SARCOPIIAGA AND ALLIES 287 



part globose in front, with a distinct hump behind, 

 beyond this slender, with a lateral sharp lobe pointing 

 forward at each side; the back plate, during the re- 

 mainder of its course, is comparatively simple, rather 

 keel-like toward the apex, wliich is slightly notched 

 longitudinally. At about the middle of the front 

 side of the penis there is a complicated concave trans- 

 verse plate M^hich bears apically two black roughened 

 processes expanding laterally like wings. This struc- 

 ture is shown in the figiu'e standing out almost at 

 right angles to the body of the penis, but it is jointed 

 at the base and frequently lies more or less against the 

 front surface. 



Legs varying in color from black to red; the 

 tarsi, however, and usually the entire front legs are 

 black; middle femur with a very short but distinct 

 comb; middle tibia with a single bristle on the front 

 side ; hind tibia not villous. 



Wings hyaline; no costal spine; third costal seg- 

 ment about equal to the fifth; first vein bare; third 

 with coarse hairs almost to the crossvein. 



Female. Front .298 of head (average of five, — 

 .279, .288, .294, .299, .312), with the usual orbitals 

 and outer verticals. The median marginal bristles 

 of the third abdominal segment are often weak or 

 wanting. Genital segment yellow, pollinose above, 

 generally folding together so as to cover the remain- 

 ing parts which show no visible special structure. 



Length, 6.5-7.5 mm. 



Numerous males and females, mostly belonging 

 to the National Museum. One series of 11 specimens 

 from the C. V. Riley collection, Nos. 4285-8 and 

 4285-9, were reared from cow manure, August, 1889, 

 at Washington, D. C. 



The material was mostly collected around Wash- 

 ington, D. C, and La Fayette, Ind. There are, how- 

 ever, a male from Mexico City, January 4, 1915, R. 

 H. Van Zwalenburg, in the National Museum col- 

 lection, and a female from Lockbourne, Ohio, from 

 Professor Hine. A long series from Texas (C. F. 



