SESIID^. 91 



orange-yellow, nervures blackish, cross-bar and apical blotch 

 orange-yellow, but with the nervures visibly black and divid- 

 ing them, in the female broadly so ; cilia coppery-black. 

 Palpi silvery, thorax black beneath, tinged in front with 

 silvery, and with a brilliant orange blotch on each side ; 

 abdomen beneath blackish, with a long yellow patch in the 

 male, but with no indication of the red belt of the upper 

 side ; in the female blue-black, and showing the red belt ; 

 anal tuft, beneath, yellowish in the male, blue-black in the 

 female; legs black, except the tarsi, which are yellowish - 

 white, clouded with black. 



This species is liable to considerable variation in the colour 

 of the abdominal belt, from vermilion to orange-red, orange, 

 and even yellow. 



On the wing in June, July, and August. 



Larva three-fourths of an inch long, of even thickness, 

 rather flattened ; head rounded ; second segment slightly 

 broad ; skin wrinkled, with the horny spots slight^ raised, 

 and each bearing a bristle ; segments rather inclined to over- 

 lap. Head red-brown, dorsal plate large, partly covering the 

 third segment, tinged with bright brown ; body dirty white, 

 with pinkish pulsating dorsal vessel, and the fifth to eighth 

 segments tinged with purplish-pink; pro-legs hardly visible. 

 (Hellins.) 



August to June, in trunks and branches of apple trees, 

 feeding on the inner bark ; but it may feed during two years. 



Pupa long, slender, cylindrical, but tapering at the tail, 

 which is blunt, and has a circlet of small spines. Abdominal 

 segments with two rows, or, in case of the hinder, with one 

 row of dorsal points. Glossy light brown, with darker brown 

 wing-cases ; head and rows of points still darker brown. In 

 a chamber in the rough bark of apple trees, forcing its way 

 partly through the skin of the bark when ready to produce 

 the perfect insect. 



