168 DIPTERA OF NORTH AMERICA. [PART IV. 



along the orbits of the eyes ; antennae and palpi blackish-brown ; 

 the space occupied by the usual stripes on the mesonotum is 

 brownish, with three dark brown lines ; the intermediate one is 

 especially distinct ; the lateral ones are curved anteriorly and 

 extended beyond the suture posteriorly ; the humeral region is 

 yellowish ; pleurae hoary below, with a brown stripe between the 

 collare and the root of the halteres ; metathorax brownish, with 

 a hoary bloom ; halteres yellowish, sometimes infuscated ; feet 

 brownish, tip of the femora broadly, tip of the tibiae only a little 

 infuscated ; abdomen brown, the lateral margins, as well as those 

 of the single segments, paler ; forceps of the male reddish. 

 Wings slightly tinged with brownish ; cross-veins with hardly 

 perceptible brownish clouds. 



Hab. Washington, D. C. ; New Eochelle, K Y. ; Newport, 

 R. I. ; in June, also in August and September ; always near 

 water. 



Gen. XIX. CHIOWEA. 



No ivings. Antennae 6-jointed, structure abnormal ; feet stout, hairy ; 

 abdomen short ; last segment very large, subglobular, inclosing the basis 

 of the forceps ; the latter comparatively large and strong, with strong 

 claw-shaped appendages ; ovipositor pointed ; the upper and lower valves 

 divaricated at the basis. 



Head rounded, front convex ; rostrum short ; palpi with four 

 short joints ; first joint of the antennae cylindrical, elongated ; 

 the second of equal length, club-shaped at the tip ; the third 

 short conical ; the remainder of the antenna slender, filiform, 

 with three joints -, 1 joints of the scapus pubescent, those of the 

 fiagellum with rather long verticils. Thorax comparatively 

 small ; the transverse suture visible at the sides only ; scutellum 

 short and broad ; last abdominal segment very large, rounded on 

 the under side, inclosing the basis of the forceps. Feet stout, 

 comparatively long, hairy ; coxae large ; the hindmost femora 

 (according to Dr. Harris) are very thick and somewhat bowed in 

 the males ; tibiae without spurs at the tip ; empodia distinct ; 

 ungues smooth ; the fourth joint of the tarsi is somewhat in- 

 crassated on the under side, at the basis. Halteres short, with 



1 For the number of antennal joints I rely upon Dr. Schiner {Fauna 

 Austr. Dipt. II, p. 573), who had seen living specimens. It seems to me 

 that I can count four joints in the only specimen in my possession. 



