OF WASHINGTON. 81 



Abdomen nearly black. Legs brown, mealy; the hind tibia plainly 

 fusiform, one and one third times as long as femur ; tarsi short. Wings 

 'dark, mealy (when not rubbed), the extreme outer margin of fore 

 pair often pale. Venation as figured, the veinlet connecting subcosta 

 and radius about its length or more beyond the veinlet closing discal 

 cell; no cros,s-vein between first and second anal veins. In hind wings 

 the venation is very similar to that of fore pair; the hind wings in 

 both sexes reaching beyond discal cell of fore wing. The apical and 

 posterior margins in both pairs are minutely ciliate. The abdomen of 

 male is very short, and ends as in figure; in female it is nearly twice 

 as long and swollen in the middle. 

 Length, 2.6-72.9 mm. 



I have specimens from Sea Cliff and Hamburg, N. Y. ; 

 Lakehurst, N. J. ; Plummers Island, Maryland, and Falls 

 Church, Va. I have examined Hagen's type in the Museum 

 of Comparative Zoology; it has outer margin of forewings 

 pale ; it is from Washington, D. C. This is our most common 

 species. 



Coniopteryx angustus, n. sp. (PI. VII, fig. 8). 



Very similar to C. vicina, but the fore wings are more elongate and 

 slender, the apical margin not pale. Venation like C. vicina, except 

 that the veinlet connecting subcosta and radius is fully three times its 

 length beyond that closing the discal cell; and that the forks of the 

 radial sector are longer. In the male the upper genital appendage 

 tapers toward tip, while in C. vicina it is rather clavate. 



Length, 3 mm. 



Specimens from Claremont, Cal. (Baker), and Williams, 

 Ariz. (Barber and Schwarz), U. S. N. M. 



Genus PARASEMIDALIS Enderlein. 



Parasemidalis Enderlein, Wein. Ent. Zeit., 1905, p. 197. 



Similar in many respects to Malacomyza, but with rather larger front 

 wings and more slender, while the hind wings have both the radial 

 sector and the median vein forked, and reaching to the posterior margin. 



Type: P. anncz Enderlein. 



Parasemidalis flaviceps, n. sp. (PI. VII, fig. 9). 



Head yellow; antennae yellowish, of about 38 joints; thorax and 

 abdomen dark; legs brown, mealy; hind tibia slightly fusiform, not 

 one fourth longer than femur, tarsi rather long, the basal joint longer 

 than usual. Wings dark, mealy; venation as figured, the cross-vein 

 connecting subcosta to radius is about twice its length beyond that 

 closing the discal cell; the cross-vein from median to cubitus is oblique 



