1 68 DIPTERA OF NORTH AMERICA. 



and unusually near the border of the mouth. Clypeus and cheeks 

 excessively narrow. Antennae black, the bristle with fine pubes- 

 cence to beyond the middle. Scutellum without marginal tuber- 

 cles ; the two small bristles on its tip rather distant from each 

 other. Wings in better colored individuals undoubtedly with much 

 gray clouding and blackish margins of the transverse veins, in the 

 neighborhood of which the surface of the wings is more glossy; 

 the second segment of the costa is only a fifth longer than the 

 third ; the ends of the third and fourth longitudinal veins with a 

 trace of a slight divergency ; the fifth longitudinal vein extends to 

 the border of the wing. 



This species is very similar to Parydra pusilla Meig. 



5. P. a'b'breviata Loew. % . (Translated from Berl. Entom. Zeitschr. 

 1861, p. 357, by R. Osten-Sacken.) — Minuta, antennis tibiisque ferru- 

 gineis ; alae infuscatae guttis aliquot hyalinis distinctissimis ornatse, 

 segmento costse tertio secundi longitudinem paulo excedente, venis lon- 

 gitudinalibus tertia et quarta distincte divergentibus. 



Small, antennae and tibiae ferruginous ; wings infuscated, with several 

 hyaline, very distinct dots, third segment of the costa somewhat exceed- 

 ing the second in length, third and fourth longitudinal veins distinctly 

 diverging. Long. corp. 0.07. Long. al. 0.07. 



Olivaceous. Antennae obscure ferruginous, the two first seg- 

 ments and the upper edge of the third, black ; the whole bristle 

 has a short pubescence above. Face moderately sloping, the or- 

 dinary bristle on each side is not more approximated to the peri- 

 stoma than in most of the congeners. Cheeks narrow. Scutellum 

 not tuberculated. Legs black, knees, tibiae and base of tarsi fer- 

 ruginous ; the whitish pollen, generally extant on the tibiae of the 

 allied species, is wanting here. Wings rather short, distinctly 

 infuscated, marked with seven rather large hyaline spots ; second 

 longitudinal vein with a very short, hardly perceptible appendage ; 

 third and fourth veins diverging near the apex ; second costal 

 segment almost equal in length to the third. 



Hab. Pennsylvania. (Osten-Sacken.) 



