42 DURHAM DIPTERA. 



III. 54. 



54. Sciophila, Mg. 



309. Sciophila omata, Mg. 



Shull, 1 ? , September, 1900. 



58. Macrocera, Pz. 



334. Macrocera fasciata, Mg. 



Gibside, 1 $. Bishop Auckland, 1 $, July, 1900. 



341. Macrocera stigma. 



Harperley, 1 $, June, 1903. 



59. Bolitophila, Mg. 



344. Bolitophila fuse a, Mg. 



Stanhope, 1 2 , May, 1900. 



346. Bolitophila cinerea, Mg. 



Bishop Auckland, 1 $, 1 $ , May, 1900. Harperley, 

 1 $, June, 1900. 



Family IV.— BIBIONID^E. 



The members of this family, many of which are of a good 

 size, are mostly black, or black and yellow. No one can fail 

 to find several species along the banks of our streams or in 

 damp woods from May till September. Larva? phytophagous, 

 on living plants, rotting vegetable matter, dung, &c. 



TABLE OP GENERA. 



1 (2). 0.5. open, X.5. absent Scatopse, Geoff. (65) 



2 (1). X.5. present, closing 0.5 1 (IV. 7). 



3 (4). Fore tibiae ending in a crown of thorns (VI. 2). 



Dilophus, Mg. (67) 



4 (3). Fore tibiae ending in a strong beak-like process 



(VI. 3). Bibio, Geoff. (68) 



TABLES OF SPECIES. 



65. Scatopse, Geoff. 

 The larvae live on vegetable matter and in dung. 



1 (4). Base of V.4,a. widely awanting. 



2 (3). 0.1. very broad, V.3. bent upwards. 



(366. inermis, Ruthe\) 



