DURHAM DIPTERA. 315 



XXXVII. 



Family XXXVII.— HETERONEURID^E. 



1 (2). Hind tibiae with a praeapical bristle. 



Heteroneura, Fin. (514) 



2 (1). Hind tibiae without a praeapical bristle. 



515. Stomphastica, Lw. (2286. flava, Mg.) 



514. Heteroneura, Fin. 



1 (2). Dorsum and pleurae orange. (2283. albimana, Mg.) 



2 (1). Dorsum and pleurae shining black. (2284. alpina, Lw.) 



Family XXXVIIL— SCIOMYZID^E. 



TABLE OE GENERA. 



1 (12). Antennae not very long, or if long then drooping, 



never horizontal ; the second joint always shorter 

 than the third ; upper edge of third not generally 

 concave. 



2 (7). Facial profile perpendicular and concave, hollowed 



out beneath the antennae, and then produced at 

 the upper mouth edge ; wings very long and broad, 

 much longer than the abdomen. 



3 (4). V.4. bent towards V.3. 



517. Lucina, Mg. (2289. fasciata, Mg.) 



4 (3). V.4. almost straight. 



5 (6). Jowls broader than the perpendicular breadth of the 



eye; costa slightly spined. Actora, Mg. (518) 



6 (5). Jowls narrower than the perpendicular breadth of the 



eye ; costa not spined. Dryomyza, Fin. (520) 



7 (2). Facial profile somewhat retreating, and only slightly 



concave ; wings moderately long, and only a little 

 longer than the abdomen. 



8 (9). X.5 2 springing almost at a right angle from V.5. ; 



hind tibiae bare, except for the praeapical bristle. 



Sciomyza, Fin. (533) 



9 (8). X.5 2 forming a sharply acute angle at the lower outer 



corner of 0.5 2 ; hind tibiae bristly outside. 



