&2 [May 



so numerous, comparatively few pass beyond the larval state, the larger 

 proportion falling victims to the parasite peculiar to it. Of twenty-five 

 larvae, which I placed in my breeding cage, only five became chrysal- 

 ides. From the body of each of the others when full grown, a number 

 <jf grub.s emerged, and spun themselves up in small white cocoons, placed 

 with perfect regularity side by side, forming a compact bundle, usually 

 round in form, made up of from twenty to sixty cocoons — the whole en- 

 veloped in a cotton-like substance. The cocoons are in every instance 

 spun underneath the larva, to which they are attached by the sides of 

 the lower layer, instead of by their base, as they commonly are ; as the 

 mass increases, the body of the larva above it, is raised up from the 

 leaf or stem on which it rested, embracing the bundle in its curve. 



The larva presents us with an instance of great tenacity of life. 

 Although every portion of its body had been honeycombed by the 

 escape of the large number of parasites which it inclosed — sufficient, 

 one would suppose, to produce speedy death — I have known its life 

 to be prolonged for a period of seven days thereafter. 



LiMENiTis ARTHEMis, Drury. 



Larva, whitish, with small blue dots ; protuberances, terminal seg- 

 ments and under side, olive green. Head, cordate, tuberculated and 

 spined. Body, on the second segment, with two branching spines; 

 on the third and fifth, each, two protuberances; on the eighth, two 

 tubercles with elevated radii; on the ninth, two similar, but larger; 

 on the eleventh, four spinous tubercles. Feeds probably on the Balsam 

 Poplar (Poptdus balsami/era^, beneath which the larva was found, 

 fully grown. 



Chrysalis. 1.10 in. long; whitish, with margin of wing-cases and 

 dorsal projection greenish — the latter silvery on its sides. Head-ca.se, 

 square, with two short, blunt, diverging horns ; thoracic carination 

 rounded, slightly elevated above the following segment; dorsal projec- 

 tion, compressed laterally, quite prominent, forming nearly three-fourths 

 of a broad oval ; margins of wing-cases quite angular ; central segments 

 nearly cylindrical — terminal ones contracted abruptly; terminal spine, 

 short and broad. 



As it hangs suspended, it frequently turns from side to side, and very 

 seldom rests perpendicularly. It becomes a chrysalis after the larva 



