140 tho:mas say foundation 



parallel edges for about half the free length, then 

 curving forward to a straight apex, rather sickle- 

 shaped. Viewed from behind, the forceps are very- 

 thin, diverging slightly, and bear on the outer side 

 of the bend some long and rather delicate spines. Ac- 

 cessory plate curved, rather wide, the apex smooth 

 and darkened, with a few long hairs. Posterior clasp- 

 ers rather long, moderately stout, not very strongly 

 curved forward; anterior claspers rather stout and 

 erect, somcM^hat hooked at tip ; penis with yellow basal 

 segment well developed, the distal segment not very 

 long, in profile thin at base, becoming convex apically 

 behind so that the apical half is a globose, semi-trans- 

 parent hollow structure ; on each side of this there is a 

 light colored ear-like lobe at the apex; front side of 

 segment is decidedly concave with well marked rim. 

 Fifth sternite rather widely open, margin with a few 

 black hairs, lined with pale pubescence. Middle fe- 

 mur with a row of four or five bristles on the outer 

 front side. 



Female. Front .28 of head. Thorax with very 

 strong bristles. Genital segment red, with a heavy 

 row of bristles; fifth sternite almost straight on the 

 hind margin. The enclosed segment visible in a tri- 

 angular space from the center of which there arises 

 abruptly a slender round, sharp larvipositor grooved 

 behind and curved a little forward (Figs. 61a, 61b). 



Legs very bristly and femora uncommonly stout. 

 Fourth vein of wing ending in margin unusually far 

 before the apex, the distance being a little greater than 

 the fifth costal segment. The third vein rather sinu- 

 ous from the crossvein to its end, curving forward in 

 the middle of this segment. 



Twenty-two males and twenty-six females, all 

 from Colorado Experiment Station except one male, 

 which is from New Bedford, Mass. (Hough collec- 

 tion ) . 



Holotype. — Male, in Hough collection. 



Allotype. — Female, in Hough collection. 



