102 [October, 



other, that it is very difEcult to define them accurately. I have referred a single 

 specimen to the present species, which I found in June, 1880, on very high gi'ound 

 on the borders of Rombald's Moor in Yorkshire. 



L. 7-KOTATA, Zett. 

 This pretty little fly is the only one in the genus which is widely diffused, or at 

 all common in England. I have found it both in Yorkshire and in the south. All 

 the male specimens which I have seen belonged to the h. var. of Zetterstedt, having 

 the alulets fuscous ; a female which I captured together with a male in Askhani Bog, 

 near York, in September, 1880, had the alulets white, while those of the male were 

 black. 



6. HTDEOPHOEIA, Desv. 



Gen. ell. — Eyes bare, contiguous or sub-contiguous in male ; arista 

 plumose or sub-phmiose ; alulets o£ moderate size, with the lower 

 scale longer than the upper ; abdomen conical, without distinct spots, 

 and with projecting sub-anal appendages in male ; anal vein prolonged 

 to posterior margin of wing. 



Sect. 1 — Lefjs entirely hlacTc. 

 1. AMBiGUA, Fall. I 2. DivisA, Mcig. 



3. CAUDATA, Zett. 



Sect. 2 — Legs partly pale. 



4. CONICA, "Wdm. 



5. BEUNNEIFKONS, Zett. 



coronala ?, Zett. 



G. LINOGEISEA, Mcig. 



7. ANTIIOMYIEA, Eoud. 



8. sociA, Fall. 



This genus is closely allied both to Mydcea and Hylemyia. It 

 differs from the former by the species having the anal vein prolonged 

 more or less distinctly to the margin of the wing, and by the abdomen 

 being usually conical rather than oval, and furnished beneath in the 

 males with lai-ge sub-anal appendages. It is distinguished from Hy- 

 lemyia, to which it has been united by Schiner, by its higher degree of 

 organization ; the alulets in the principal species being of considerable 

 size, and always with the scales of unequal length ; while in Hylemyia 

 they are small, and the lower scale is always covered by the upper one ; 

 the abdomen also in the latter genus is usually cylindrical rather than 



conical. 



H. AMBIGUA, Fall. 



H. DiTisA, Meig. 



These species have been confounded together, though they are really very distinct. 

 This confusion has arisen from their bearing a good deal of general resemblance, and 

 from having been too briefly and imperfectly described ; so that the description of 

 one will apply almost as well to the other. Fallen's H. amhigua is apparently more 

 rare than Meigcn's //. dlvlsa, though neither is common. 



