DURHAM DIPTERA. 253 



XXXIII. 452. 

 452. Mydjea, Dsv. (see also page 256). 



1 (8). Legs wholly black. 



2 (5). Arista long haired. 



3 (4). Colour grey ; large species, 8 mm. 



(1977. allotalla, Mg.) 



4 (3). Colour black ; small species, 4-5 mm. 



1975. Mydcea vespertina, Fin. 

 Bishop Auckland, 1 $, May, 1902. 



5 ' (2). Arista short haired. 



6 (7). Hind tibiae with a strong erect blunt spine on the 



inner side near the tip. (1976. nigritella, Ztt.) 



7 (6). No blunt spine on hind tibiae ; abdomen with rather 



obscure dark spots. 



Spilogaster nigrinervis, Ztt. (1987) 



8 (1). Legs partly pale. 



9 (10). Thorax black. (1983. nigrkolor, Fin.) 



10 (9). Thorax grey. 



11 (20). Dorsum distinctly striped. 



12 (15). Scutellum wholly or partly yellow. 



13 (14). Scutellum entirely yellow, as well as all the femora. 



1 98 1. Mydcea pagana, F. 

 Wearhead, 1 $ and 1 $, August, 1901. 



14 (13). Bases of fore femora and base of scutellum black. 



1980. Mydcea tincta, Ztt. 

 Shull, 1 $, July, 1902. 



15 (12). Scutellum grey. 



16 (19). Fore femora partly nigrescent. 



17 (18). Tarsi of ordinary length ; third abdominal segment 



without bristles on the disc. 



1978. Mydcea urbana, Mg. 

 Hesleden, 1$ and 1 ?, August, 1900; Bishop Auck- 

 land, 3 ?, June, 1897-1901. 



18 (17). Tarsi very long ; third abdominal segment with 



numerous discal bristles. (longitarsis, Mde.) 



19 (16). Femora all pale. 



