north american lepidoptera. 77 



4. Smerinthin.e. 



Larva rugose, with the anterior segments tapering towards the 

 head, which is abi-uptly and decidedly hirger, flattened in front and 

 angular above, horn straight. 



Imago with the head and thorax short and broad ; palpi small, 

 antenuiie of % more or less pectinated. 



5. ACHERONTIN^. 



Larva thick, clumsy. Sphinx-like, but with the horn always more 

 or less recurved at the tip and tuberculate or granulose. 



Imago clumsy ; legs, antennse and proboscis thick, the latter very 

 short ; head, thorax and abdomen short and broad. 



6. Springing. 



Larva with the anterior segments very slightly smaller than the 

 posterior, generally marked with oblique lateral stripes ; horn (when 

 present) rather long; head tolerably large; position of the larva in 

 repose almost sigmoidal. 



Pupa with an external sheath for the })roboscis. 



Imago, Choerocampine iu form, but with the head generally 

 smaller, the thorax variable in length, proboscis very long. 



Mr. Butler evidently derives most of his group characters from 

 the larval stages ; as applied to the American genera, the sequence is 

 as follows : 



Ma c roglossin ve. 



Lepisesia, Hemaris (incl. Hjemorrhagia), Macroglossa (for errato 

 Bd.), ^Ellopos, Thyreus, Amphion, Deidmnia, Proserpinus, Euproser- 

 pimis, Enyo. 



Ch(erocampin.e. 

 Otm, Ampelophaga, Phceroccmipa, Darapsa, Deilephila, Philampelus, 

 Argeus, Pachylia. 



AmBULICIN/E. 



Are not North American. 



Smerinthin^e. 

 Triptogon, Cressouia, Paonias, CalasyiiiboluH, Smerinthus. 



ACHERONTIN^E. 



Contains no North American genera. 



