322 DUEHAM DIPTERA. 



XXXIX. 530. 



4 (3). Small species, not more than 6 mm. 



5 (6). Orange species, 5-6 mm. 



2345. Psila rufa, Mg. 

 Hesleden, 1 $ and 1 ?, June, 1900. 



6 (5). Smaller pale yellow species, 4 mm. 



2346. Psila pallida, Fin. 



Hesleden, 1 $, June, 1900. 



The specific characters given are very unsatisfactory, 

 and I may be mistaken in my identifications of the 

 two last species, but they seem to be different. 



7 (2). Abdomen black. 



8 (9). Antennae yellow with the third joint black or dark 



brown. ( 2 353- bicolor, Mg.) 



9 (8). Antennas all yellow. ( 2 347« debilis, Egg.) 



10 (1). Dorsum and abdomen shining black ; humeri and 



pleura? sometimes orange. 



11 (12). Pleurae orange, sometimes also the humeri and sides 



of dorsum. (2348. pectoralis, Mg.) 



12 (11). Pleurae black. 



13 (16). Legs with at least the femora black. 



14 (15). Tibiae and tarsi yellow, with broad brown ends. 



(2351. atra, Mg.) 



15 (14). Tibiae and tarsi all pale. ( 2 35 2 « nigra, Fin.) 



16 (13). Legs with the femora yellow. 



17 (18). Frons all or nearly all black, sometimes narrowly yellow 



on the eye-margins and above the antennae. 



{gracilis, Mg.) 



18 (17). Frons all or nearly all yellow, only the ocellar triangle 



or the vertex dark brown. 



19 (20). Third antennal joint all yellow, or at most the upper 



edge or the tip black. ( 2 349« rosce, F.) 



20 (19). Third antennal joint all black. 



21 (22). Large species, 4 mm. 



2350. Psila nigricornis, Mg. 

 Bishop Auckland, 2 $, May; 1 $ (greenhouse), 

 February, 1900. 



