MODIFICATION OF THE HEAD. 



767 



the rest black. In the legs, the thighs are very strong and 

 thick, thus giving rise to 

 the generic name Rhopa- 

 lomera, or " club-thighed." 

 They are covered with 

 hair, and are black, except 

 the knees, which are yel- 

 low. The wings are grey 

 clouded with brown. The 

 insect is a native of Brazil. 



No one who was unac- 

 quainted with the subject 

 would think that the two 

 insects which are next 

 represented are but the 

 male and female of the 

 same species. Yet this is the case, the insect being one of a 

 small group in which the males are distinguished by some 

 extraordinary appendages to the head, while the females have 

 nothing remarkable about them. 



Fig 513.— Rhopalomera tibialis. 

 (Chestnut and black.) 



-l-$£e!-r=i~~ 



Male. 



Fig. 514. — Achias longividens. 



(Purple, blue, and grey.) 



Female. 



In the first of these insects, the head of the male is developed 

 sideways into two long and nearly straight projections, at the 

 end of which are placed the eyes. The whole shape of the head 



