OF ARTS AND SCIENCES. 83 



disappeared. The spiracles are now black and very distinct. The 

 tubercles are deep orange at the end, the dorsal ones bearing mostly 

 blackish bristles, with one or two white ones, those on the side of the 

 body being pale ; the lateral tubercles are orange, all the prothoracic 

 tubercles deep orange, and the segment itself is edged with greenish 

 yellow orange. The thoracic legs are deep orange ; the abdominal 

 legs green, tipped at the planta with yellow orange. 



There is now a lateral curved white band connecting the lateral tu- 

 bercle on the 9th segment, with the corresponding one on the siiranal 

 plate. Along the back and between the dorsal tubercles the skin has 

 a soft glaucous bloom. The head is dark chestnut-red, as before. 



In this stage the larvae frequently assume a sphinx-like attitude, 

 while those of P. cecropia and S. cyjithia do not seem to, but these 

 two species are in general more active, trying to escape from con- 

 finement. 



Stage III. — Moulted July 1. Length 20 to 25 mm. The color of 

 the head and tint of the body as before. The larva now differs in the 

 segments being more convex and angular, or in transverse section some- 

 what square, somewhat as in the last stage. All the tubercles are 

 alike in being pea-green at base, becoming deep reddish orange at the 

 end, and bearing partly black and partly white spines or bristles, except 

 the two median short tubercles on the prothoracic segment, which are 

 yellow, and concolorous with the yellow margin of the whole segment. 

 There are more white bristles on the abdominal than on the thoracic 

 segments. 



The spiracles are unusually narrow, being vertically almost linear, 

 and orange-red, i. e. concolorous with the tubercles at the end, and now 

 directly behind them is the mo7'e or less distinct yellowish lateral slightly 

 oblique stripe connecting the lateral tubercles of the lower and of the 

 upper roiv, and which touches each spiracle. (These were indicated, 

 though less distinctly, in Stage II.) 



The beautiful pale purplish whitish band or edging on the suranal 

 plate, and connecting the two lower lateral tubercles of the 9th abdom- 

 inal segment, is wow very distinct; above, it is edged within with a 

 linear brownish line forming a V, which does not reach the tubercles 

 on either side, in fact only extends about half-way from the end of 

 the suranal plate to the base. The median dorsal tubercle on the 8th 

 abdominal segment is still plainly double, and larger than any of the 

 others. 



"We thus have assumed in this stage the characters of the larva in 

 its final stage. 



