TEUCHOLABIS. 129 



Hob. Delaware (Dr. Wilson) ; District Columbia (?). I am 

 not quite sure of the latter locality. 



Observation. I have for comparison two males and a specimen 

 without abdomen, which is probably a female, as its antenna? are 

 somewhat shorter. 



Gen. XIV. TEUCHOLABIS. 



One submarginal cell ; four posterior cells ; a discal cell ; first longi- 

 tudinal vein very short, its tip being but little beyond the middle of the 

 length of the wing, nearly opposite or not much beyond, the inner end of 

 the submarginal cell (Tab. I, fig. 12). Wings very hyaline, stigma 

 rounded. Antennae 16-jointed. Rostrum cylindrical, distinctly pro- 

 longed, although shorter than the head. Collare prolonged in a narrow, 

 linear neck. Feet rather stout, hairy ; tibiae without spurs at the tip ; 

 empodia distinct, but small. Genitals of the male hairy on the outside ; 

 forceps with large, horny appendages and an anal style (Tab. Ill, fig. 9). 



Eyes glabrous, more or less remote above, almost contiguous 

 below. Palpi short, inserted at the tip of the short, cylindrical 

 rostrum ; last joint very short. The elongated, neck-like collare, 

 although shorter than the head, is a very striking feature of this 

 genus. Antennae of moderate length ; if bent backwards, they 

 would not quite reach the basis of the wings ; scapus of the 

 usual structure ; flagellum with oblong or rounded, well-separated 

 joints, clothed with a short pubescence and with verticils, which 

 are a little longer than the pubescence. 



Feet of moderate length, comparatively short and rather stout, 

 clothed with a rather long and dense pubescence ; ungues appa- 

 rently smooth ; empodia small, but very distinct. 



The forceps of the male consists of two oblong lobes, somewhat 

 like those of Dicranomyia : large horny appendages on their 

 under side ; anal style distinct (Tab. Ill, fig. 9, represents the 

 forceps of T. complexa from above ; fig. 9 a, one-half of it, from 

 below) ; in dried specimens none of these organs are perceptible. 

 The tip of the abdomen is hardly incrassated, but always hairy. 

 The valves of the ovipositor are of moderate length, slender, 

 arcuated. 



The wings (Tab. I, fig. 12, wing of T. complexa) are com- 

 paratively short, often broad ; they are very transparent and the 

 microscopic pubescence, common to all the wings of Diptera, 

 seems to be more coarse and scattered here, as a moderate mag- 



9 August, 1868. 



