64 Studies on Life-history of Bomhycine Moths. 



Stage III. — Molted the second time June 10th. Lenijth 11 mm. 

 Now the pair of protJtoracic black pencils formed of feathered 

 hairs, and a short thick dorsal one on the 8th abdominal segment have 

 appeared. Two snow-white dorsal tufts, one on the Sd'and a much 

 smaller one on the 4th abdominal segment are now present. The 

 dorsal and subdorsal warts on the abdominal segments are now 

 bright rust-red, and very conspicuous. The body is jet-black, and 

 there are no lateral tufts. The white hairs on the sides of the body 

 are longer and more numerous and dense than before. The generic 

 characters are nearly all assumed at this stage, as in the other 

 species. 



Stage IV. — June ISth-lYth, molted again. Length, without the 

 pencils, 15 mm. The head is still black, with a whitish labruni. 

 There are two long black prothoracic pencils of feathered hairs, and 

 a single median dorsal one on the 8th abdominal segment. Two 

 brown-black tufts on abdominal segments 1, 2, each, succeeded by 

 a white dorsal tuft on the 3d, and one on the 4th segment. The 

 piliferous warts are now brighter red. Most of the hairs are white. 

 The yellow patches on the thoracic and on the 5th abdominal seg- 

 ments are distinct. It is now a gaily marked caterpillar. 



Last stage. — (July 12th.) Length 18-20 mm. The head is 

 entirely black, except the labrum, which is yellow. The body is 

 black, with faint yellowish patches along the sides, but along the 

 back deep velvety black. A pair of stout prothoracic pencils. No 

 lateral pencils ; a thick medio-dorsal oblique black pencil. The head 

 is partly concealed from above by a thin broad sheet of white hairs 

 arching over from the prothoracic segment. There are 4 thick short 

 dorsal black tufts of the usual wedge-shaped form, the outer hairs 

 on the base being white, though the 2 anterior tufts are in one 

 example tawny, and in the centre black, while the two posterior 

 tufts are white, the central hairs being somewhat buff-colored. The 

 piliferous warts are bright brick-red, but not of so bright a coral- 

 red hue as the two dorsal eversible glands. The hairs arising from 

 the piliferous warts are white, with scattered black ones, all, as 

 usual, radiating, and of different lengths. There is a brown and 

 yellow dor.sal spot and two unequal subdorsal ones on each side of 

 abdominal segments 4 to 7. There are four flattened broad dorsal 

 piliferous warts on the front edge of the prothoracic segment, and 

 which are reddish-yellow behind. A pair of yellow dorsal spots 

 on the front edge of the metathoracic segment. A broken yellow 



