268 LEPIDOPTERA OF NORTH AMERICA. 



a disco-central branch below the middle. The median is two- 

 branched (?) from the insertion of the discal. 



Head with ocelli. Antennae of the males most frequently pecti- 

 nated, sometimes plumose, of the females sometimes subpectinated 

 or serrated. Palpi of moderate length, sometimes short, generally 

 curved and cylindrical. 



Body rather slender, cylindrical and smooth. Abdomen, with 

 a prominent tubercle on each side of the basal segment, generally 

 smooth, sometimes tufted along each side. Legs usually slender 

 and rather Igng. 



The same uncertainty is connected with the present limits of 

 this genus as with the preceding one. In general structure, the 

 species included in it are sometimes allied to the Lithosides and 

 again to the Bombycidae or to the European genus Syntomis. It 

 has been divided into a number of groups so as to indicate their 

 special peculiarities with accuracy. 



SYNOPSIS OF SPECIES. 



A. Discal areolet not narrow. 



B. Antennae of the g pectinated or plumose. 



C. General structure like that of Syntomis. 



D. Abdomen not tufted along each side. 



E. Palpi not porrect. 



F. Body and wings more or less metallic. 



G. Hind tibise not ciliated. 



t. Hind wings rounded or hardly angular. 

 j. Body hardly hairy. 

 k. Wings unspotted. 



I. Wings bright red. lichas. 



K. Wings very generally spotted or wholly blackish with green or blue 



reflections. 



I. Allied to the Lithosides in structure. Antennae pectinated to the 

 tips. Wings broad. Abdomen rather short, extending very little 

 beyond the hind border of the hind wings. 

 m. Abdomen more or less metallic. 



n. Hind wings partly red. fastuosa. 



nn. Hind wings bluish at the base. bella. 



I*. Body narrow, cylindrical. Wings long and narrow, covered with 

 opaque or limpid spots. Abdomen long, extending for half its 

 length beyond the hind wings. Resembles Syntomis. 



