112 DURHAM DIPTERA. 



XXIII. 189. 



2 (1). At least the middle legs yellow 



988. Hybos femoratus, Mull. 

 Wearhead, 3 $, August, 1901. 



190. Cyrtoma, Mg. 

 Life history unknown. 



1 (2). Hind metatarsi much thickened. (989. nigra, Mg.) 



2 (1). Hind metatarsi not thickened. 



3 (4). Wings blackish. Hind tibiae rather dilated. 



990. Cyrtoma spuria, Fin. 

 Harperley, 1 $, June, 1900; Bishop Auckland, 2 $, 

 June-August, 1902. 



4 (3). Wings grey {£) or colourless (?). Hind tibiae slender. 



Femora rather orange. (99 1. melcena, Hal.) 



191. Ramphomyia, Mg. 

 Life history not fully known. 998 has been found in earth. 



1 (50). Grey or black species. 



2 (43). Halteres pale. 



3 (32). Legs dark, black or brown. 



4 (18). Large species, 4-6 mm. Thorax distinctly striped. 



5 (8) (11). Thorax with two stripes. 



6 (7). Hind tibiae short haired or bare in the male. O. pro- 



duced nearly to the wing margin in the female. 



« (992. spissirostris, Fin.) 



7 (6). Hind tibiae long haired in both sexes. O. in the 



middle of the wing in both sexes. 



(993. dissimilis, Ztt.) 



8 (5) (11). Thorax with four stripes. 



9 (10). Legs not feathered. 



994. Ramphomyia nigripes, F. 

 Evenwood, 2 $, Harperley, 1 $, Wearhead, 1 ?, 

 June- August, 1 900-1 901. 



10 (9). Legs feathered in female. ( IOI 3- casta, Mg.) 



11 (5) (8). Thorax with three stripes. 



12 (17). Hind femora and tibiae simple in both sexes. 



