380 DURHAM DIPTEEA. 



LVI. 658. 



658. Limosina, Mcq. 



Larvae have been found among confervas, in diseased 

 potatoes, &c. 



1 (2). V.5 2 slanting so much backwards that it looks like a 



continuation of V.4, ; 0.5 2 pointed at its outer 

 end; hind margin of the wing notched, with ten 

 bristles resting on the wing disc in the male. 



(2801. acutangula, Ztt.) 



2 (1). X.5 2 nearly at right angles to V.5. ; 0.5 2 blunt at its 



outer end. 



3 (4). V.3 2 distinctly twice bent, almost looped above X.5 2 ; 



the fourth abdominal segment in the male with a 

 long curved tuft of hair at each side. 



(2814. sylvatica, Mg.) 



4 (3). V.3. straight or gradually bent up. 



5 (12). Scutellum with hairs or small bristles on the disc in 



addition to the strong marginal bristles. 



6 (9). Disc of scutellum with distinct short bristles. 



7 (8). Dorsum and scutellum brownish red ; abdomen dark 



brown ; legs orange ; the upperside of the femora 

 and the tips of the tibiae black. 



(2803. ferruginata, Stnh.) 



8 (7). Dorsum and scutellum black, sometimes rust-brown ; 



abdomen black ; legs pitchy brown. 



(2804. foiscifiennis, Hal.) 



9 (6). Disc of scutellum only pubescent. 



10 (11). C 2 twice the length of C 3 ; wings brownish yellow ; 



halteres yellow. (2802. vagans, Hal.) 



11 (10). C 2 equal to C 3 ; wings blackish ; halteres dark. 



(2800. lugubris, Hal.) 



12 (5). Scutellum bare on the disc. 



13 (14). Wings very short, not extending to the end of the 



abdomen. (2819. nivalis, Hal.) 



14 (13). Wings normal, extending beyond the abdomen. 



15 (42) (43). Face black or grey. 



16 (23). C 2 twice as long as, or much longer than C 3 . 



