Packard.] loO [March 17, 



no longer. The color of the head and body are the same, being dull 

 black, the head somewhat polished. The hairs are white, uneven in 

 lengtii, and, as in C. nmericana, a few are yellowish gray. Tiie pilifer- 

 ous warts are distinct and rough. There is oa each side of the median 

 line of the body a row of about seven small but distinct, transverse, snuff- 

 yellow dorsal spots, beginning on the first abdominal and ending on the 

 seventh segment, there being more to be seen on the thoracic segments ; 

 they almost form a transverse linear spot, but are interrupted on the 

 median line, though often continuous on the hinder edge of the segment, 

 yet sometimes they are separate and the spots are narrowly triangular, 

 the apices pointing outward away from the median line of the body. 



Stage (?). — Length, 25 mm. The distinctive marks of this stage is the 

 row of lateral, black, elongated spots, sometimes broken into two portions, 

 and then resembling a short, thick exclamation mark. There is a difiuse, 

 irregular, double black-brown dorsal band, enclosing on each segment an 

 irregular, elongated, pale blue dash, which is more or less spindle-shaped, 

 and ending in a point before reaching each suture. The clear, pale-blue 

 sides of the body are also speckled with fine black dots. 



Also in the last (!) stage the short, irregular, sienna or deep ochreous 

 brown lines in the dorsal black bands become obsolete. 



It ditters from the eastern (J. sylvatica in the dorsal median spots being 

 pale blue ; in the obsolete, ochreous, lateral lines, and in the much 

 larger, lateral dark spots, while the entire side of each segment is pale 

 blue, not gray below. 



C. calijornica is in a more advanced larval stage than (7. sylvatica, and 

 should stand above it, the lateral black line disappearing, being broken 

 up into spots, and the dorsal ochre lines being obsolete. It is thus a 

 more specialized form. The larvae eat sparingly on willow and aspen, 

 living until July 15. 



I received a bunch of eggs from Mr. Ricksecker, of Santa Clara, Cali- 

 fornia, April 7. Some of the larvae hatched on the journey east ; they 

 seemed unable to eat their way out. I assisted one by removing the un- 

 eaten rim, and as it came out the hairs were still moist and lay along the 

 back; several (those arising from one wart) stuck together before it was 

 able to extend the end of the body and to walk away. In four or five 

 minutes the end of the body became extended, and it began to walk. The 

 head and body are dull black ; the hairs grayish white ; the ochreous dor- 

 sal markings not yet to be seen. 



The larvae described below were received from Miss Morton, June 4. 

 Do not eat willow, but feed on oak. 



Stage 7/.— Length 10 mm. rafter first molt). The body and head are 

 of the same shape and proportions as in 0. americana and sylvatica, but 

 with the dorsal piliferous warts more distinct ; a pair of dorsal warts on 

 each segment, making two distinct rows, between which are two parallel 

 broken, irregular, snuff-yellow, thread lines, beginning on the third thor- 

 acic and ending on the seventh abdominal segment. The body is dull 



