THE CANADIAN ENTOMOLOGIST 275 



minal segments. Prothoracic plate black with about eight long 

 setae projecting forward; tubercles large, shiny black, the dorsal 

 thoracic tubercles with about 3 long seta' and the abdominal ones 

 with about six; all the lateral tubercles bear single, black setae, 

 tubercle IV being small with very minute seta. Length 2 mm. 



Staoe II. — Head shiny black. Body white with abdominal 

 segments I, IV, V and VIII deep black brown as before, at times 

 shaded dorsally with yellowish; a lateral brown band with the 

 upper edge situated on a level with tubercle III, slightly mottled 

 with white, and with the tubercles contained in this band ringed 

 with white basally; this white area around tubercle V tends to 

 spread laterally forming a more or less consecutive white sub- 

 spiracular line. On the flange in some cases is a brown dorsal 

 band with central white line, in other cases this band is lacking 

 and the general colour appears in consequence lighter. Tubercles 

 shiny black, large, except IV, situated immediately posterior to 

 the spiracle, which is minute with a single seta; the number of 

 setae have greatly increased, tubercle I bearing about 12 stiff 

 black bristles and the other tubercles 6-8 similar ones. Length 

 4 mm. 



Stage III. — Head black. Body largely deep black-brown, 

 abdominal segments I, IV, V and VIII entirely so, the other 

 segments with an orange-yellow subdorsal stripe occupying the 

 area between the lower portion of tubercle I and the upper portion 

 of tubercle III; some specimens show a slight white marbling 

 both laterally and dorsally on the dark ground colour. Lateral 

 tubercles strongly ringed with white, forming, as in previous stage, 

 a broken subspiracular line on a level with tubercle V; on the 

 dark segments tubercle II is also white ringed and at times tubercle 

 I shows traces of white at the base; tubercles as before, the dorsal 

 ones with numerous black stiff bristles and a few slight white ones 

 around the bases, the lateral ones with several central black setae 

 and numerous white ones; from the prothoracic shield numerous 

 white hairs overhang the head. The segmental incisions are well 

 marked, abdominal segments I and VIII being noticeably humped. 

 Length 9 mm. 



Stage IV. — A considerable change in the general appearance. 

 Head black Body black with orange subdorsal line on the seg- 



