134 THOMAS SAY FOUNDATION 



as the fifth and sixth together. Forceps compara- 

 tively long and strong, rather straight, not diverging 

 from each other except a little at the tip; near the 

 apex with minute granulations hehind, the tips sharp 

 and a little bent forward. Accessory plate rather 

 elongated, with dark tip bearing a few hairs. Pos- 

 terior clasper excised just before the apex in front; 

 anterior clasper very short and low with a hump be- 

 hind and a few erect hairs on the hind edge. Penis 

 with basal segment distinct, brown; distal segment 

 long, slender for half its length, rapidly enlarging at 

 apex, bearing on the back a pair of recurved hooks. 

 In front of these deeply hollowed out in a concavity 

 each side, separated by a central short keel. Fifth 

 sternite with a hea\y covering of short black spines 

 but not with a brush. 



Female. Front narrow, .22 of head (average of 

 four,— .205, .221, .221, .233) ; orbitals entirely want- 

 ing, as in masculin a. Agrees with the male just de- 

 scribed, but as usual in females the outer verticals are 

 well developed and the apical scutellar bristles, as 

 well as the comb on middle femur, are wanting. Fifth 

 and sixth sternites red, distinctly separated, the for- 

 mer hairy, the latter rather long, with broadly roimd- 

 ed tips, and numerous short, spiny bristles, which are 

 directed laterally along the sides. The (apparent) 

 fifth tergite is shining red, with a row of coarse black 

 hairs on the hind margin. 



Length 9 to 9.5 mm. 



Two males, four females, from Gove, Ellis, Rus- 

 sell, Thomas and Trego counties. Western Kansas, 

 all collected by F. X. Williams, and in the University 

 of Kansas collection. 



Holotype and Allotype. — Female and male re- 

 spectively, in the University of Kansas. Paratypes, 

 male and female, No. 20518, U. S. N. M. 



One female of still a third species without orbital 

 bristles was collected in New Mexico by Mr. Walton, 

 but without the male it would be unwise to give it a 

 name. 



