l8o DURHAM DIPTERA. 



XXVIII. 278. 



46 (47). Middle joints of the fore and mid tarsi pale; a small 



narrow species. (*475- mutabilis, Fin.) 



47 (46). Basal joints of the fore and mid tarsi pale. 



48 (49). Eye hairs pale. Size 8 mm. Antennae blackish. 



proximo,, Ztt. (1477) 



49 (48). Eye-hairs short and mostly blackish. Size 5^- mm. 



Antennae often brown. vernalis, Fin. (1476) 



50 (41). Tibiae and tarsi mostly yellow. 



51 (52). Small narrow species. Size 7 mm. 



(1474. precox, Ztt.) 



52 (51). Size 8-10 mm. 



53 (54). Thorax with depressed hairs ; hind tibiae not banded. 



/rate ma, Mg. (1472) 



54 (53). Thorax with nearly erect hairs. 



(1473. bergenstammi, Beck.) 



279. Platychirus, St. Farg. 



Life history unknown. No. 1484 is said to have been bred 

 from rotten fungi. 



Males. 



1 (8) (26). Fore tarsi only dilated ; fore tibiae normal (VII. 6). 



2 (7). Fore tarsi with only the first and second joints 



dilated (VII. 6), and pale. 



3 (6). Abdominal spots orange. Size 8-8^ mm. 



4 (5). Dull species ; mouth much produced beyond the 



facial knob. 



1479. Platychirus manicatus, Mg. 

 Common everywhere. May till August. 



5 (4). Shining species ; mouth not much produced. 



(1480. tarsalis, Schum.) 



6 (3). Abdominal spots hoary bronze. Size 7 mm. 



(148 1. disa'manus, Lw.) 



7 (2). Fore tarsi with the first, second, and third joints 



dilated and pale. (1482. melanopsis, Lw.) 



8 (1) (26). Fore tibiae and fore tarsi dilated (VII. 7-10), 



sometimes only slightly. 





