isra.] 49 



Head lilack. mouth browiiisli. palpi hrownish-yellow. their tip hhick ; an- 

 tenuw pale ferruginous; branches brownish gray, in three rows, the interme- 

 diate row being the shortest. Thorax ferruginous, shining above ; hardly any 

 vestiges of stripes are perceptible : the membrane between the root of the wings 

 and the coUare dingy-yellow. Ilalteres yellow. Feet pale ferruginous: tips 

 of the femora slightly brownish ; the extreme tips of the tibipe. including the 

 spurs, brown: tarsi pale brownish, the extreme tips of the ?,d and 4th joints 

 are l)rown : last joint dark brown. (The foremost feet are wanting in my only 

 specimen.) Abdomen ferruginous, a Idack dorsal stripe of rather indefinite 

 outline, begins at the second segment and ends at the base of the large, club- 

 shaped male genitals, which are entirely ferruginous ; this stripe occuj)ies how- 

 ever only the middle of the dorsal segments, the sides of which are ferrugi- 

 nous. Wings altogether hyaline, even the space between the costa and the 

 first longitudinal veins is without any tinge; veins yellow at the basis of the 

 wings, black on the remainder of their surface; stigma brown : the 2d and 3d 

 veins are distinctly diverging towards their tips, so that the distance between 

 these tips is somewhat larger than that between the tip of the .Sd longitudinal 

 and of the following vein. 



Hah. Massachusetts (Sanborn). 



Obsi' rent ion I. — I possess an imperfect specimen of a female, which 

 may belong to this species. Although the body is differently colored, 

 the hyaline wings, yellowish at the basis, and the direction of the 2d 

 and od longitudinal veins aiford strong points of analogy. I incline to 

 believe that G. front<il!>^. like (\ fopazi'na, varies in its coloring from 

 black to ferruginous. I let the description of this female follow : 



Head and thorax black, shining; palpi tawny at the base, the last joints 

 black: antennae brown: first joint black above: the third joint (first joint of 

 the flagellum) is about half the length of the first, incrassated towards the tip 

 on its upper side and therefore, clavate : fourth joint linear, somewhat longer 

 than the third: the fifth joint also linear, about | of the fourth: the 6th still 

 shorter; the 7th and the following are subelliptical. the three penultimate 

 joints subglobular. The membrane between the root of the wings and the col- 

 lare is yellow. Halteres yellow. Fore coxae black, clothed with pale hairs, 

 their extreme tip and the trochanters ferruginous ; middle and hind coxae pale 

 ferruginous, black at the extreme basis ; femora ferruginous, the extreme tip 

 brownish above: tibife dark tawny, paler on the inside; foremost tarsi dark 

 brown; the first joint and the extreme basis of the second joint pale brownish. 

 (The other tarsi, as well as the abdomen, are wanting.) Wings as in the male. 



Bab. Ohio (Capt. Holden.) 



Ohxervation TI. — It is not impossible that this is 6'. Kurrfdrns Walk., 

 although the description of this species in the Diptera tSaaia/n-.'o'aiia 

 is too unmeaning to admit of any conclusion, the more so. as Walker 

 describes only the female. 



