmago.) 307 
nearly cylindrical in shape, and very narrow; while the 
other sex are oblong or ovate, especially their abdomen: 
and in Andrena the former are much slenderer than the 
females, and of amore lanceolate shape. But a still 
more striking difference in this respect between the 
sexes is exhibited by some species of the genus Pinus, 
in which the male is long and slender, and the female 
short and thick. This, in more than one instance, has 
occasioned them to be mistaken for distinct insects: thus, 
P. Lichenum and P. similis, P. ovatus and P. testaceus, 
of Mr. Marsham, are mere sexual varieties. But the 
most entire abalienation of shape at present known, is 
that which distinguishes the male from the female Coc- 
cus; these are so completely dissimilar as scarcely to 
have any part in common. In Psyche vestita, and others 
of the same family, while the males are of the ordinary 
conformation of the order, the females are without even 
the slightest rudiments of wings; they have no antenne, 
the legs are extremely short, not longer than those of 
the caterpillar; and the body is entirely destitute of 
scales, so that they altogether assume the exact appear- 
ance of hexapod larvee?. A conformation nearly similar 
takes place in the female of Diurnea Lichenella ; but in 
this the feet are longer, and the anus is furnished witha 
long retractile ovipositor °. 
iv. In many cases, the structure of particular parts and 
organs of the body differs in the sexes. As the facts 
connected with this part of our present subject are ex- 
tremely numerous and various, it will be convenient to 
* Scheven Naturfors. stk. xx. 65. ¢. ii. f. 4. Compare Jéid. x. 101. 
> Reaum. iii. ¢, xv. f. 18, 19. 
Ke 
