DURHAM DIPTERA. 2l3 



XXXI. 



60 (61). Abdomen wholly black ; 0.4 s always open. 



373. Zophomyia, Mcq. (1772. temula, Scop.) 



61 (60). Abdomen black and red ; 0.4 2 closed. 



Olivieria, Dsv. (374) 



62 (45). Third antennal joint always more than twice as long 



as the second. 



63 (64). Third antennal joint bow-shaped, i.e., strongly convex 



in front, concave behind. 



339. Epicampocera, Mcq. (1686. succincta, Mg.) 



64 (63). Third antennal joint straight in front, not bow- 



shaped. Exorista (338) 



65 (16). Facial bristles often very large, and present on the 



whole length of the facialia. 

 m (71). Eyes bare. 



67 (68). 0.4 2 closed. Baumhaueria (349|) 



68 (67). 0.4 2 open. 



69 (70). Frons only slightly prominent ; 0.4 2 ending rather 



near the point of the wing; abdomen elliptical, 



rather plump ; V.4. without a hang-vein. 



Frontina (342) 



70(69). Frons very prominent, conically protruding; 0.4 2 



ending long before the wing tip ; abdomen conical, 



slim ; V.4. with a hang-vein. Metopia, Mg. (424) 



71 (Q6). Eyes hairy ; 0.4 2 open. Phorocera, Dsv. (344) 



72 (15). 0.4 2 ending at the wing tip, or close before it, or 



both closed and long stalked; or, if 0.4 2 ends 

 rather before the wing tip, and so this character is 

 doubtful, then either X.5 2 is placed at, or nearly 

 at, the middle between X.4. and the bend of V.4.; 

 or the arista is distinctly pubescent; or V.3. is 

 bent downwards in front, so that O.3. is widened 

 out at its end, and throughout is, as a rule, rather 

 broad. 



73 (74). The bend of V.4. with a hang-vein ; abdomen without 



central bristles. 

 387. Ptychoneura, B. & B. (1805. rufitarsis, Mg.) 



74 (73). The bend of V,4. without a hang-vein. 



