276 THE CANADIAN ENTOMOLOGIST 



ments corresponding to the pale segments of the previous stages 

 and a whitish subspiraciilar line as before; tubercles large, black, 

 prominently white-ringed; spiracle ringed with white. On the 

 first four segments the dorsal hairs are red-brown paling to white 

 laterally, the red-brown colour occasionally extending over to 

 abdominal segments II and III, on the other segments all the hairs 

 are white with the exception of a few black hairs on the 8th abdo- 

 minal segment which is markedly humped; several long white 

 hairs arise from the lateral tubercles, these being pointed forwards 

 on the anterior segments and backwards on the anal segments. 

 Length 12 mm. 



Stage y.— Head black. Body velvety black; all trace of the 

 orange subdorsal stripe is lost and the white subspiracular line 

 and rings round the tubercles greatly reduced, when present 

 the former being orange-tinged. Hairs whitish-yellow except on 

 the meso- and metathoracic and 1st abdominal segments where 

 the whole area above the spiracle shows red-brcwn hairs which 

 often extend dorsally on to the 2nd and 3rd abdominal segments; 

 occasionally similar hairs are found dorsally on the 8th abdominal 

 segment which scarcely ever shows any black setae as in previous 

 stage; the tubercles from which these reddish hairs arise are slightly 

 tinged with red-brown and the other tubercles are mostly black 

 occasionally tinged with whitish. Spiracle white. 



Width of head 1.8 mm. Length 18 mm. 



Stage VI (full grown).— Very much as in preceding stage, 

 quite variable in coloration. Head black. Body velvety black 

 with white spiracles and with reddish, subspiracular line either 

 slightly present or entirely lacking or confined to the base of 

 tubercle V. Hairs ranging in colour from pure white to yellowish, 

 the dorsal hairs being usually rather stunted and crinkly; red- 

 brown hairing as in preceding stage on the anterior segments 

 except prothorax and extending dorsally to 2nd and 3rd abdominal 

 segments and frequently with similar hairs dorsally on 8th and 

 9th abdominal segments; the tubercles bearing the red-brown 

 hairs are usually themselves similarly coloured, whilst the other.-^ 

 may be black shaded with white or entirely white and frequently 

 the lateral abdominal ones are entirely black. Length 25-30 mm. 



Mailed August 14, 1915. 



