FAMILY LOXCHOPTERID.E THE POIXTED-WING FLIES 



233 



TABLE OF SPECIES 



1. Bristles of the vertex and the orbital cilia wholly yellowish 4 



At least several of the upper orbital cilia black 2 



2. Bristles of the vertex black 3 



Bristles of the vertex yellowish; about half the orbital cilia black.... 4 



3. Wings very sharply pointed, very slightly concave posteriorly toward 



the apex, or at any rate not generally convex uniseta CuiTan 



Wings broader and much less sharply pointed, gently convex before 

 the apex occidentalis Curran 



4. Anal vein widely removed from the border of the wing; base of fifth 



vein with four or five long bristles borealis Curran 



Anal vein fused with the posterior border of the wing; base of fifth 

 vein with numerous setulae dubia Curran 



Wings of Lonchoptera. — 1. uniseta Curran; 2, 

 (Courtesy American Museum of Natural History.) 



occidentalis Curran ; 3, borealis Curran. 



