170 MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. 



the aiitt'iiiial joints, and ciliated. ral])i larjie and stont, ascending, (■nr\in}i- np in front of the 

 clypens, and reaching well beyond the front of the head; tlii^ hairs beneatli thick and sijreading:; 

 third joint small, conical. Maxilla- short, not i-eachiiiR- out to the i)ali)i. 'J'liorax with a hiiili 

 pointed median tuft, sloi)ing behind. 



Fore wings a little less than one-half as broad as long; costa convex, es])ecially toward the 

 apex, which is ronnded; outer edge obliciue, .slightly convex to the internal edge. Venation: A 

 long narrow snl)costal cell; second and third subcostal \enules unusually shoit, tlie a])ical sjiace 

 between the costa and subcostal vein being very narrow; in this resjiect the genus is much as in 

 Lophodonta (especially L. Imsitriens); the third subcostal \eiiule is one-half as long as the second. 

 The venation is otherwise as in Notodouta. the discal veins being the same, and vein A*I loojied at 

 base, as in Notodonta. 



The genus differs from Xotodonta in having no tnft on the inner edge. The hind wings differ 

 from those of Notodonta in being shorter and rounder and in tlie apex being more luoduced, 

 while the venation difl'ers in the costal vein being longer and turned up at the end on the costa; 

 otherwise the venation is much as in Notodonta. 



The legs are much as in Notodonta, being rather slender, the femora and tibia' densely ])ilose, 

 the latter with moderately large tibial s]iines. Abdomen blunt at the end, with a small anal tuft. 



Coloration : The only North American species is whitish gray, with brown between th(> cubital 

 vein and the costa, sending two prominent teeth toward the internal edge. There are no 

 transverse lines of any sort. The hind wings are chocolate-brown. 



This genus is distinguished by the antenna' being pectinated to the end, and with longer 

 branches than in Notodonta; by the large palpi extending well in front of the head; especially by 

 the high prominent median thoracic tuft, and by the well-rounded apex of the fore wings. It 

 differs from Notodonta not only in the more broadly i)ectinated antenna", but in the much longer 

 l)alpi and tlie squarer fore wings, the outer edge being less oblique, while the internal edgi' is 

 simjile, not bearing a tuft. The bind wings ai"e also a little shorter and more roimded at the apex 

 than in Notodonta. 



Larva. — The larva differs from tliat of Notodonta, or anj- other genus of tlic family, in the 

 abdominal segments being nearly all provided with a dorsal hump, the abdominal segments 1 to S 

 having each a "large anteriorly directed prominence ending in a bifid ridge, the incision being 

 transverse, the anterior portion being curved backward and larger than the jiosterior part, tlie 

 two looking very nnuli like the bill of an eagle, and susceptible of being opened and closed." 

 (Marlatt.) It is silvery green, with dark bluish green subdorsal and lilaceous lines on the thoracic 

 segments. It is evidently adapted for protection wiiile feeding on the edge of an elm leaf, the 

 serrations of the body resembling those of the edge of the leaf of its food plant. 



Pupa. — Body rather stout, somewhat ]>ointed at the end, which bears an unusually long, 

 .slender, smooth, round cremaster, armed with very short (uirled seta-, and ends in two u|)-curved 

 slender, hooks. The surface of the body with shallow and sparse ])its; on the sutures of the 

 abdominal segments very finely .shagrcened. 



Cocoon. — Formed of thick, brownish silk, situated within folded leaves or under some slight 

 I)rotectioa at the surface of the soil. Concealed by particles of earth. (Marlatt). 



Geof/raphical distribution. — Besides a single species inhabiting the Atlantic and Central 

 States of North America, including Kansas, Walker describes a species (V.jxr //;>?«) from Nepaul, 

 and Oberthur desia-ibes and figures X. davidi from the north of China, wliicli is very similar to 

 •our bidcntata. The geuus is not represented iu western Asia, southern India, oriu Europe. 



