DURHAM DIPTERA. 357 



XLIX. 615. 



5 (6). Face silver white ; jowls without bristles. 



(2649. sorbillans, Hal.) 



6 (5). Face not silver white ; jowls with a distinct bristle. 



7 (10). The clear mark between V.2. and V.3. large and 



broad. 



8 (9). Dorsum grey with an indistinct dark centre stripe. 



(2650. csstuans, Hal.) 



9 (8). Dorsum grey with four yellow stripes. 



(2653. noctula, Mg.) 



10 (7). The clear mark between V.2. and V.4. small and 



narrow. 



11 (12). Legs entirely black ; blackish brown species ; face 



distinctly haired and ciliated, and bearing beneath 

 the corner of the eye a very strong upward 

 directed bristle. (2651. stagnalis, Fin.) 



12 (11). Knees and metatarsi orange ; yellowish grey species ; 



facial hairs weaker, and with three erect side 



bristles instead of the one strong one. 



(2652. lutosa, Hal.) 



616. Scatophila, Beck. 



1 (2). Halteres black-brown ; dark brown species. 



(2655. cribrata, Stnh.) 



2 (1). Halteres pale ; greyish brown species. 



3 (4). Face in profile convex ; a strong erect bristle at the 



corner of the mouth. (2656. desfiecta, Hal.) 



4 (3). Face in profile concave, and without the mouth 



corner bristle. (caviceps, Stnh.) 



Family L— DROSOPHILID^E. 



The larvae mostly live in decaying vegetable matter ; some 

 are leaf miners. 



TABLE OP GENERA. 



1 (10). X.5 1 absent. 



2 (9). Arista plumose, or combed on the upper side. 



3 (4). Costa ending at V.3. 



619. Leucophenga, Mik. (2559. maculata, Duf.) 



