170 
MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 
the antennal joints, and ciliated. Palpi large and stont, ascending, cnrving up in front of the 
clypens, and reaching well beyond the front of the headj the hairs beneath thick and spreading; 
third joint small, conical. Maxilhe short, not reaching out to the palpi. Thorax with a high 
pointed median tuft, sloping behind. 
Fore wings a little less than one-half as broad as long; costa convex, esi»ecially toward the 
apex, which is rounded; outer edge oblique, slightly convex to the internal edge. Venation: A 
long narrow subcostal cell; second and tliird subcostal venules unusually short, the ai>ical space 
between the costa and subcostal vein being very narrow; in this respect the genus is much as in 
Lophodonta (especially L. basitriens)] the third subcostal venule is one-half as long as the second. 
The venation is otherwise as in Notodonta, the discal veins being the same, and vein VI looped at 
base, as in I^otodonta. 
The genus differs from xiotodonta in having no tuft on the inner edge. The hind wings differ 
from those of l^otodonta in being shorter and rounder and in the apex being more produced, 
while the venation differs 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 Xotodonta, being rather slender, the femora and tibia? densely pilose, 
the latter with moderately large tibial s])ines. Abdomen blunt at the end, with a small anal tuft. 
Coloration: The only NoiTh American species is whitish gray, with brown between the 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 li^otodonta; 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 Xotodouta not only in tlie more broadly iiectinated antenna*, but in the much longer 
palpi and the squarer fore wings, the outer edge being less oblique, while the internal edge is 
simple, not bearing a tuft. The hind wings are also a little shorter and more rounded at the apex 
than in [Notodonta. 
Larva . — The larva differs from that of Notodoiita, or any other genus of the family, in the 
abdominal segments being nearly all provided Avith a dorsal hump, the abdominal segments 1 to 8 
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 posterior part, the 
two looking very much like the bill of an eagle, and siiscejAtible of being opened and closed.” 
(Marlatt.) It is silvery green, with dark bluish green subdorsal and lilaceous lines on the thoracic 
segments. It is e\idently adapted for protection while 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 pointed at the end, which bears an unusually long, 
slender, sinooth, round cremaster, armed with very short curled seta;, and ends in two up-curved 
slender, hooks. The surface of the bod 3 ^ with shallow and sparse pits; on the sutures of the 
abdominal segments very finel^^ shagreened. 
Cocoon . — Formed of thick, brownish silk, situated within folded leaves or uuder some slight 
protection at the surface of the soil. Concealed by particles of earth. (Marlatt). 
Geor/raphical disiribuMon . — Besides a single species inhabiting the Atlantic and Central 
States of North America, including Kansas, Walker describes a species (IL. pallida) from Nepaul, 
and Oberthiir describes and figures V. davidi from the north of China, which is veiy similar to 
oiir hidentata. The genus is not represented in western Asia, southern India, or in Europe. 
