north american lepidoptera. i i 



4. Smerinthin.e. 



Larva rugose, with the anterior segments tapering towards the 

 head, which is abiniptly and decidedly larger, flattened in front and 

 angular above, horn straight. 



Imago with the head and thorax short and broad ; pali)i small, 

 antenme 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, antennae and proboscis thick, the latter very 

 short ; head, thorax and abdomen short and broad. 



6. Sphingin^. 



• 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 

 rej^ose almost sigmoidal. 



Pupa with an external sheath for the i)roboscis. 



Imago, Choerocampine in 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 : 



Macroglossin^. 

 Lepisesia, Hemaris (inch Hfemorrhagia), Macroglossa (for errato 

 Bd.), ^Ellopos, Thyreus. AmpJiimi, Deidmnia, Froserpinus, Euproser- 

 piiius, Enyo. 



Chcerocampin^. 



Otns, Ampe/ophaga, Phcerocavipa, Darapsa, Deileph'da, Philampelus, 

 Argeus, Pachylla. 



Ambulicin.e. 

 Are not North American. 



Smerinthin.?5. 



Triptogon, Cressonia, Paonlas, Calasyhiholm, Smerintlim. 



Acherontin^.. 



Contains no North American <renei'a. 



