244 THOMAS SAY FOUNDATION 



well forward on the bucca; ocellars present, outer 

 vertical absent. 



Thorax with gray pollen and the usual three to 

 five black stripes; ps dc 4, the anterior two smaller 

 but of fair size; ant dc 2 larger; ant acr rather long 

 but hairlike, not really differentiated; prsc smallish; 

 stpl three on one side and four on the other in the 

 single specimen; scutellum with the usual two mar- 

 ginals, one small preapical and one small apical, and 

 in addition with a small pair before the second mar- 

 ginals. 



Abdomen gray pollinose with median black 

 stripe and a pair of shifting lateral ones; first and 

 second segments with only lateral bristles ; third seg- 

 ment with a strong erect pair of median marginals 

 and three laterals; fourth segment with row of 12 or 

 14 marginals. 



Hypopygium black; first segment pollinose, 

 rather large and curved downward, with a row of 

 small bristles behind; second segment moderately 

 large, globose, sub-pollinose, with erect hairs ; forceps 

 black, slender, the tips broken off in the only speci- 

 men; accessory plates very large, brown, triangular, 

 with the sides a little curved; they are not separated 

 from the body of the second segment by a membrane 

 in the usual way, but connect closely. Claspers black- 

 ish, slender, not much cur^^ed, the anterior ones with 

 a row of hairs on the back; penis very slender and 

 long, the basal segment yellow ; distal segment brown, 

 rather compact in shape, with no noticeable external 

 parts except a recurved lobe or hook in front. Fifth 

 sternite inconspicuous, deeply excised and V-shaped, 

 not with brushes or stout bristles. 



Legs black; middle femur not with comb; mid- 

 dle tibia with one bristle on the outer front side ; hind 

 tibia not at all villous. 



Wing hyaline; no costal spine; third costal seg- 

 ment longer than fifth; first vein bare, third with 

 coarse hairs nearly to crossvein. 



Length 7l^ mm. 



