316 DURHAM DIPTERA. 



XXXVIII. 



10 (11). Vertex dull ; wings brownish, darker along the outer 



fore margin. 

 524. Ph^eomyia, Schin. (2320. fuscifiennis, Mg.) 



11 (10). Vertex shining ; wings blackish. 



525. Pelidnoptera, Rnd. (2321. nigripennis, F.) 



12 (1). Antennae very long and horizontal, the second joint 



often as long as, or longer than the third, the 

 upper edge of the third concave (III. 54). 



13 (14). Hind femora very much thickened, and extending far 



beyond the end of the abdomen ; second joint of 

 antennae more than twice as long as the third, and 

 stylelike. Sepedon, Ltr. (529) 



14 (13). Hind femora not extraordinarily thick, and scarcely 



extending beyond the abdomen; second joint of 

 antennae as long as the third, or, if longer, then 

 always broad, and never stylelike. 



15 (16). Arista long-plumed, the hairs spreading and generally 



dark ; the third antennal joint never bristly at the 

 end. Tetanocera, Dum. (526) 



16 (15). Arista bare, or, if short-plumed, the hairs lie flat and 



are mostly white ; third antennal joint often bristly 

 at the end. 



17 (18). Wings freckled with brown or blackish markings ; 



X.5 2 straight, or only slightly bent. 



Limnia, Dsv. (527) 



18 (17). Wings not freckled, at most a few brown dots ; X.5 2 



waved, twice bent. Elgiva, Mg. (528) 



TABLE OP SPECIES. 



518. Actora, Mg. 



2290. Actora cestuum, Mg. 

 Hesleden Shore, 1 $, July, 1904. 



520. Dryomyza, Fin. 



1 (2). Wings quite clear, 8-1 1 mm. 



2292. Dryomyza flaveola, F. 



Bishop Auckland, Shull, Harperley, 6 $ and 2 $, 

 June-September, 1900-01. 



