DESCRIPTION. 



Head black ; anterior orbits with a white line : 

 mystax cinereous ; vibrissa black ; stethidium 

 blue-black, with slight dark cinereous hair ; 

 wings, nervures widely margined with fuscous, 

 obscuring the anterior part of the wing, and 

 leaving the middle of the cellules on the inner 

 margin almost hyaline : feet black, tinged with 

 purplish, and with cinereous hair : poisers black- 

 ish, paler at base : tergum blue-black, with a 

 coppery or purple gloss. 



OBSERVATIONS. 



It was taken near Philadelphia. The back of 

 the abdomen, although of a dark colour, in a cer- 

 tain light reflects a brilliant coppery or purplish 

 tint. The short nervure which terminates at the 

 apex of the wing, is not only bifid at its origin, 

 as in the albibarbis, Meig., but the upper branch 

 joins the nervure above, as well as the lower 

 branch joins the nervure immediately below. 



Upper figure. 



PLATE VI. 



