DURHAM DIPTERA. 33 



106 (107). Hind metatarsus thickened, and shorter than the 



next joint. BoRBORiDiE (LVI.) 



107 (106). Hind metatarsus longer than the next joint, and 



not thicker than it. 



108 (115). X.5 1 absent, X.5 2 present, that is only one X-vein 



on V.5., and that placed beyond X.4. (V. 36). 



109 (HO). Legs long and thin, abdomen very long. 



Micropeza, Mg. (535) 



110 (109). Legs short and strong, abdomen oval or elliptical. 



111 (112). Lower fronto-orbital bristles absent. Third joint 



of the antennas round, or if lengthened then the 

 head in profile is triangular. Chloropid^ (LI.) 



112 (111). Lower fronto-orbital bristles present. Third joint 



of the antennae generally long or oval, the head 

 in profile never triangular. 



113 (114). Head square, face strongly convex (VII. 21). 



O.6 1 absent, not orange coloured species. 



Ephydrid^; (XLIX.) 



114 (113). Head round or semicircular, face not arched 



(VII. 19). O.6 1 present, or if absent then the 

 species orange coloured. Drosophilid.33 (L.) 



115 (108). X.5 1 present, or if absent then X.5 2 also absent, 



that is, two X-veins or no X-vein on V.5. 



(V. 33, 33)- 



116 (117). Scutellum in the male extraordinarily long and 



squared off behind. Costa thickened from the 

 end of V.I. to the wing tip. 



501. Thyrephora, Mg. (2245. furcata, F.) 



117 (116). Scutellum usually short, and somewhat triangular. 



Costa normal. 



118 (183). Mouth bristles present. 



119 (122). Fronto-orbital bristles absent. 



120 (121). Wings without a black spot near the tip. 



PlOPHILIDiE (XLVII.) 



121 (120). Wings with a black spot near the tip. 



Sepsid^e, part (XLVI.) 



122 (119). Fronto-orbital bristles present. 



c 



