152 JOHN B. SMITH. 



C hhenogramma, with jmmuiearum as the type, agrees with Dolba 

 in the unarmed legs, but has the eyes not lashed, and is, as a whole, 

 more sphingiforni in appearance. 



Ceratomia has a retracted head, rather short tongue, not lashed 

 eyes, non-spinose fore-legs and armed fore-tibia. The outer margin 

 of primaries is somewhat retracted above the anal angle, marking 

 that point. In structure it most nearly resembles the Hyloicm sec- 

 tion of Sphiiix, but the species have a somewhat distinctive habitus, 

 not the least of which is due to tlie distinct transverse maculation of 

 the primaries. 



Finally, as nearest relatives of the Bombycidce come Ellema and 

 Exedrmm, with weak, short tongue, but otherwise sphingifoi'm habi- 

 tus. Exedrium seems to differ by the unusually rounded wings, 

 giving the insect quite a borabyciform appearance. 



In the form of a synopsis the genera would be separable as follows : 



§ Tongue long and, drong. 



1. Head large, prominent; eyes not lashed 2. 



Head smaller, never prominent somewhat retracted ; eyes variable 3. 



2. Palpi with terminal joint naked, prominent; thora.x untufted ; secondaries 



partly semi-transpareut ; legs nnarmed .4.iiiI>liOliyx. 



Palpi with terminal joint rarely naked; thorax with a prominent divided 



crest; legs unarmed Diloplioiiota. 



Palpi normal ; thorax untufted ; size verj^ small ; secondaries orange at base ; 



legs unarmed Caiitethia. 



Anterior tarsi armed outwardly with longer spinules: anterior tibiit usually 



spinose l*rotO|>sirce. 



i. Eyes lashed 4. 



Eyes not lashed 5. 



4. Tibiie spinose ; anterior always; median usually ; anterior tarsi usually armed 



with longer spines Splliiix. 



TibiiB not spiuose ; tai-si unarmed l>oIba. 



.5. Legs unarmed C'hlieiiograiuiiia. 



Anterior tarsi outwardly armed with long claws ; tibife not spinose. 



Ceratomia. 



§§; Tongue slwH and weak. 



Primaries narrow, pointed, sphingiform Ellema. 



Primaries wider, rounded, bombyciform E.xeilriiim. 



A.^IPHOXYX Poey. 

 Cent. Lep. Culm, Dec. i, 1832. 



Large, robust, yet graceful species. Head large, broad, distinct, 

 prominent ; eyes large, hemispherical, fringed with short bristly 

 lashes ; tongue stout, slightly exceeding the tip of the abdomen in 



