234 THOMAS SAY FOUNDATION 



row of 12. Fifth sternite as in cooleyi, its basal part 

 black and rather sharply prominent, the arms with 

 heavy black brushes, of which the innermost bristles 

 are less stubby and longer. 



Hypopygium red; first segment rather large, 

 subshining, with a varying generally weak row of 

 hairs across apical part ; second segment globose, shin- 

 ing, without bristles; forceps stout, brown at base, 

 becoming black, tapering and curving forward to a 

 sharp point; accessory plate yellow, smallish, the 

 free part rather slender but not fingerlike; posterior 

 clasper small, brown, slender, the tip sharp and bent 

 forward, a stout hair arising from the basal front 

 side ; anterior clasper brown, polished, low, not hooked 

 at tip. Penis with yellow basal segment, the distal 

 one very wide and compact, ])lunt in profile; viewed 

 diagonally there are a pair of curved black horns at 

 the outer apical angles ; on the front side of the mid- 

 dle are a pair of lobes bearing teeth; the black back 

 plate has a pair of bubble-like thin whitish areas which 

 are conspicuous. 



Legs black; middle femur with comb; middle 

 tibia not villous, with three bristles on outer side; hind 

 tibia with very long and rather dense villosity spread- 

 ing both ways. 



Wings hyaline; no costal spine; third costal seg- 

 ment longer than fifth and sixth together; first vein 

 bare, third hairy for some distance. 



Female. Front .304 of head (average of five, — 

 .276, .290, .295, .320, .340) ; orbitals and outer vertical 

 present; beard as in male; no apicals on scutellum; 

 genital segment reddish yellow, with vertical slit 

 guarded by strong bristles above. 



Length 7% to 15 mm. 



Fifty-one males, fourteen females. One pair 

 taken in copulation and on same pin, were collected 

 at Lakeland, Fla., by Geo. G. Ainslie (National 

 Museum). The rest of the material is from Massa- 

 chusetts (New Bedford, Melrose Highlands, North 

 Saugus, North Andover) ; New York (Cold Springs 



