STATES OF INSECTS. 333 



chanter terminates in a long mucro or spine a , and in the 

 other it is rounded at the apex. 



Peculiar characters in their thighs also often indicate 



o 



different sexes. In Primus damicornis there is a short 

 spine at the apex of the anterior ones in the female that 

 is not in the male ; while in Macropus longimanus, at their 

 base externally the male is armed with a mucro, which I 

 cannot find in the female b . In Scarabmcs longimanus L. 

 this thigh is furnished with two teeth c . — The interme- 

 diate thighs also sometimes differ. In an Onitis from 

 China, a variety perhaps of O. Sphinx, 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 Betulce, 

 and also in many species of Cimbex F., a kind of saw-fly ; 

 and the same circumstance distinguishes the latter sex in 

 many species of Lygceus F., a kind of bug : I discovered 

 this from L. cruciger, of which I have both the sexes ; and 

 from Stoll's figure of L. Pharaonis d . In some of these 

 the female thighs are enormously large. A remarkable 

 variation in this respect is observable in the coleopterous 

 genus (Edemera (Necydalis L.). In CE. Podagrarice these 

 limbs are incrassated in one sex and not in the other e ; 

 in CE. carulea they are so in both sexes; and in CE. ceram- 



a Clairv. Ent. Helv. ii. t. xii./. B. 



b Oliv. Ins. no. 66. t. hi. iv./. 12. c Ibid. no. 3. t. iv.f. 27. 



d Punaiscs, t. m.f. 20. 



e Mr. Marsham has made two species of this from this circum- 

 stance, viz. Necydalis Podagrarice and simplex. 



