220 DURHAM DIPTERA. 



XXXI. 338. 



7 (6). V.4. beyond the angle straight; 0.4 2 always quite 



open. 



8 (9). Arista thickened to its middle. (i6 , ]6.fimbriata,Mg.) 



9 (8). Arista long, slender, and only thickened at the base. 



(1680. mutabilis, Fin.) 



10 (1). Palpi orange, at least at the tip. 



11 (26). Legs wholly or partly red or yellow. 



12 (13). Legs wholly yellow. (1672. vetula, Mg.) 



13 (12). Femora black, tibiae yellow. 



14 (15). Lower fronto-orbital bristles invading the cheek in a 



double row, or irregularly. (1677. biserialis, Mcq.) 



15 (14). Lower fronto-orbital bristles invading the cheeks in a 



single regular row. 



16 (21). Yellowish grey species ; abdomen without, or with 



very faint reddish marks at the sides. 



17 (20). Scutellum all red. 



18 (19). Discal abdominal bristles absent from the middle 



segments. 



347. Sisyropa, Br. & Berg. (17 10. excisa, Fin.) 



19 (18). Discal abdominal bristles present on the middle 



segments. 

 356. Monoch^ta, Br.&Berg (1734. leucoplicea, Mg., 

 or with the scutellum only red at the tip, var. 

 albicans, Fin.) 



20 (17). Scutellum all black. (1681. perturbans, Ztt.) 



21 (16). Blackish grey species with distinct red marks at the 



sides of the abdomen. 



22 (25). Discal abdominal bristles absent from the middle 



segments. 



23 (24). Abdomen with orange side marks on only the first 



two segments ; frontal stripe as broad as the 

 frontal orbits, or broader. (1685. lucorum, Mg.) 



24 (23). Abdomen with orange side marks on the first three 



segments ; frontal stripe narrower than the orbits. 

 347. Sisyropa, Br. & Berg. (1708. lucorum, Rnd.) 



25 (22). Discal abdominal bristles present on the middle 



segments. (1673. chelonice, Rnd.) 



