428 ENTOMOLOGICAL SOCIETY 



epines dentelees etlesautres he"rissesdepointes longues, chochues, 

 recourbees en arriere et de longueur egale." 



A. bicolor Harr. The larva has been fully described by 

 Walsh (Proc. Bost. soc. nat. hist., ix, 292, 1863, and Proc. ent. 

 soc. Phil., iii, 425, 1864), Jewett (Pap. ii, 138 and 144, 1882) and 

 Packard (Proc. Am. phil. soc., xxx, 137, 1893) and referred to 

 without name by Siewers (Can. ent. x, 85, 1878). It varies re 

 markably in the subdorsal silver horns which are usually un 

 equally developed on successive segments, but occasionally 

 revert to the generalized condition and are equal on all segments. 



Genus Syssphinx Hiibn. 



(=Psephopaectes G. & R., Ceroderes Boisd.) 



.5". molina Stoll. This larva is the most highly modified of 

 any of the group. According to the figures of Stoll (Suppl. 

 Cram. Pap. exot. pi. 22 fig. 4) and Sepp (Surin. Vlind. iii, pi. 

 118) it is humped up at joints 5 and 12 in a peculiar attitude and 

 the horns are nearly absent. The subdorsal thoracic pairs are 

 short, wholly or partly red, and the single dorsal one on joint 12 

 is reduced to a granule. Otherwise the larva is nearly smooth, 

 though the dorsal surface of joints 12 and 13, which forms an 

 oblique plane, is roughened with granules. 



Boisduval remarks (Ann. ent. soc. Belg., xv, 82, 1872) that a 

 specimen before him had the horns long, black, and recurved ; 

 but possibly this is another species distinct from molina. It is 

 not stated that the larvae were bred. 



5. bisecta Lint. Jewett remarks (Pap. ii, 40, note) that a 

 larva obtained by bush beating in company with A. bicolor 

 larvae had no silver horns, but only the rudiments on one seg 

 ment. Otherwise it closely resembled bicolor and was supposed 

 to be a larval variation till it was bred. 



6". heiligbrodti Harv. An unbred larva, which I am inclined 

 to refer to this species, was received from San Antonio, Texas. 

 Another specimen is in the collection of the National Museum, 

 received from Dr. Duges in Mexico. 



Head conic, somewhat triangular, but flat at the vertex, flat 

 tened also before and at the sides, the clypeus small, shield- 

 shaped, both it and the paraclypeal pieces coarsely roughened, 

 the head surface punctate-shagreened ; green, a white stripe from 

 before ocelli to vertex of each lobe, edged before and behind 

 by a darker green than the ground color ; antennae and labrum 

 white ; width 5 mm. Body cylindrical, feet large with coarsely 

 granular shields ; the anal shields large, triangular. Joint 2 con 

 tractile, cervical shield small, smooth, weak, a row of large, conic 

 granules on the anterior edge with patches of smaller ones below 

 on the sides. Subdorsal horns of meso- and metathorax (tuber 

 cles ia-{-ib and iia-j-iib) long, recurved, slightly dentate with 



