DURHAM DIPTERA. 38 1 



LVI. 658. 



17 (18). V.3. much bent up to the fore margin and ending 



long before the tip of the wing; shining black 

 species with eight scutellar bristles. 

 2805. Limosina fontinalis, Fin. 

 Bishop Auckland, i $ and 4 ?, Jan.-March. 



18 (17). V.3. straight, or very slightly bent up, and ending 



near the wing tip. 



19 (20) (22a). Wings clear, or nearly so ; dark brown species ; 



scutellar bristles usually eight. 

 2807. Li?nosina lutosa, Stnh. 

 Gibside, 2 $, 1 ?, April, 1898; Harperley, 1 $, April. 



20 (19) (22a). Wings brownish ; black species, with usually 



only six scutellar bristles. 



21 (22). Legs all black. (2809. limosa, Fin.) 



22 (21). Fore coxae, knees, and tarsi reddish. 



(2810. geniculata, Mcq.) 



22a (20) (19). Wings whitish; antennae lying close to the 



eyes. (2834- leiicoptera, Hal.) 



23 (16). C 2 about equal to C 3 . 



24 (35). Antennae standing out clear of the face, " obliquely 



porrect." 



25 (26). Fore tarsi dilated, especially in the male. 



(2823. crassimana, Hal.) 



26 (25). Fore tarsi not dilated. 



27 (32). Wings blackish or greyish. 



28 (29). Shining black species ; frons opaque, triangle shining; 



a black line on C 2 . (2825. ficngicola, Hal.) 



29 (28). Dull black species. 



30(31). Halteres brown; wings brownish; scutellum long; 



legs unusually pubescent. (2824. quisquilia, Hal.) 

 31 (30). Halteres black ; wings blackish ; costa thickened 



about the middle, with a long erect basal spine; 



arista with thick black pubescence. 



(2828. sfiinifiennis, Hal.) 

 82 (27). Wings clear or white. 



