SINGULAR STRUCTURE OF THE ABDOMEN. 



723 



ingly brilliant even in the dried specimen, but in the living 

 insect must even be more vivid. 



The larva is coloured very much like a harlequin, the whole 

 of the creature being alternately red and' scarlet, with the ex- 

 ception of the undeveloped elytra and the spots along the back, 

 which are bright yellow. 



Another species of the same genus is here given. This is a 

 native of Orizaba. 



Without being so gorgeously coloured as its relative, it is a 

 very handsome insect, and is remarkable for some peculiarity 



Fio. 46a.— Pachylis acutangulus. 



(Black, urange, and purple.) 



of form. The flat plate on the antenna? is half yellow and half 

 black. The thorax is dark brown, and the wings are black 

 traversed with orange lines. Towards the tips they become 

 olive green with lines of metallic coppery red. The males have 

 the thighs of the hind legs very much thickened and armed 

 with sharp spikes. The most characteristic point in this insect 

 is, however, the structure of the abdomen, which is much flat- 

 tened, and has each segment developed into a sharp point, as is 

 indicated by the specific name, which signifies something which 

 has sharp angles. 



:; a 



