238 Saifs Descriptions of 



Approaches a little to the genus Helwigia by the 

 form of its antennse. I found one specimen in Pennsyl- 

 vania and another in this State. 



13. C. micropterusy^ . Black; feet and middle of 

 the abdomen rufous ; wings abbreviated. 



Inhabits Pennsylvania, 



Body black : antennce^ honey-yellowj with a paler 

 yellow annulation : j^alpi whitish : wings not reaching 

 the tip of the metathorax : metathorax concave behind ; 

 posterior angles a little prominent: tergum polished, 

 suboval ; first segment black ; second and third honey- 

 yellow ; remaining segments black : oviduct half the 

 length of the abdomen : feet honey -yellow^ paler at their 

 origin; posterior pair of thighs and tibise each at tip 



blackish. 



Length one fifth of an inch* 



This seems to be related to C. alhreviatuSy Fabr. but 



it has no " striga alba.'' 



OphioNj Fabr. 



1. O. purgdtus. Honey-yellow ; two opake dots in 

 the first cubital cellule. 



Inhabits Indiana. 



Body pale honey -yellow, somewhat sericeous : an- 

 tenna rather longer than the body: orbits yellow, dilated 

 before, so as to occupy the greater part of the hypostoma : 

 ocelli large, prominent: wings hyaline; stigma slender ; 

 first cubital cellule with two opake, subtriangular spots ; 

 second cubital cellule none : metathorax with a single, 

 raised, rectilinear, transverse line, near the base. 



Length about seven tenths of an inch. 



This is much like an insect sent me bv Mr. Winthem 



