146 DIPTERA OP NORTH AMERICA. [PART IV. 



sides, a tuft of long and soft hairs ; no verticils, above this pubes- 

 cence, are apparent (there are only 13 joints on both antennae of 

 my specimen, but the tip may be broken off). Palpi blackish ; 

 halteres with a somewhat infuscated knob, paler at the root ; feet 

 brownish ; coxae and basis of the femora brownish-yellow. Wings 

 uniformly grayish; the stigmatic region very slightly darker; 

 veins brown, comparatively slender ; discal cell open, confluent 

 with the third posterior cell ; seventh longitudinal vein slightly 

 sinuated in the middle, feebly divergent from the sixth. 



Eab. White Mountains, K H. ; a single male specimen, the 

 abdomen of which is broken. The peculiar structure of the 

 antennae of this species will render it easily recognizable ; they 

 must be remarkable for their length, if those of my specimen are 

 imperfect, as I have every reason to suppose they are. The size 

 of this species is about equal to that of the preceding ones ; it 

 could not be accurately given, on account of the broken abdomen 

 of my specimen. 



Gen. XVII. ERIOPTERA. 



Two submarginal cells ; four posterior cells ; discal cell present or absent. 

 Wings pubescent along the veins only. The second longitudinal vein usually 

 originates at a very acute angle, some distance before the middle of the 

 anterior margin ; the subcostal cross-vein is at a considerable distance 

 (two or three lengths of the great cross-vein, or more) from the tip of the 

 auxiliary vein. Antennae 16-jointed. Tibiae without spurs at the tip; 

 ungues smooth on the under side ; empodia distinct. 



The rostrum is short ; the palpi likewise ; their two intermedi- 

 ate joints rather stout. Eyes glabrous, separated above by a 

 broad front ; almost contiguous on the under side of the head. 

 The antennae are generally short, with oval or oblong joints ; in 

 some species, the males have the antennae longer than usual, 

 reaching, if bent backwards, beyond the basis of the abdomen ; 

 in such cases the joints of the flagellum are elongated and pedi- 

 celled. Thoracic suture well marked, often deep and glossy at 

 the bottom ; the longitudinal suture, connecting it with the scu- 

 tellum, is generally well marked. The feet are of moderate length, 

 comparatively short, usually pubescent, sometimes conspicuously 

 hairy ; the intermediate pair (as it was already noticed by Meigen) 

 is shorter than the two other pairs. Erioptera has this character 

 in common with the allied genera Bhypholophus, Trimicra, Sym- 



