287 



ring. Tlie upper side of the body greenish gray ; tubercles same color, but 

 surrounded by a large black spot, which gives a general black color to the 

 whole body. The white spots are between the tAvo up]:>er rows of lateral 

 tubercles. 



Arctia americana Harr. ? or scribonia Stoll ? 



From Prof Agassiz's collection. Oct. 9, 1848. 



Body black, with silvery Avhite spiracles and short, close shaved hairs, 

 which are gray on the back, and rust brown on the sides. Hairs on the first 

 tliree segments entirely rust brown, with which are intermingled some 

 longer hairs overhanging the head. Intersections opaque and black, like 

 rest of body. 



Larva black, with silvery white, conspicuous spiracles. Head shining 

 black, immaculate. Legs and prolegs black. Body with minute, setiferous, 

 dusky tubercles regularly arranged, but not visible on account of the hairs 

 which arise from them in tufts. The tufted hairs short and even, as if 

 sheared. They form a broad gray stripe, from the top of the fourth seg- 

 ment to the end of the body. ' The tufts at the sides, and on the first three 

 seirments, are rust brown. luterminoled with the sheared hairs on the first 

 and second and last segments are a few long hairs, overhanging each ex- 

 tremity, llolls into a ball. 



Arctia virginica Fabr. 



Larva, found common on the plantain, July 15-25, 1828. Body cylin- 

 drical, tuberculatcd, above straw colored with a lateral black line connected 

 with transverse dorsal ones dividin<j the segments. Tubercles straw colored 

 with black points and bundles of divaricating, pale straw colored hairs inter- 

 mingled with a few black ones. Tubercles twelve on each segment, four 

 dorsal, and four lateral on each side, the lowest three approximated and 

 situated beneath the stigma, which last is also beneath the lateral black 

 lines, and just above the lateral fold. This fold is of a pale sulphureous color. 

 Body beneath and intermediate i)rolegs black. Head, feet, anal prolegs 

 and tijis of the others pale ochreous. The tubercles are not situated in one 

 transverse hne, but of the dorsal ones the two upper are in front of the 

 others; the upper lateral tubercle is above and in front of the spiracle, and 

 the three under ones beneath and behind it. The hairs are of moderate 

 length, and all barbed. Some larvae of a dark rust color, Avith chestnut col- 

 ored hairs, also produced the same perfect insect. 9 ? 



Cocoon. Of silk interwoven with hairs. All the hairs are not used, 

 so that the larva appears to be clothed with a few short ones. 



Pupa. Chestnut brown, darker behind. Three dilated furi'ows surround 



