210 Proceedings of the Biological Society of Washington. 



backwardly directed bristle near tip of each. Fore tibia with a weak median 

 posterior bristle, the preapical bristle longer than usual; mid femur with 

 some short an tero- ventral and a number of longer postero- ventral bristles; 

 mid tibia with the posterior bristles weak; hind femur with a series of long 

 very closely placed bristles from base to apex on antero-ventral surface, 

 the hairs on anterior surface strong and erect, the postero-ventral surface 

 with short, hair-like bristles from base to apex; hind tibia stouter than usual, 

 furnished on all surfaces with erect short hairs, one fine postero-dorsal 

 bristle about one-third from apex, and an unusually long apical dorsal 

 bristle. Costal thorn very small; veins 3 and 4 slightly convergent. 



Length, 4 mm. 



Type, Plummers Island, Md., April 17, 1912 (W. L. McAtee). One male. 



Distinguishable from any species of the genus known to me by the very 

 characteristic bristling and hairing of the hind femora and tibiae. 



