DURHAM DIPTERA. 23 1 



XXXI. 392. 



392. DigonoceletA; Rnd. 



1 (2). Palpi orange. (1812. spinipennis, Mg.) 



2 (1). Palpi black. 



181 3. Digonochceta setipennis, Fin. 

 Bishop Auckland, 3 $ and 1 $, May-July, 1899-1902. 



393. Thryptocera, Mcq. 



1 (4). Wings with generally V.I., V.3., and V.5. bearing 



bristles, at least with more than V.3. bristly. 



2 (3). Third antennal joint moderately broad. 



(1814. piHpenm's, Mg.) 



3 (2). Third antennal joint unusually broad and plump. 



18 1 5. Thryptocera crassieorm's, Mg. 



Bishop Auckland, 1 ?, Wearhead, 1 $, July-August, 

 1900-1901. 



4 (1). Wings with not more than V.3. bristly. 



5 (8). Legs yellow. 



6 (7). Abdomen orange with black central stripe. 



(1816. bicolor, Mg.) 



7 (6). Abdomen grey with white incisions. 



(18 1 8. latifrons, Mg.) 



8 (5). Legs black or dark brown, at most the tibiae orange. 



9 (10). Very small species, 2 mm. ; V.4. beyond the bend, 



almost obsolete. (-tSiy. minutissima, Ztt.) 



10 (9). Larger species, 4-5 mm. ; arista apparently two- 

 jointed ; V.4. complete. 

 388. Discoch^ta, Br. & Berg. (1806. muscaria, Fin.) 



393^. Craspedothrix, Br. & Berg. 



i8i8-|-. Craspedothrix vivipara. 

 Bishop Auckland, 1 $, 20-7-00. 



396. Siphona, Mg. 



1 (2). First abdominal segment without bristles. 

 1 82 1. Siphona crhtata, F. 

 Belburn Wood, 2 $ and 1 ?, Bishop Auckland, 1 $, 

 Evenwood, 1 ?, May-July, 1897-1900. 



