DURHAM DIPTERA. 245 



XXXIII. 



4 (3). Male fore femora not toothed; at least one of the 



foregoing characters absent in the female. 



5 (12). Eyes hairy. 



6 (7). Facialia ciliated. Polietes, Rnd. (449) 



7 (6). Facialia bare. 



8 (9). Arista plumose, or if very short haired, then the 



abdomen spotted. Hyedotesia, Rnd. (450) 



9 (8). Arista pubescent, or if short haired, then the abdomen 



not spotted. 



10 (11). Legs black. Trichopticus, Rnd. (463) 



11 (10). Legs pale. Allceostylus, Schnbl. (451) 



12 (5). Eyes bare, or slightly pubescent. 



13 (14). Proboscis with a moveable hook-like point bent 



backwards (VI. 29). Drymia, Mg. (461) 



14 (13). Lobes of proboscis broad, not moveable or hook-like. 



15 (16). Sides of the mouth thickly bearded with bristles. 



462. Pogonomyia, Rnd. (2038. alfiicola, Rnd.) 



16 (15). Mouth normally haired. 



17 (20). Arista plumose or subplumose ; thorax four-striped 



(occasionally the two centre stripes are run together : 

 S. platyptera and halterata) or all black. 



18 (19). Abdomen not spotted. Myd^a, Dsv. (452) 



19 (18). Abdomen spotted. Spilogaster, Mcq. (454) 



20 (17). Arista pubescent. 



21 (22) (23). Colour entirely yellow; V.1.a. bristly. 



Sphecolyma, Perr. (453) 



22 (21) (23). Colour shining blue-black, unspotted ; hind tibiae 



curved and ciliated. Ophyra, Dsv. (460) 



23 (21) (22). Colour grey, abdomen spotted ; thorax with 



three stripes. Limnophora, Dsv. (455) 



24 (2) (39). V.6. reaching the margin ; V.7. gently bent. 



25 (38). Eyes bare. 



26 (31). Arista plumose or subplumose. 



27 (28). Squamae moderate size, inner scale projecting behind 



the outer. Hydrophoria, Dsv. (464) 



28 (27). Squamae small ; scales equal or nearly so. 



29 (30). Body grey, marked or striped in the ordinary way. 



Hylemyia, Dsv. (465) 



