DURHAM DIPTERA. l8l 



XXVIII. 279 



9 (13). Third antennal joint pale beneath. 



10 (11) (12). First fore tarsal joint very large; other joints 



small (VII. 7). 



1483. Platychirus peltatus, Mg. 

 Wearhead, 1 $, 19-7-97; Belburn, 2 ?, 3-7-97, 1 $, 



9-6-98; Escomb, 1 $, 24-4-98. 



11 (10) (12). First fore tarsal joint broad and long, second 



broad, but very short (VII. 8). 



1484. Platy chines scutatus, Mg. 

 Common everywhere. June till September. 



12 (10) (11). First fore tarsal joint broad and long, others 



gradually decreasing in length and breadth 

 (VII. 9-10); a long recurved hair under the tip of 

 the mid femora. 



1485. Platychirus albimanus, F. 

 Common everywhere. May till September. 



13 (9). Third antennal joint all black. 



14 (15). Fore tibiae abruptly dilated at the tip. Legs mostly 



black. (i486, fiodagratus, Ztt.) 



15 (14). Fore tibiae gradually dilated. Legs mostly yellow. 



16 (19). Fore femora with a row of isolated black hairs 



behind. 



17 (18). Fore femora with no long twisted white hair at the 



base behind. 



i486. Platychirus scambus, Stseg. 

 Bedburn, 1 $, 7-7-02. 



18 (17). Fore femora with a long white hair at the base 



behind. (1488. immarginatus, Ztt.) 



19 (16). Fore femora without any row of isolated long black 



hairs behind. 



20 (23). Femora all orange. 



21 (22). Fore femora with very dense blackish pubescence 



behind. (1489. fulviventris, Mcq.) 



22 (21). Fore femora with moderate pale pubescence behind. 



(1490. fierpallidus, Verr.) 



