152 Annals Entomological Society of America [Vol. IX, 



around entire dorsal margin of first pair of wings, and seldom 

 concealed by them on the third abdominal segment, produced 

 below the anal angles of first pair of wings to the caudal margin 

 of the fourth abdominal segment; spiracles usually free, the 

 first and second seldom partially covered by the wings ; abdom- 

 inal segments with the two dorsal rows of tubercle scars 

 generally distinct, but never having the row on the ventral 

 surface between the spiracular line and the proleg scars ; abdom- 

 inal segments 5-7 with their dorsal cephalic margins produced 

 into narrow flange-like plates extending laterad to the spiracular 

 line, with a distinct notch at meson and the median line indi- 

 cated by oblique striations, also with a raised, wavy line between 

 the segment and the transverse conjunctiva; abdominal seg- 

 ments 8-10 with the caudal end produced into a narrow blunt 

 tip; the scars of the anal prolegs never distinct on each side the 

 anal plate; cremaster absent. Length, abdomen retracted, 

 30-35 mm., expanded, 40-45 mm.; girth about 50 mm. 



Samia cecropia Linnaeus. — (Figs. 8, 9, 10). Color variable, 

 usually chestnut brown with black on thorax and appendages, 

 sometimes yellowish brown, but never entirely black; face 

 parts, appendages, and exposed surface of thorax with fine, 

 indeterminate, transverse striations, dorsal abdominal segments 

 1-8 finely rugose, but dull in appearance, not resembHng velvet, 

 remainder of surface practically smooth; antennas of male with 

 the stem of the fiagellum about one-fourth the total width of the 

 antenna and always extending beyond the pectinations, the 

 length of the antenna about two and one-half times the width 

 and almost reaching the tips of the second pair of legs ; antennae 

 of female with the stem of the fiagellum at least one-third the 

 total width, the length of the antenna about three and one-half 

 times the width and never extending as far as the tips of the first 

 pair of legs; clypeo-labral suture generally distinct, clypeus 

 prominently convex cephalad of the labrum; labrum concave 

 on its proximal margin, broadly rounded at distal end, the 

 width more than twice the length; maxilla, measured on 

 meson, about one-fifth the length of the wings, length and width 

 approximately equal; third pair of legs very rarely showing 

 between the wings; mesothorax with the alar area polished, 

 usually showing a distinct tubercle or tubercle scar; meta- 

 thorax without distinct tubercles ; second pair of wings usually 

 visible around entire dorsal margin of first wing, often almost 



