146 



bb. Tenth abdominal segment, viewed dorsally, in the form of a 

 transverse plate, concave on the caudal margin, the caudo- 

 lateral angles produced into lobes ; the other segments strongly 

 concave in ventral view, with five short curved spines inserted 

 close together in the eaudo-lateral margin of each lobe. 



Agapema Neumoegen and Dyar. 

 aa. Lateral margins of abdominal segments 5-7 always approximately 

 parallel, the caudal end of the body never with stout curved spines, 

 b. Maxillae always one fourth, or less, the length of the wings, the 

 proximal two thirds of their margins never strongly concave; 

 mesothoracic wings with their anal angles on the cephalic mar- 

 gin of the fourth abdominal segment or caudad of that portion of 

 the segment, 

 c. Maxillae 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 ; glazed eye-piece 

 seldom visible in the females, never in the males ; caudal end 

 of abdomen never with a band of coarse setae, 

 e. Eye-pieces never visible in either sex ; caudal end of abdo- 

 men never with spines or setae Callosamia Packard. 



ee. Glazed eye-piece visible in the females ; caudal end of abdo- 

 men with a few very short sharp spines. 



E upackardia Cockerell. 

 dd. Both eye-pieces visible in either sex ; caudal end of abdomen 

 with a transverse band of coarse setae. .RotJischildia Grote. 

 cc. Maxillae never less than one fifth the length of the wings ; an- 

 tennae 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 eye-piece always visible 



in the females Samia Hiibner. 



bb. Maxillae 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 Grote. 



The following species were examined : 

 Copaxa lavendera Westwood 

 Tclea polyphcmus Cramer 

 Tropaea I una Linnaeus 

 Agapema galbina Clemens 



Callosamia promctJica Drury, angulifera Walker 

 Bapackardia callcta Westwood 

 RotJischildia orisaba Westwood, jorulla Westwood 

 Samia cccropia Linnaeus, glovcri Strecker, Columbia Smith, rubra 



Behr 

 Philosamia cynthia Drury 



