108 THOMAS SAY FOUNDATION 



Abdomen black, rather silvery pollinose, tessel- 

 lated, not striped. First segment with only lateral 

 bristles; second and third segments each with a very 

 large pair of median, erect bristles; fourth segment 

 with a row of about 18 marginal bristles; an erect pair 

 of still larger submarginals. 



Hypopygium blackish; first segment of moder- 

 ate size, subopaque, becoming red at lower edges, 

 with a row of bristles near the hind margin; second 

 segment concolorous, globose, with several scattered 

 erect bristles; forceps flat, straight, shining black; 

 uniformly taj^ering, the tips rather blunt and not at 

 all divergent, near the basal outer angle with long 

 bristles sloping back; accessory plate small, triangu- 

 lar; posterior clasper excised near tip, on outer side 

 with a long hair ; anterior clasper black, smooth, rather 

 spoon-like at apex; penis w^th basal segment, very 

 wide in profile; apical segment enlarging from the 

 beginning, broad and black, with two widely separ- 

 ated horn-like points at tip, on front side in the mid- 

 dle a funnel-like protuberance with several little 

 points above and below it; fifth sternite with a V- 

 shaped excision which bears a very delicate black 

 brush. 



Legs black; middle femur without comb; middle 

 tibia with three bristles on outer front side, the inter- 

 mediate one strikingly large; hind tibia without vil- 

 lositv. 



Wings subhyaline; costal spines well developed; 

 third segment of costa shorter than fifth; first and 

 third veins with rather large hairs; hind crossveins 

 very straight and less oblique than usual. 



Female. Front .351 of head, with the usual two 

 orbitals; outer vertical present; lateral edges of scu- 

 tellum ornamented precisely as in tlie male, the brush 

 of wliite hairs with brown basal part extends from the 

 base to the second marginal, near the tip; first mar- 

 ginal rather on the upper surface, as usual ; a pair of 

 small apicals just as in the male; genital segment hid- 



