DURHAM DIPTERA. 277 



XXXIII. 472. 



18 (17) (19). Abdomen entirely grey. (2120. palliceps, Ztt.) 



19 (17) (18). Abdomen grey with a row of small black 



triangular spots. (2 118. beta, Curt.) 



20 (1). Abdomen red or yellow. 



21 (34). Squamae of moderate size, with the scales unequal; 



legs yellow, with black tarsi. 



22 (33). Thorax principally black or grey. 



23 (30). Scutellum black, or nearly black. 



24 (25). Palpi black ; abdomen oblong and thick. 



2022. Pegomyia rufipes, Fin. 

 Bishop Auckland, 2 $ and 2 $, April-May, 1902. 



25 (24). Palpi yellow ; abdomen linear, and marked with 



black transverse lines. 



26 (27). Abdomen cylindrical in the male, last three joints of 



mid and hind tarsi dilated in the female. 



(2025. latitarsis, Ztt.) 



27 (26). Abdomen narrow, depressed ; female tarsi not dilated. 



28 (29). Wings with the outer X-veins straight. 



2023. Pegomyia transversa, Fin. 

 South Durham, 1 5 . 



29 (28). Wings with the outer X-veins sinuous, (winthemi, Mg.) 

 80 (23). Scutellum red or yellow. 



31 (32). Palpi yellow with black tips. (2028. fidgens, Mg.) 



32 (31). Palpi quite yellow. (2030. ephippium, Ztt.) 



33 (22). Thorax pale. ( 2 °34- silacea, Mg.) 



34 (21). Squamae small with equal sized scales. 



35 (48). Thorax more or less black or grey. 



36 (42) (45). Palpi and scutellum black. 



37 (41). Antennae with all the joints black. 



38 (39) (40). Eyes of the male touching ; base of fore femora 



black. (2024. transgressa, Ztt.) 



39 (38) (40). Eyes of the male slightly separated ; fore femora 



all yellow. ( 2I 3 I - versicolor, Mg.) 



40 (38) (39). Eyes remote in both sexes, (rotundicornis, Ztt.) 



41 (37). Antennae with the basal joints pale ; upperside of 



fore femora grey. (2129. exilis, Mg.) 



