STYGIA. 139 



from two inches and three-quarters to three inches and a 



half. 



The antennae are pale grey, with black pectinations. The 

 head and collar are pale grey, the latter bordered with yellow. 

 The thorax is brownish-grey, varied behind with whitish, 

 bordered with a curved black transverse stripe. The abdomen 

 is ashy grey, ringed with pale grey. 



The fore- wings are grey, clouded with dark brown, and 

 traversed by a network of waved dark transverse hnes, two 

 transverse stripes towards the hind margin being broader and 

 more conspicuous than the others. The hind-wings are dark 

 grey, and resemble the fore-wings, but are only slightly reticu- 

 lated. On the under side the fore-wings are brown, and the 

 hind-wings pale grey ; otherwise they are nearly as above. 



The larva feeds in the trunks and bark of willow, alder, 

 poplar, oak, lime, elm, chestnut, apple, pear, and other trees, 

 requiring three years to attain maturity. The head is 

 black, the second segment yellow, with a large black dorsal 

 mark, and the rest of the back shining dark red, appearing as 

 if polished. The sides are yellow. It emits a very disagree- 

 able smell, which has led to the insect being called the Goat 



Moth. 



The pupa is reddish-brown, striped with yellow on the 

 abdomen, which is provided with short bristles on each seg- 

 ment. The cocoon is covered with particles of wood, and is 

 lined with very tough silk. 



The moth appears in June and July. 



GENUS STYGTA. 

 Stygia, Latreille, Nouv. Diet. d'Hist. Nat. xxi., p. 262 (1803); 

 \xiv., p. 185 (1804); Godart, Lepid. France, iii., p. 167 

 (1821); Walker, List Lepid. Lis. Brit. Mus., viii., p. 2 

 (1856.) 



