298 Annals Entomological Society of America  [Vol. VII, 
A. Cremaster triangular, at least two millimeters long, with a transverse 
row of hooked spines curving dorsad; cephalic margins of abdominal 
segments 5 to 7 produced into an oblique, flange-like plate with an 
undulate margin produced into prominent curves dorsad of the 
spiracular: Iie soins Se See nay Poe eee an ee ene ee leucana 
AA. Cremaster never triangular, usually only a button-like constriction 
with a thickly set group of strongly recurved spines, the tips curving 
outward in all directions; cephalic margins of abdominal segments 
5 to 7 produced into an oblique flange-like plate with its margin 
entire, never produced into curves dorsad of the spiracular line. 
B. Mesothorax with fine indeterminate transverse striations; body 
SEUACiCONSPICUOUS), a. crs Se areca ee eee ee ee re io 
BB. Mesothorax never with fine indeterminate transverse striations; 
body setae inconspicuous. 
C. Mesothorax rugose; a small tubercule each side the meson 
on the metathorax and first three abdominal segments. 
pamina 
CC. Mesothorax tuberculate with blunt conical projections; 
never with small tubercules each side of the meson on 
the mesothorax and first three abdominal segments. 
incarnata 
Automeris pamina Neumoegen. Color dark brown; body 
setae inconspicuous, light brown, few in number; face parts 
and appendages with fine, indeterminate transverse striations; 
exposed surface of thorax rugose, remainder of surface finely 
shagreened; length of antennae in both sexes more than four 
times the breadth and ending in line with the tips of the first 
pair of legs; labrum variable, length and breadth approximately 
equal, usually six-sided and pointed at distal end; maxillae, 
measured on meson, about one-sixth the length of the wings, 
triangular in outline, median length greater than the greatest 
width; cephalic margins of abdominal segments 5 to 7 with 
fine ridges, becoming indistinct on the meson of both dorsal and 
ventral surfaces, the margin produced into a flange-like plate 
with its margin entire, never produced into prominent curves; 
dorsal surface of abdominal segments 4 to 7 with a smooth, 
elevated line just cephalad of the junction of segment and 
transverse conjunctiva, extending laterad and ending beyond 
the spiracles on ventral surface; dorsal and lateral surfaces 
of tenth abdominal segment rugose with irregular, longitudinal 
depressions at the base of cremaster. Cremaster short, con- 
stricted slightly at base and forming a rounded protuberance 
with a closely set group of strongly recurved spines, the tips 
turning outward in all directions. Length, abdomen expanded, 
from 1 1-8” to 114"; girth about 134”. 
