278 Annals Entomological Society of America  [Vol. VII, 
The superfamily Saturnioidea may be divided into three 
families as follows: 
A. Pupae with the movable segments provided with flange-like plates 
which prevents their being telescoped, their lateral margins distinctly 
tapering caudad and each segment noticeably srnaller than the segment 
cephalad of it; wings never elevated dorsad above the surface of the 
body; a distinct cremaster always present; stem of the flagellum of 
the antenna never elevated and distinct. 
B. Pupae with a distinctly bifurcate cremaster; body usually rough- 
ened with spines on the exposed surface of the thorax and 
abdomen; metathorax with prominent oblong tubercles on each 
side the meson extending one-third or more of the distance 
between the meson and the margin of the first pair of wings; 
pupae always found in the ground............. Ceratocampide 
BB. Pupae without a distinctly bifurcate cremaster; body never 
roughened with spines on the exposed surface of thorax and 
abdomen; metathorax never with prominent oblong tubercules: 
pupae found either in cocoons or in the ground ....Hemileucide 
AA. Pupae with the movable segments never provided with flange-like 
plates which prevent their being telescoped, the lateral margins approx- 
imately parallelso that the segments appear of equal size and are 
usually telescoped so that only the caudal margins of the segments 
are visible; wings prominently elevated dorsad above the level of the 
body, the caudal portion of the mesonotum and metanotum always 
depressed adjacent to the wings; a distinct cremaster rarely present; 
stem of the flagellum of the antenna always elevated and distinct. 
Saturniidz 
THE FAMILY CERATOCAMPIDA. 
Body with the margins of the free abdominal segments 
usually bearing a row of spines, and the exposed surface of the 
thorax and abdomen usually roughened with spines; antennae 
never broadly pectinate throughout, but broadly pectinate 
and almost parallel for about one-half the length, then narrowed 
rapidly to about half the greatest width, tapering gradually 
to a pointed tip, the stem of the flagellum never distinct, the 
surface convex and the central axis of the antenna usually bear- 
ing one or two rows of small spines; maxillae, measured on the 
meson, never less than one-fourth the length of the wings; tips of 
the tarsi of the second pair of legs meeting obliquely on the meson, 
never lying adjacent on the meson; proleg scars very promi- 
nent on abdominal segments five and six, the scars for the anal 
prolegs often very conspicuous; first pair of wings with the 
anal angles broadly rounded, usually located at the cephalic 
margin of the fourth abdominal segment and never reaching 
ventrad to the caudal margin of the fourth segment; second 
pair of wings never produced below anal angle of first wing and 
