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bb. Maxillae never extending free beyond the caudal margin of the 

 wings. 

 c. Body with a dense covering of long setae and whitish bloom ; 

 mesothoracic spiracle with a strongly elevated oval area adja- 

 cent to its caudal margin, this area chitinized in the center and 

 surrounded by a dense band of short setae with a longitudinally 

 striate chitinized rim forming an outer margin. 



Pholisora Scudder. 

 cc. Body sparsely covered with short inconspicuous setae ; dense 

 whitish bloom never present ; mesothoracic spiracle with a some- 

 what circular elevation adjacent to its caudal margin, which is 



entirely covered with setae Thanaos Boisduval. 



aa. Abdominal segments 5-7 with an elevated ridge or flanged plate 

 along the cephalic margin which prevents their being telescoped ; 

 body with a prominent convexity on the ventral surface in the 

 region of abdominal segments 1-4. 

 b. Mandibular area with distinct tubercles which are usually black 

 and bearing stout setae ; head slightly narrower than the meso- 

 thorax. 

 c. Mesothoracic spiracle semicircular in outline, the opening circu- 

 lar, a broad thick band of setae around the caudal half, 

 d. Dorsal furrow or depression on the ninth abdominal segment 

 with its caudal margin distinctly crenulate; ventral surface 

 of cremaster with an elongate furrow broadened out at the 



distal end of the cremaster Thorybes Scudder. 



dd. Dorsal furrow or depression on the ninth abdominal segment 

 not distinctly crenulate ; ventral surface of cremaster with 

 a triangular depression broad at the proximal end and nar- 

 rowed to the distal end of the cremaster. 



Epargyreus Hiibner. 

 cc. Mesothoracic spiracle semicircular in outline, the opening cir- 

 cular and surrounded by a broad thick band of setae, and 

 caudad of this a distinctly elevated chitinized ridge forming an 



outer margin Cocceius Godman and Salvin. 



bb. Mandibular area smooth, without tubercles; head as broad as the 

 mesothorax Eudamus Swainson. 



The following species were examined : 

 Calpodes ethlius Cramer 

 Amblyscirtes mails Edwards 

 Pholisora catullus Fabricius 



Thanaos brizo Boisduval and Le Conte, lucilius Lintner 

 Thorybes daunus Cramer 

 Epargyreus tityrus Fabricius 

 Cocceius pylades Scudder 

 Eudamus proteus Linnaeus 



