332 STATES OF INSECTS. (Jmago.) 
the beetles called black dors, in one sex the same tro- 
chanter terminates in a long mucro or spine?, and in 
the other it is rounded at the apex. 
Peculiar characters in their thighs also often indicate 
different sexes. In Prionus damicornis there is a short 
spine at the apex of the anterior ones in the female that 
is not in the male; while in Acrocinus longimanus, at their 
base externally the male is armed with a mucro, which I 
cannot find in the female®. In Scarabeus longimanus L. 
this thigh is furnished with two teeth *«.—The interme- 
diate thighs also sometimes differ. In an Onztis from 
China, a variety perhaps of O. Sphinz, those in the male 
are dolabriform, and in the other sex of the ordinary 
shape. In Odynerus spinipes they have on their lower 
side two sinuses, so as to give them the appearance of 
being toothed. ‘The posterior thighs are sometimes in- 
crassated in the male, and not in the female. This you 
will see in a weevil, not uncommon, Apoderus Betula, 
and also in many species of Cimbex, a kind of saw-fly ; 
and the same circumstance distinguishes the latter sex in 
many species of Lyg@us, akind of bug: I discovered 
this from LZ. cruciger, of which I have both the sexes ; and 
from Stoll’s figure of Z. Pharaonis*. In some of these 
the female thighs are enormously large. A remarkable 
variation in this respect is observable in the coleopterous 
genus Gidemera. In Gi. Podagrarie these limbs are in- 
crassated in one sex and not in the other °; in @. cerulea 
they are so in both sexes; and in (. ceramboides in 
* Clairv. Ent. Helv. i. t. xii. f. B. 
> Oliv. Ins. no. 66. ¢. ili. iv. f. 12. * Ibid. no. 3, ¢. iv. f. 27. 
@ Punaises, t. ii. f. 20. 
e Mr. Marsham has made two species of this from this circum- 
stance, viz. Necydalis Podagrarie and simplex. 
