54 THOMAS SAY FOUNDATION 



submetallic gray pollen, leaving a distinct, shining 

 and metallic median black stripe; first and second 

 segments with only lateral bristles; third with a row 

 of 10 strong, erect marginals; fourth with a row of 

 10 or 12. Fifth sternite black, V-shaped, very incon- 

 spicuous, with slender, erect hairs on the exposed 

 edge. 



Hypopygium black, opaque, small ; first segment 

 with a row of small bristles behind ; second with erect 

 black hairs, hardly bristly, in profile rather humped 

 near base. Forceps small, black, straight, hardly di- 

 vergent, uniformly tapering. Accessory plate brown, 

 rather long, and narrow at tip; posterior clasper 

 small, slender, erect, blackish, with hooked tip and a 

 long hair from the base in front ; anterior clasper red- 

 dish toward tip, slender, rather sinuous. Penis with 

 short, brownish basal segment; distal segment black- 

 ish, its basal portion slender, then rapidly widening; 

 behind, it has a prominent angle, beyond which is a 

 concavity bounded by two spreading ridges wliicli 

 converge and blend in a rounded apex ; in front, there 

 is a mandible-like process and several pairs of small 

 hooks on the main part, suggesting the head of an 

 animal with open mouth. 



Legs black ; middle femur without comb ; middle 

 tibia with one bristle on outer front side; hind tibia 

 not villous, but ciliated on the outer side with several 

 rows of noticeable hairs. 



Wing subinfuscated in front and along the veins, 

 almost hyaline behind. 



Female. Front .268 of head (average of two, — 

 .263 and .274) ; with the usual ocellars and outer ver- 

 tical, but only 8 frontals; scutellum with the same 

 bristles as in the male, including apicals (in both 

 sexes the apicals seem to arise a trifle before the hind 

 edge) ; genital segments black, small. 



Length 8 mm. 



Three males and two females, Los Amates, 

 Guatemala, Jan. 16-20, 1905, collected by Professor 

 Jas. S. Hine. 



