182 THE CANADIAN ENTOMOLOGIST. 



BoisdtivaVs description. — Boisduval has there described the mature 

 larva from the notes of John Abbot as follows : "It is of a yellowish- 

 green, with two broken dorsal lines, a lateral line and eight oblique dashes 

 of a slightly darker green." The figure given bears out the text. The 

 chrysalis, according to this author, is "ferruginous, furnished with little 

 hairs, with two darker longitudinal lines." In the plate it is much too 

 dark to admit of being called ferruginous. It is further stated that "in 

 Georgia this species (larva?) is found, though rarely, on several species of 

 Vacciniiim.'''' 



In comparing the description of the caterpillar with that herewith 

 given, it must be borne in mind that Abbot evidently regarded the lighter 

 tint as the ground colour, the darker areas as markings ; while I have 

 considered the reverse to be the case. 



Larva at birth. — Easily distinguished from new-born nip/ion hy the 

 inconspicuousness of the short, nearly straight, backward-directed bristles 

 of the laterodorsal series, which in nip/ion are black. Body pale yellow, 

 hairs colourless, laterodorsal bristles a little dusky. Spiracles and dorsal 

 shield pale yellowish-brown. Head yellowish, with a brown labrum and 

 black ocellar fields. Length, 1.26 mm. Exact duration of the first stage 

 not determined accurately, certainly something less than three days. 



Second stage. — Body relatively broader, light green ; substigmatal 

 fold more pronounced ; hairs relatively shorter, more numerous, buff or 

 light brown ; head yellow-green. Otherwise, as in previous stage. The 

 larvae which have been feeding upon pollen are dull orange or brownish, 

 those which have eaten the white carina are very pale green. By giving 

 them only the pistil and stamens for food they regain the usual colour. 

 From 7 to 10 days after birth the caterpillar comes out of the flower and 

 spins a silken mat. Upon this it may remain as much as two days before 

 the skin is cast. 



Penultimate stage. — Length just after the second moult, at rest, 3.7 

 mm.; extended, 4.1 mm. Head brilliant green to dirty yellow-green. 

 Spiracles and dorsal shield a little browner than before. General colour 

 pale green, nearer the violet end of the spectrum than the green of the 

 preceding stage, marked with a weaker tint of the same colour as follows : 

 A slender mediodorsal line extending from the posterior edge of the third 

 thoracic to the anterior edge of the eighth abdominal segment. On either 

 side of this and separated from it by a narrow line of green more dusky 

 than on any other part of the body, a rather broad stripe interrupted by 



