290 DURHAM DIPTERA. 



XXXIV. 



.TABLE OP GENERA. . A . 



1 (38). Prothoracic bristle, and generally also the stigmatical 



bristle distinctly present, seldom only represented 

 by fine hairs or absent, in which case the dorsum 

 is also almost without bristles, though with short 

 stubbly hairs. 1-3 sternopleural bristles present ; 

 1-5 dorso-central bristles ; 2-4 scutellar bristles ; 

 wings generally short, and rounded off in front. 



2 (35). Under side of the fore femora and tibiae with, at 



most, a single row of bristles. 



3 (31). Face long; palpi slender (filiform), with or without 



long end bristles, seldom much widened ; antennae 

 of varying length and breadth ; arista plumose to 

 bare ; mostly very bristly species. ■ ■ 



Sub-Family I. — Cordylurin^e. 



4 (28). Palpi small, filiform. 



5 (12). Palpi with one long end bristle ; only one sterno- 



pleural bristle. 



6 (11). Third antennal joint short, the second extending more 



or less cap-like over the third. 



7 (10). Arista plumose, short haired, or strongly pubescent; 



costa strongly ciliated ; V.3. straight or only 

 slightly bent. 



8 (9). Arista much thickened at the base, becoming suddenly 



thinner, plumose to the middle, rarely pubescent ; 

 femora and tibiae strongly bristled; five dorso- 

 central bristles ; face narrowed at the antennae ; 

 black species, seldom yellow, shining and but 

 slightly dusted. Cordylura, Fin. (485) 



9 (8). Arista very thin, and scarcely thickened at the base, 



from shortly and thinly haired to long haired ; 

 femora and tibiae very slender and long, only 

 slightly bristled; only from one to three distinct 

 dorso-central bristles, seldom five ; face and frons 

 nearly of equal breadth ; yellow and black coloured 

 species. Parallelomma, Beck. (486) 



