152 JOHN B. SMITH. 



C hkeiwgnimma, with jasmineariun as the type, agrees with Dolba 

 in the unarmed legs, but has the eyes not hished, 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 Hyloicus sec- 

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

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

 the primaries. 



Finally, as nearest relatives of the Bombycidce come Ellevia and 

 Exedrium, with weak, short tongue, but otherwise sphingiforni habi- 

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

 giving the insect quite a bombyciform 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; thorax untufted : secondaries 



partly semi-transparent; legs unarmed Aiiiplioiiyx. 



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



crest; legs unarmed Dilophoiiota. 



Palpi normal ; thorax untufted ; size very small ; secondaries orange at base ; 



legs unarmed Cautetliia. 



Anterior tarsi armed outwardly with longer spinules; anterior tibia? usually 



spinose Protoparce. 



3. Eyes lashed 4. 



Eyes not lashed 5. 



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



with longer spines Sphiii.^. 



Tibife not spinose ; tarsi unarmed Uolba. 



.5. Legs unarmed Chla'iiograinma. 



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



Ceratomia. 



§i^ Tongue short and weak. 



Primaries narrow, pointed, sphingiforra Kllt'iiia. 



Primaries wider, rouuded, bombyciform Exedrium. 



AMPHOXYX Poey. 



Cent. T/ep. Cuba, 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 



