298 THOMAS SAY FOUNDATION 



from the extreme base, the tips strongly converging so 

 as to give an elhptical outhne. Accessory plate yel- 

 low with rounded end, not very prominent; posterior 

 clasper straight, erect, yellowish, with a pronounced 

 hook at the tip; anterior clasper very long, nearly 

 straight, the tip rather suddenly bent forward and 

 more slender, but not hooked ; penis with a single seg- 

 ment, very long and almost cylindrical, yellowish 

 changing to brown, the apical part bearing a trans- 

 verse divided plate pointing forward and just beyond 

 this on each side a shining black process which has a 

 point projecting forward along the plate and another 

 projecting outward to the apex, where it almost meets 

 a corresponding black hooded point arising from the 

 back plate. Viewed from behind the penis is narrow 

 nearly to the apex, then suddenly expands to about 

 twice its former width. 



Legs black ; middle femur with a pronounced 

 comb of flattened spines; middle tibia with a single 

 bristle on the outer front side; hind tibia without 

 villosity. 



Wing subhyaline, no costal spine; third costal 

 segment shorter than the fifth; first and third veins 

 each with a row of hairs. 



Female. Front .348 of head (average of five, — 

 .333, .342, .344, .345, .375); orbitals and outer ver- 

 ticals well developed; frontal stripe very wide; gen- 

 ital segment red, with rounded orifice guarded by a 

 few bristles ; middle femur without comb. 



Length 6-7% nmi. 



Numerous males and females, Pennsylvania, 

 South Dakota, Kansas, West Virginia, Georgia, 

 Florida, Texas. The Hough collection contains 

 about 1,500 specimens of this and the following spe- 

 cies. As indicated by the bibliography, this is a very 

 common excrement-feeding species. 



Holotype.— Male, No. 5395, U. S. N. M. 



