DURHAM DIPTERA. 33 1 



XLII. 557. 



8 (1). Third antennal joint with a sharp upper corner in 



front ; V.3. indistinctly bristled or bare ; hind 

 femora bristled at the tip beneath. 



9 (10). The band on X.5. reaching the fore margin. 



(2412. altemata, Fin.) 



10 (9). The X.5 2 band only reaching V.3. (2413. meigenii i 'Lw .) 



560. Trypeta, Mg. 



1 (12). Wings distinctly banded. 



2 (3). Dorsum with three pairs of dorso-central bristles. 



(2416. jacece, Dsv.) 



3 (2). Dorsum with only two pairs of dorso-central bristles. 



4 (7). Scutellum with black spots or dots. 



5 (6). Dorsum with three pairs of round black spots. 



(2417. falcata, Scop.) 



6 (5). Dorsum with only one, or at most two pairs of black 



spots. 



2418. Trypeta onotrophes, Lw. 

 Hesleden, 3 $ and 1 ?, August, 1900. 



7 (4). Scutellum unmarked, or at most with the base 



blackish. 



8 (9). Second antennal joint with a short tooth-like process 



in the female, and a long claw-like process in the 

 male. (2419. cornuta, F.) 



9 (8). Second antennal joint simple. 



10 (11). The wing bands of varying intensity, and with light 



and dark parts. (2420. ttissilaginis, F.) 



11 (10). Wing bands uniformly pale. (2421. lafifttz, Cedj.) 



12 (1). Wings quite unspotted, or spotted but not distinctly 



banded. 



13 (16). Wings generally spotted. 



14 (15). Femora not thickened; abdomen chiefly pale haired. 



(2422. florescentice, L.) 



15 (14). Femora much thickened ; abdomen chiefly black 



haired ; wings sometimes unspotted. 



(2423. colon, Mg.) 



16(13). Wings unspotted; femora not thickened; abdomen 



chiefly pale haired. (2424. serrattila;, L.) 



