t6 Studies on Life-history of Bombycine Moths. 



each end of the body twice as long as the others, the long ones 

 more numerous at the end than on the thoracic segments. The 

 dorsal hairs are sable-brown-black, so thick that the outlines of the 

 body can be scarcely seen through them ; the warts are also dark, 

 though the lateral warts are still reddish-tawny. From the lower 

 side of the supra-spiracular tubercles arise hairs which are all red- 

 dish-tawny; those arising from the upper edge are reddish at base, 

 and blackish on the end, or remainder of the hair. The lateral hairs 

 are bright tawny. The light buff-colored spiracles are now very 

 conspicuous, and are situated directly in front of the large tubercles. 



Note. There is a tendency in this and other Arctians to become, 

 after the 2d molt, much more hairy, so as nearly to conceal the 

 body, and thus, as by this time they feed in more conspicuous 

 situations, they are less edible to birds and less exposed to attacks 

 by ichneumons and Tachinae. 



This is now a very handsome caterpillar, the close dorsal hairs, 

 like the fur of the sable in general appearance, contrasting with the 

 bright tawny hairs on the sides, the bright conspicuous spiracles 

 showing through them. 



Life-history of Pyrrharctia Isabella (Abbot and Smith). 



Dyar remarks that this larva has ten stages. Psyche, V, 422. 



The eggs of this moth were received from Mr. H. Meeske, of 

 "Brooklyn, N. Y., and were laid in confinement May 12th. The larvae 

 were active, feeding on the wild cherry ; after hatching they scatter, 

 and eat away the surface of the under side of the leaf, not eating 

 holes in the leaves. Another set of eggs, laid in a small patch, was 

 found on the under side of an oak leaf at Brunswick, Maine, July 

 6th, hatching a day or two later. 



£Jgg. — Diameter O.Y mm. Hemispherical, but the dome is quite 

 high and regularly rounded, white, smooth and shining, and smooth 

 seen under a Tolles triplet, but under a ToUes ^ inch-objective the 

 shell is seen to be marked with a network of very fine, minute, 

 quite irregular polygonal areas, bounded by very slightly thickened 

 edges, as if they were the imprint of the cellular walls of the ovi- 

 duct. 



Larva, stage I. — Length 2.5 mm. Hatched June 14th. Head 

 dark chestnut, moderately large, no wider than the body, Protho- 

 racic shield moderately large, irregular in shape, wiih a transverse 

 furrow behind the middle; on the front ari.se four hairs, and on the 



