DURHAM DIPTERA. 349 



XLIX. 



22 (21). Face concave on the upper part ; arista short 



combed. 603. Atissa, Hal. (2614. pygmcza, Hal.) 



23 (18) (28). Eyes with scattered hairs or almost bare. 



24 (27). Costa reaching to the end of V.4. 



25 (26). Face hairy at the sides ; three pairs of dorso-central 



bristles. Philhygria, Stnh. (604) 



26 (25). Face not hairy at the sides ; only one pair of dorso- 



central (praescutellar) bristles ; wings with two clear 

 dots near X.5. Hyadina, Hal. (605) 



27 (24). Costa only reaching to the end of V.3. 



606. Axysta, Hal. (2624. cesta, Hal.) 



28 (18) (23). Eyes bare. 



29 (30). Fore femora very much thickened. 



608. Ochthera, Ltr. (2627. mantis, Deg.) 



30 (29). Fore femora not thickened. Pelina, Hal. (607) 



31 (17). Eyes bare ; mouth opening large ; face very strongly 



arched (VII. 21). 



Sub-Family Ephydriinle, Lw. 



32 (33). V.I .a. partly, and at least always at the end separated 



from VI, b. 

 633. Aulacigaster, Mcq. (2677. rufitarsis, Mcq.) 



\Drosophilid(B^\ 



33 (32). V.I. a. nowhere separated from V.l.b. 



34 (41). Upper lip (labrum) protruding (VII. 26). 



35 (38). The opening of the mouth comparatively small. 



36 (37). Fore femora very much thickened. 



608. Ochthera, Ltr. (2627. mantis, Deg.) 



37 (36). Fore femora not thickened. Pelina, Hal. (607) 



38 (35). The opening of the mouth extremely large. 



39 (40). Face bare, with a single long bristle on each side ; 



only from two to three distinct dorso-central 

 bristles. Parhydra, Hal. (610) 



40 (39). Face with several long bristles on each side, the sides 



of the mouth also bristly ; five distinct dorso-central 

 bristles. 

 611. Halmopota, Hal. (2637. salinarum, Bouchd) 



