132 DURHAM DIPTERA. 



XXIV. 



45 (46). First antennal joint distinctly haired above. 



Argyra, Mcq. (233) 



46 (45). First antennal joint bare above. 



234. Leucostola, Lw. (1284. vestita). 



47 (44) (48). Abdomen depressed, face contracted below the 



antennae, but widening towards the mouth, legs of 

 the male often of peculiar build ; small species, 

 1-3 mm. Campsicnemus, Wlk. (247) 



48 (44) (47). Abdomen compressed, face either equally wide, 



or narrowed towards the mouth ; 1-2^- mm. 



49 (50). Frons metallic, costa of the male with a long black 



swelling from the end of V.I. a. to V.l.b. 



Teuchophorus, Lw. (249) 



50 (49). Frons not metallic, male costa not thickened, third 



hind tarsal joint in the male with a brush of hairs. 



Sympycnus, Lw. (250) 



51 (16) (43). Acrostichal bristles absent. 



52 (55). Small species, 1^-2 mm ; palpi not large. 



53 (54). Abdomen yellow and black, male organ obvious, 



appendage thread-like. 

 255. Anepsiomyia, Bezzi. (1361. flaviventris, Mg.) 



54 (53). Body all olive green, male organ concealed, wings 



much narrowed at the base in the male. 



248. Ectomus, Mik. (1347. alpinus, Hal.) 



55 (52). Large species, 3-6 mm. Proboscis thick and 



prominent, and covered with the great broad 

 palpi. Thinophilus, Whlbg. (257) 



56 (4). X.5. far beyond the middle of the wing, and so near 



the margin as to be as long as or longer than the 

 last section of V.5, 



57 (60). Fore femora thick and bearing spines at least in the 



male. 



58 (59). First antennal joint long, fore tibiae with a thorn-like 



process at the end, wings with a prominent dark 

 mark on the fore margin, fore femora with long 

 spines. Scellus, Lw. (243) 



