315 



base of antennae white ; true legs black. Legs sixteen, all of the prologs 

 equal in length. Gait regular, creeping. 



One formed its cocoon about Aug. 3, 1838. 



Found two on willow in August, full grown ; figured Sept. 16, 1849. 



Black, with garnet red setlferous tubei'cles, hairs brown and short, and a 

 row of brilliant, citron yellow spots on each side, in the line of the stig- 

 mata, and two dorsal rows of small, irregular, Avhite spots. The tubercles 

 on the eleventh segment largest, and 

 elongated slightly. The white dorsal 

 spots are about four on each segment, 

 two on the anterior and two on the 

 posterior edge. The lateral yellow 



spots are double, half being on the posterior edge of one, and the other half 

 on the anterior edge of the following segment ; between the spots a black 

 space, in the middle of which Is the white spiracle above, and a tubercle 

 just below it. There are about ten tubercles to each segment, nearly in 

 one transverse row, six above the yellow line, and two on each side below 

 it. Head, legs and prolegs, black. 



This beautiful larva is easily known at all ages by its deep black color 

 and row of conspicuous yellow spots on each side, with the two rows of 

 irregular white dots above. It rolls in a ball sometimes when touched. 

 These specimens differ from the one previously described in being entirely 

 black above and below, except the tubercles and rows of white and yellow 

 spots. 



Cocoons made in box, Sept. 17 and 18, 1849. 



Caterpillar in Potato-stalks.^ 



July 8, 1848. With ten prolegs and six true legs, a corneous plate on first 

 and last segments ; four black, shining points, two and two, on the back of 

 each segment; a lateral row of much larger ones on the sides (of which there 

 are three on the side of each segment, one large and two small, besides the 

 black spiracle making a fourth black point) , and also below the lateral line 

 two more black points on each side of every segment, those on the segments 

 furnished with prolegs, being on the sides of the prolegs themselves. Length 

 nine tenths of an inch. Elongated, slender, jjale purplish brown above, with 

 three dorsal white lines, the central one continuous, the others interrupted 

 on the middle of the back, from the fourth to the seventh segments inclusive 

 (these three lines begin on the second segment). On the sides of the first and 

 second segments there is an abbreviated, white stripe, and above the third 

 and fourth prolegs another white stripe. Head, dorsal and anal plates wax 



* [See Harris, Treatise Inj. Ins., 3d edition, p. 440.] 



