312 DURHAM DIPTERA. 



XXXVI. 506. 



38 (33). Ends of the long veins quite clear. 



39 (40). Costal spines very short. 



2264. Helomyza zetterstedti, Lw. 

 Shipley, 3 ?, July-September, 1900. 



40 (39). Costal spines long. 



41 (42). Jowls unusually narrow ; scutellum without hairs. 



2263. Helomyza montana, Lw. 

 Shipley, 1 ?, July, 1900. 



42 (41). Jowls of the usual breadth ; scutellum with scattered 



hairs. 



2265. Helomyza pallida, Fin. 

 The commonest species. Bishop Auckland, 5 $ and 

 6 ?, June-July, 189 7-1 901. 



43 (32). Arista with at most a short pubescence, almost bare. 



44 (45). Scutellum very hairy. {imivittata, v. Rossi.) 



45 (44). Scutellum almost bare. 



46 (47). A brown spot between antennae and eyes. 



ustulata, Mg. (2262 above) 



47 (46). No brown spot. 



48 (49). Legs entirely yellow or brownish yellow. 



(parva, Lw.) 



49 (48). Greater part of the fore femora and the ends of the 



feet black. (femoralis, Lw.) 



510. ECCOPTOMERA, Lw. 



1 (6). Thorax yellow. 



2 (3). X-veins clouded. (prnata, Lw.) 



3 (2). X-veins not clouded. 



4 (5). The red third antennal joint only brownish at the 



point. (longiseta, Mg.) 



5 (4). The third antennal joint black. {filata, Lw.) 



6 (1). Thorax grey. 



7 (12). Abdomen all red or yellow. 



8 (11). Hind femora with a black spot at the tip. 



9 (10). Stigma short ; upperside of hind femora with only 



one bristle near the tip. {niicrops> Mg.) 



