1916] Classification of the SaturniidcB 145 



inal segments 5-7 produced into flange-like plates, widest at the 

 meson and ending opposite the spiracles; line between segment 

 and transverse conjunctiva elevated on dorsal aspect; tips of 

 antennae generally separated by second pair of legs, ending in 

 the female half-way between the tips of the first and second 

 pairs of legs, in the male opposite the tips of the second pair, 

 tips of antennae in both sexes frequently meet on meson, those of 

 male slightly longer and wider than those of female, the length 

 never more than three times width; no eye-pieces visible; 

 labrum variable, broadly rounded distally; maxillae generally 

 smooth, sometimes separated on meson to show coxal cases 

 beneath, length on meson equals breadth at cephalic end; 

 margin of second pair of wings scarcely bisinuate, produced 

 into a rounded anal angle and extending less than half way 

 across caudal margin of the first pair; mesothoracic spiracles 

 small; first and second abdominal spiracles partially covered 

 by the wings; spiracular openings located at the bottom of 

 lenticular depressions, lips of the depression smooth and glossy, 

 and of the opening, rounded and qf a different color; abdominal 

 segments 8-10 taper rapidly to form a cone, occasionally with 

 a button-like tip. Length, abdomen retracted, from 20-30 mm., 

 expanded, 25-35 mm. ; girth about 40 mm. 



Callosamia angulifera Walker. — Color generally yellowish 

 or yellowish brown, darker brown on the middle of the back 

 and around the margins of spiracles, usually a darker color 

 pattern on wings; dorsal aspect of thorax and abdomen with 

 deep, wavy, transverse striations, fine indeterminate striations 

 on face parts and appendages, the remainder of the surface 

 practically smooth; dorsal cephalic margins of abdominal seg- 

 ments 5-7 never produced into flange-like plates; line between 

 segment and conjunctiva on dorsal aspect elevated and cor- 

 rugated; antennae of male meet on meson and lie adjacent to 

 each other for a distance nearly equal to their width, their 

 length three times the width, antennas of female separated to 

 show first and second pairs of legs, their length three and one- 

 third times width, ending just below first pair of legs; no eye- 

 pieces visible; labrum variable, usually broadly truncate dis- 

 tally; maxillae with mesal length greater than breadth at 

 cephalic end; margin of the second pair of wings deeply 

 bisinuate, a narrow portion produced below anal angle of first 



