278 



this last is another tubercle in most segments, whicli is tipped -with hairs 

 only. The feet are pale reddish or ochreous. The body beneath, Avhltisb, 

 spotted with black. There are numerous, short, whitish hairs or bristles on 

 the head and body. In many of these larvse there is a blackish lateral line 

 above the yellow one, and a large blackish spot surrounding a snialler yel- 

 low one in front of the upper lateral spine. The yellow color frc(juently 

 forms small transverse lines, especially on the margins of the segments above. 

 The younger the larva? the more does the black color prevail, so that it 

 appears to constitute the prevailing hue of the youngest larva*. 



No perceptible difference was observed in larva; from the Cnicus and 

 Onopordon. except that the full-grown ones oi'the latter had less black about 

 them, so that the dirty bluish white color of the body was mflre prevalent 

 and observable. In small larvaa of the thistle several days old and about four 

 tenths of an inch long, the whole body, head, spines and feet, were black, 

 but there was a faint yellowish spot around the first lateral spine (or tuber- 

 cle) of the fifth, seventh, and ninth segments. As the larva gro^vs older 

 these appear like six yellow spots; afterwards there are spots aroun;l the 

 dorsal tubercles in the same segments, and the spines from each of these 

 yellow tubercles become yellow also, and there is a yellowish, interrupted, 

 lateral line U2ion the fourth and remaining segmc^nts. The larva has then 

 become more than half an inch long. After another shnighing the doi-sal 

 yellow lines appear, and there are a few yellowisli spots on the posterior 

 half of the body. After every successive change of skin th(> larva becomes 

 lighter, till at length it assumes the hues of the full-grown insect before 

 described. 



A larva on a hollyhock about to suspend itself exhibited transverse, bluish 

 white bands across each segment, on which the s])ines were situated, the 

 tubercles of which were not reddish, but pale l)hie. The longitudinal, dor- 

 sal, yellow lines obsolete. Two transverse ochreous bands between each 

 segment and a little spot of the same color in front of each lateral tubercle. 



Found a larva on the leaf of a sunflower, Aug., 18"22, from which my 

 drawing Avas made. [PI. i. figs. 1, 2.] 



Head black, with white hairs; middle of the back with a yellowish line in 

 which arc situated white, branched spines tipi)cil with black; each side of 

 the yellow line a row of ytllow tubercles with branched spines upon the 

 edge of a black line; just below, upon the lower edge of tliis l)lack line, is 

 another row of branched spines, which is wide, and upon die upper ed"-e 

 another narrow yellow line; then a narrow blackish line, in which are the 

 spiracles, wiiich are black witliin, a lighter color encircling them; next a 

 yellow line, brighter than the former, with tubercles and white spines, not 

 tipped with black; next is tlie belly, of a light ash color, and hairy; feet 

 light ochreous yellow; tip of tail black; true feet ferruginous, tipped with 



