1916] Classification of the SatiirniidcE 137 



A. Body never cylindrical, but tapering gradually from the middle as in Fig. 13, 

 the lateral margins of the movable segments never approximately 

 parallel; caudal end of body usually with stout curved spines. 

 B. Tenth segment never flattened into a transverse plate, with the caudo- 

 lateral angles produced into short lobes. 

 C. Caudal end of body without spines; body surface with slightly 

 wavy, transverse ridges, with distinct furrows between;; 

 mesothorax never with a prominent tubercle at the base 

 of each wing. Copaxa. 



CC. Caudal end of body with stout, curved spines; body surface never 

 with slightly wavy, transverse ridges with distinct fur- 

 rows between; mesothorax with a- prominent tubercle at 

 the base of each wing. 

 D. Lateral aspects of the cephalic margins of abdominal seg- 

 ments 5 to 7 never with sharp, slightly wavy, 

 transverse ridges with distinct furrows between; 

 caudal end of body with an oval area set with 

 slightly curved spines, usually arranged in two 

 groups and nearly all pointing outwards. Telea. 

 DD. Lateral aspects of the cephalic margins of abdominal seg- 

 ments 5 to 7 covered with sharp, slightly wavy, 

 transverse ridges with distinct furrows between; 

 caudal end of body deeply rugose, with a slight con- 

 cavity containing a circular group of strongly 

 recurved spines. Tropaea. 



BB. Tenth segment, viewed dorsally, a transverse plate, concave on the 

 caudal margin, the caudo-lateral angles produced into lobes, 

 the segment strongly concave in ventral view, with five short, 

 curved spines inserted close together in the caudo-latcral 

 margin of each lobe. Agapema. 



AA. Body cylindrical in outline, as in Fig. 1-4, the lateral margins of the movable 

 •segments approximately parallel; caudal end of the body never with 

 stout curved spines, but sometimes with short, straight on^s. 

 B. Maxillae, measured on the meson, always one-fourth or less the length 

 of the wings, the proximal two-thirds of their margins never 

 strongly concave; first pair of wirgs with their anaf angles on 

 the cephalic margin of the fourth abdominal segment or caudad 

 of that portion of the segment. 

 C. Maxillae, measured on the meson, less than one-fifth the length 

 of the wings; antennae of males with the sides tapering 

 gradually to a pointed tip. 

 D. Both eye-pieces never visible in either sex; caudal end of 

 abdomen never with a band of coarse setae, some- 

 times with a few very short, straight spines. 

 E. Glazed eyepiece visible in both sexes; caudal end of 

 abdomen with a few very short, straight 

 spines. Eupackardia. 



EE. Glazed eyepiece never visible in either sex; caudal 

 end of abdomen never with short, straight 

 spines. Callosamia. 



DD. Both eyepieces visible in either sex; caudal end of abdomen 

 with a transverse band of coarse setae. Rothschildia 

 CC. Maxillae, measured on the meson, never less than one-fifth the 

 length of the wings; antennae of males with the sides 

 approximately parallel for the greater part of their 

 length, tapering rapidly to a blunt, rounded tip; a small 

 portion of glazed eyepiece always visil le in the females. 



Samia. 

 BB. Maxillae, measured on the meson, always more than one-fourth the 

 length of the wings; the proximal two- thirds of the lateral 

 margins of the maxillae concave; first pair of wings with their 

 anal angles on the third abdominal segment, opposite the second 

 pair of abdominal spiracles. Philosamia. 



