DURHAM DIPTERA. 297 



XXXIV. 



66 (65). Abdomen flat and much bent inwards, the segments 

 standing out like steps, with short soft hair and fine 

 marginal bristles. Coniosternum, Beck. (498) 



TABLES 0E SPECIES. 



485. Cordylura, Fin. 



1 (22). Four scutellar bristles. 



2 (3). Palpi yellow. {picticomis, Lw., ?) 



3 (2). Palpi black. 



4 (13). All tibiae and tarsi orange. 



5 (6). Shining black species without dusting ; third antennal 



joint black with rounded end; frons pale red; 

 wings yellow base. (rubifrontata, Beck., ?.) 



6 (5). Species more or less distinctly dusted. 



7 (8). Tarsi spotted with black on the under side; strongly 



dusted species. (2198. pubera, F.) 



8 (7). Tarsi on the under side not spotted with black. 



9 (10). Third antennal joint with rounded upper corner ; 



arista rather short haired ; femora with long white 

 hairs on the under side ; wings distinctly yellow ; 

 V.3. and V.4. diverging. (socialis, Beck.) 



10 (9). Third antennal joint with a sharp upper corner. 



11 (12). Arista distinctly long haired. (2196. pudica, Mg.) 



12 (11). Arista almost bare. (flavovenosa, Beck., $) 



13 (4). Tibiae either entirely or mostly black. 



14 (19). Tibiae all black. 



15 (16). Fore femora and tibiae in both sexes without long 



white hairs; a small species with distinct light 

 grey dusting, with rather brown wings, and six 

 supra-alar bristles. (atrata, Ztt.) 



16 (15). Under side of the fore femora and tibiae of the male 



with long white to black hairs. 



17 (18). Large shining black species, without the little 



acrostichal bristles; third antennal joint rounded 

 in front ; frons black ; abdomen with short de- 

 pressed hairs and long bristles. 



(2199. ciliata, Mg.) 



