August, 1912.] 177 



13 (12). Legs dark brown to almost black, Hypopygium bristly, or at least with a 



long hair or two at each corner {alticolella). 



14 (15). All the joints of the fore-tarsi yellow in both sexes. Hypopygium without 



bristles, only with a long hair or two on each side. 



...l^-lf mm. alticolella. 



15 (14), The whole tarsus, or at least the metatarsus dusky. Hypopygium strongly 



bristled. 



16 (17). Wings tinted. Legs brown or dark brown; hind femora of male thickly 



fringed beneath with short and stubby hairs. Hypopygium with three 

 or four bristles at the corner and as many more diagonally on the side. 



...Ij-lf mm. humilis. 



17 (16). Wings clear. Legs black or nearly so ; the hairs underneath the hind 



femora of ordinary character. Hypopygium with only the corner 

 bristles l^li mm. hyalipennis. 



Fore-tarsi slender, or at least not strikingly thickened. 



Mesopleurae with one very large and conspicuous bristle, beside the 

 ordinary ones. 



Costa to middle of wing. Legs yellow tinged with grey. A largish species. 



. . . 1 1-2 mm. fungivora. 



Costa considerably short of wing middle. Legs black. A small species. 



... about 1 mm. pectoralis. 



Pleurai without such bristle. 



Large species — 2 mm. and over. Tibial cilia strong and sparse. 



...2^2 mm. Beckeri. 



Small species — 1 myn. or rather more. Tibial cilia at most of moderate 

 size. 



First costal division greatly longer than the other two — two to three times 

 as long. Metatarsi and lower end of tibise of hind pair of legs 

 thickened 1 mm. clavipes. 



First costal division not greatly longer — at most half as long again. Meta- 

 tarsi and tibise of hind legs simple. 



Upper supra-antennal bristles not outside an alignment with inner bristles 

 of middle frontal row ; bristles of lower frontal row not approximated. 



Wings clear; thin veins fine and delicate. Hypopygium with a long 

 conspicuous bristle on each side barely 1 mm. nigripes. 



Wings yellowish brown ; veiria strong and distinct. Hypopygium without 

 bristles, but attached to sub-anal body a curious claw-like yellow 

 process with its point directed forward. 



... 1 mm. or a trifle more, unguicularis. 



30 (27). Upper supra-antennal bristles outside such alignment; bristles of lower 



frontal row approximated. 



31 (32). Supra-antennal bristles small, under ones minute. Costa fully to wing 



middle. Hypopygium bare, very large and globular, and with a long 

 yellow process underneath, much as in imguicularis. 



...barely 1 mm. barbulata. 



32 (31)'. Supra-antennal bristles large and nearly equal. Costa considerably short 



of wing middle. Hypopygium of ordinary shape and bristly. 



...1-1^ mm. hirsuta. 

 O 



