20 TRICHIOSOMA VITELLIN^l. 



the thorax and abdomen is usually more reddish or 

 yellowish in tint compared to the ? . The middle of 

 the antennae is generally testaceous ; seldom is it 

 entirely black. 



This is the largest species in the genus, although 

 very small specimens are also met with. As a rule, the 

 reddish colour of the sides, apex, and lower side of the 

 abdomen readily separates it from lucorum, but as 

 this is not a constant character, and as the same colour 

 occurs with lucorum, the most reliable point of dis- 

 tinction lies in the abdomen of vitellince being much 

 more shining and bronzy than that of lucorum, besides 

 which the hair on the middle and apex is much shorter, 

 the colour of the hair on the thorax and abdomen 

 having also a redder tinge. 



The larva has the head white, with a fuscous mark 

 on the apex, not touching the black eye-spots ; the 

 lower part of the clypeus is black in the centre. The 

 body is light green, the folds of the skin whitish; 

 along each side of the dorsal vessel is a row of white 

 tubercles, and there is another row over the legs ; the 

 dorsal vessel itself is pale green. The spiracles are 

 dark reddish, and over each is one or more small reddish 

 marks. The anal segment is clear of tubercles. Legs 

 clear white, claws blackish. 



The above is the description of the larvae I find in 

 Scotland feeding in .August and September on Salix 

 aurita and 8. caprea. Brischke (1. c.) bred the species 

 from two different larvas. One he found in August 

 and September on Salix caprea. Its body was clear 

 yellowish -green beset with numerous white tubercles; 

 the head shining, yellowish, granular in texture, and 

 with black-eye spots ; the spiracles elliptical, reddish, 

 the claws brown. The other form he found in July on 

 Salix viminalis and S. caprea, and was smaller than the 

 autumnal one. The ground colour was bluish-green, 

 the dorsal line (which was free from white warts) of a 

 darker green, and the whole body (except the last seg- 

 ment) beset with raised, often confluent, tubercles and 



