202 Journal New York Entomological Society. [Voi. viii. 



I had to return to Phoenix, where oak does not grow, and there- 

 fore gave Sa//x fluviatalis for larvre to feed upon. Only fifteen 

 accepted the change of food. The others gradually died between 

 July iSth and 21st, and July 23d all were dead. 



Larva eight days old. Head shining black, covered with whitish 

 hair ; round in shape. Ground color of body, which is cylindrical, 

 light umber-brown all over, inclined to lighter tints on abdominal 

 parts. Dorsal and lateral parts covered by bunches of spines, which 

 like the shafts are black. Two rows of dor.sal shafts and one each 

 subdorsal. Segments 2 to 4, each bear a transverse row of four 

 bunches of stinging spines. Shaft bifurcated, fork two-thirds as 

 long as the stem, tip surmounted by a long, black, curved spine, and 

 some of dorsal row by two spines. Shafts of segment 2 not so long 

 as of 3 and 4. Segments 5 to 13 each contains a transverse row 

 of four black, tuberculous shafts, each bearing a spine, and those 

 of dorsal row a second rudimentary one. The subdorsal shafts only 

 half so long as those of two dorsal rows. Thoracic legs darker than 

 prolegs. Body sparingly covered by whitish secondary hairs. Length 

 of larva at rest 6 mm., in motion 7 mm. Width i mm. 



All the other larvce died inside of two weeks, although feeding 

 constantly on Qiicrciis uiidi/Iafa, an oak they are mostly found on. 



On my ne.xt trip to Prescott I found forty-nine spinose, black- 

 looking larvae on Qiicrciis luidulafa, August 8, 1898, which proved to 

 be Pamina. These were gregarious and when disturbed dropped to 

 the ground. They would follow one another like H. lo, but did not 

 rest in similar rows, more sardine-fashion. Apparently the larvi^ 

 represented the beginning of third stage. Examined larvae August 

 nth, at noon. Length of larvae 16 mm. at rest and 18 mm. when 

 in motion, ^\'idth across middle of body 3 mm., and that including 

 spines 5 mm. Antenna; brown, mouth parts light brown. Body 

 covered by six longitudinal rows of black, tapering, spinulated tuber- 

 cles, having on the largest of second joint 19-20 black, fleshy protu- 

 berances or spinules, each with a seta at the end. The two dorsal 

 rows have longest tubercles. On segment 2, tubercles are 4 mm. 

 long. Between the black spines of dorsal tubercles is a mass of whit- 

 ish, woolly hair. Color of body sooty black. Head shining black. 

 A fine white, interrupted dorsal stripe lines each side of both rows 

 of the tubercles on dorsum. There is a white, uneven, interrupted 

 double line between subdorsal and infraspiracuiar row of tubercles. 



