DURHAM DIPTERA. 221 



XXXI. 338. 



26 (11). Legs entirely black, or at most the tibiae dark 



brown. 



27 (28). Lower fronto-orbital bristles invading the cheeks 



in a double row, or irregularly. 



Aporomyia dubia (1735, page 219) 



28 (27). Lower fronto-orbital bristles invading the cheeks in a 



single regular row. 



29 (32). Lower facial bristles reaching the middle of the 



facialia. 



30 (31). Discal abdominal bristles absent from the middle 



segments. 

 341. Myxexorista, Br. & Berg. (1689. fauna, Mg.) 



31 (30). Discal abdominal bristles present on the middle 



segments. 



341. Myxexorista (1691. libatrix, Mg.) 



32 (29). Lower facial bristles not nearly reaching the middle 



of the facialia. 



33 (42). Scutellum wholly red, or at least at the sides broadly 



red brown. 



34 (37). Abdomen red at the apex. 



35 (36). Wings with the X-veins clouded. 



(1682. ruficauda, Ztt.) 



36 (35). Wings with the X-veins clear. 



348. Celetolyga, Rnd. (17 13. apicalis, Mg.) 



37 (34). Abdomen black or grey at the apex. 



38 (39). Palpi with only the tips red. 



347- Sisyropa (1709. lota, Mg.) 



39 (38). Palpi wholly orange. 



40 (41). V.4. beyond the angle, curved. (1675. affinis, Mg.) 



41 (40). V.4. beyond the angle, straight. 



(1683. noctuicida, Rnd.) 



42 (33). Scutellum wholly black or grey, at most with the tip 



a little reddish. 



43 (44). Discal abdominal bristles present on the middle 



segments. (1684. jucunda, Mg.) 



44 (43). Discal abdominal bristles absent from the middle 



segments, 



