HETEROGENEA. 227 



Heterogenea asella, Stephens, 111. Brit. Ent. Haust. ii. p. 85, pi. 



17, fig. 2 (1829); Barrett, Lepid. Brit. Isl. ii. p. 172 



pi. 64. figs. 3, 3^, b (1894).- 

 Heierogenea (2^^//(^;^(i!,Treitschke, Schmett. Eur. viii. p. 18 (1830). 

 Heterogenea asellus, Kirby, Eur. Butterflies and Moths, p. 114 



(1879); Buckler, Larvae of Brit. Lepid. iii p. 73, pi. 53, 



fig. 8 (1889). 



The Triangle Moth is found throughout the greater part of 

 Europe. 



It expands about ^ inch. 



The body and fore-wings are yellowish-brown in the male, 

 more or less tinged with darker, and the hind-wings are 

 blackish, with yellowish borders. 



The female, which is often distinctly larger than the male, is 

 ochre-yellow. 



Male. Female. 



The Triangle Moth. 



The Moth rests with the wings partly arched, and the abdo- 

 men raised. 



The larva is short and stout, with the back flat and the sides 

 somewhat depressed. It has a very small head. The whole 

 of the upper surface of the body is rough like shagreen, and 

 of a delicate green colour, with a broad olive-brown dorsal 

 mark commencing on the third segment, narrowing somewhat 

 on the fifth, becoming very wide on the seventh and eighth, 

 and narrowing again till the end of the body is reached. 



It usually remains upon one leaf, and does not leave it until 

 it is quite consumed. When feeding, it retracts the head under 

 the second segment, so that it is concealed. 



Q 2 



