284 THOMAS SAY FOUNDATION 



when viewed from behind ; ps dc two large and two 

 small; ant acr barely differentiated from the coarse 

 hairs around them ; prsc one medium ; stpl three ; scu- 

 tellum with three pairs of marginals (intermediate 

 one small), one preapical, rather small, and no 

 apicals. 



Abdomen whitish-gray pollinose with conspicu- 

 ous tessellation; fourth segment almost entirely red 

 in ground color; first and second segments with only 

 lateral bristles; third with a median marginal pair; 

 fourth with a marginal row of about a dozen, dimin- 

 ishing on tlie sides; fifth sternite in the form of two 

 erect narrow lobes standing out from the abdomen, 

 not divergent, fringed with only moderate hairs, yel- 

 lowish-brown in color. 



Hypopygium yellow; first segment rather large, 

 yellow pollinose, with a row of 6 or 8 stout bristles 

 behind; second segment also with yellow pollen, glo- 

 bose, not very hairy; forceps reddish at base, the tips 

 becoming black ; viewed from behind they are slightly 

 divergent at the tips only and obliquely truncate, 

 with the inner side longest; in profile they are nearly 

 straight, widening a little near the tip and slightly 

 angulated on the hind edge, the apex turned slightly 

 forward; accessory plate yellow, of moderate size, 

 almost equilateral; posterior clasper slender, rather 

 straight, yellow at base with black tip; the figure 

 shows it turned to the side, a position which it nat- 

 urally assumes when the penis is protruded as far as 

 possible; anterior clasper much stouter, black, flat, 

 rounded, the tip turned outward, below it a rather 

 deep notch; penis with a very short basal segment 

 which would ordinarily be invisible; the distal seg- 

 ment long and complicated; its base is thick, then 

 deeply cut in on the front side and bearing laterally 

 a pointed flap at the narrowest place; beyond this is 

 a wide, complex transverse plate, apparently undi- 

 vided, of which the middle part forms a distinct black 

 point projecting forward; at some distance laterally 

 from this there is on each side a slender, sharp black 



