DURHAM DIPTERA. 157 



XXIV. 247. 



4 (3). Tip of the fore tarsi dilated, but without lappets; 



face black ; mid femora and tibiae with a row of 

 bristles and finely haired. (1344- pusillns, Mg.) 



5 (2). Fore tarsi simple ; mid tibiae twisted and thickened 



at the end. 



6 (7). Third antennal joint long, thin, and pointed, but not 



sharply so; hind femora with a row of bristles 

 beneath ; fore femora bare beneath. 

 1 34 1. Campsicnemus curvipes, Fin. 

 Hesleden, i $ , August, 1900. 



7 (6). Third antennal joint moderately long, the end dis- 



tinctly blunt ; fore and mid femora with a row of 

 bristles beneath. ( I 34°- sc ambus, Fin.) 



8 (1). Fore and mid legs not dilated. 



9 (14). Antennae black, not yellow at the base. 



10 (11). Mid metatarsus shorter than the next joint ; mid 



femora of the male with an interrupted row of 

 bristles beneath, 10-n on the basal half, 4-6 

 before the tip. (1342. loripes, Hal.) 



11 (10). Mid metatarsus much longer than next joint. 



12 (13). Mid femora and tibiae of the male with a continuous 



row of long bristles beneath. (1343. armatus, Ztt.) 



13 (12). Mid femora and tibiae with only very small bristles. 



(1345. pectinulatus, Lw.) 



14 (9). Antennae yellow at base ; legs quite simple. 



(1346. picticornis, Ztt.) 



250. Sympycnus, Lw. 



1 (2). Legs black. ( I 35 2 » cirrhipes, Wlk.) 



2 (1). Legs mostly yellow. 



8 (4). Fore coxae black, only the extreme point yellow ; fore 

 femora with a dark ring ; third antennal joint 

 sharply pointed. ( I 353- annulipes, Mg.) 



4 (3). Fore coxae yellow, only the extreme base dark. 



5 (6). Third joint of the hind tarsi with a depressed thorn-like 



bristle beneath at the tip ; hind femora with a brown 

 streak on upper side. (1353-2, spiculatus, Gerst.) 



