DURHAM DIPTERA. 1 37 



XXIV. 223. 



18 (19). Legs all, or nearly all, black, only a pale dot at the 



base of the fore tibiae. 



1 195. Dolichoftis fiicipes, Mg. 

 Bedburn, 5 $ and 2 ?. I take these to be the species 

 meant by picipes in the British list, but if that name 

 is to be restricted to No. 12, flies with bristly hind 

 metatarsus, then this fly would be D. fastuosus, 

 Hal., and picipes would remain as at 12 above. 



19 (18). Legs black with yellow fore and mid tibiae. 



20 (23). Hind tibiae quite black, mid femora with only one 



praeapical bristle. A wart-like thickening at the 

 end of V.I. 



21 (22). Face yellowish, hind femora with a long blackish 



fringe. (1196. lepidus, Staeg.) 



22 (21). Face silvery white, hind femora without any fringe. 



(1196^. laticola, Verr.) 



23 (20). Basal half of the hind tibiae yellow, mid femora with 



two praeapical bristles, no thickening at the end of 

 V.I. ( XI 97- campestris, Mg.) 



24 (17). Fifth tarsal joint of the fore or mid legs enlarged. 



25 (28). Fifth yW tarsal joint enlarged. 



26 (27). Hind femora with a pale basal fringe beneath, fore 



and mid knees and middle joints of fore tarsi 

 reddish. (1198. falleni, Lw.) 



27 (26). Hind femora with short black fringe beneath, legs all 



black except the knee joints. 



(1199. melanopus, Mg.) 



28 (25). Fifth mid tarsal joint enlarged. Fore and mid tibiae 



pale. (1200. planitarsis, Fin.) 



29 (16). It is a female. 



30 (33). Fore tibiae dark, not more than the base and tip pale. 



31 (32). Fore tarsi all black, fore tibiae very narrowly pale at 



the base and tip. picipes, Mg. (1195 back) 



32 (81). Knees distinctly pale, fore tibiae and middle joints of 



fore tarsi light brown. (1198. falleni, Lw.) 



83 (80). Fore and mid tibiae yellow. 



