Trl, 
1914} Pupe of Ceratocampide and Hemileucide 293. 
Genus Hemileuca Walker. 
Face parts slightly elevated above the surface of the body; 
antennae with the stem of the flagellum indistinguishable from 
remainder of surface, entire surface flat to uniformly convex, 
tapering gradually to a point at the distal end; invaginations 
for the anterior arms of the tentorium distinct; eye-pieces. 
both present; clypeo-labral suture generally distinct; maxillae, 
measured on meson, never more than one-sixth the length of 
the wings, each half quadrilateral; less than half the exposed 
tibiae and the tarsi of the first pair of legs with the tips of the 
second pair of legs adjacent on the meson; second leg visible 
for almost entire tibial and tarsal length; median thoracic 
line always distinct on prothorax and mesothorax, seldom on 
metathorax; first pair of wings with the anal angles broadly 
rounded near cephalic margin of fourth abdominal segment; 
second pair of wings visible along entire dorsal margin of first 
wing, its margin entire, but never produced beyond anal angle 
of first pair of wings and never visible on the ventral surface; 
spiracular line almost straight; cephalic margins of abdominal 
segments 5 to 7 produced into thick, oblique flange-like plates; 
suture between the seventh and eighth abdominal segments 
deep, both margins usually strongly crenulate, the crenulations 
of the two sides fitting together like a set of teeth; cremaster 
short, pointed, never exceeding two millimeters in length. 
This genus includes at least nine species found in the United 
States, only three of which are described here. The most 
common species is H. maia, which is found from the Atlantic 
states westward to the Rocky Mountains. The others are 
reported from the western states. These moths spend their 
pupal life in the ground. The species described can be sepa- 
rated by the following key: 
A. Suture between the seventh and eighth abdominal segments very deep, 
the edges distinctly crenulate. 
B. Clypeal region strongly convex; labrum strongly elevated; max- 
illae short, inconspicuous, each half triangular in outline and 
length on meson less than a millimeter; mesothorax with a 
tubercle on each side the meson outlined by a depressed ring. 
burnsi 
BB. Clypeal region not strongly convex; labrum not elevated; maxillae 
conspicuous, each half quadrangular in outline and meeting 
on meson for at least a millimeter; mesothorax without tuber- 
CUleswoOnmeaGhisscid Cather MMeSOME er tnn tec. os cicte soh Pate, ohare yee a= maia 
AA. Suture between the seventh and eighth abdominal segments not very 
deep, the edges without distinct crenulations................... olivie 
