IIO DURHAM DIPTERA. 



XXIII. 



13 (12). 0.8. very prominent, springing from the base at 



almost a right angle. 



14 (15). Proboscis the length of the head, conical, and pointing 



downwards (VI. 20). Fore metatarsi usually much 

 thickened in the male. Hilara, Mg. (195) 



15 (14). Proboscis much shorter than the head, horizontal, or 



incurved. Fore tarsi not thickened in the male. 



16 (17). Antennas ending with a bristle. 



206. Gloma, Mg. (1107. fuscipennis, Mg.) 



17 (16). Antennae ending with a two-jointed style. 



18 (19). Proboscis incurved. 



194. Ragas, Mg. (1050. unica, Wlk.) 



19 (18). Proboscis horizontal. 



196. Oreogeton, Schin. (1075. flavipes, Mg.) 



20 (1). V. 3. not forked (V. 11, 12). 



21 (22). Fore coxae as long as the thickened fore femora. 



(208. Lepidomyia, Bigot. 

 "(209. Thamnodromia, Mik. 



22 (21). Fore coxae shorter than the fore femora. 



23 (36). O. absent (V. 12). 



24 (33). 0.6. absent. 



25 (26). Fore femora very much thickened and thorny beneath. 



Wings generally with dark bands. 



(Tachypeza, Mg. (213) 

 (Tachista, Lw. (214) 



26 (25). Fore femora not thickened. Wings withoutdark bands. 



27 (28). 0.4 1 as long as or longer than 0.5 1 . 



Chersodromia, Wlk. (217) 



28 (27). 0.4 1 shorter than 0.5 1 . 



29 (30). Last antennal joint lengthened — conical. 



216. Elaphropeza, Mcq. (n 29. ephtppiata, Fin.) 



30 (29). Last antennal joint short — oval or round. 



31 (32). Arista terminal. Drapetis, Mg. (211) 



32 (31). Arista dorsal (III. 27). Stilpon, Lw. (212) 



33 (24). 0.6. present. 



34 (35). Antennae with a terminal bristle. Fore and mid 



femora much thickened, and generally thorny 

 beneath. Tachydromia, Mg. (218) 



