212 DURHAM DIPTERA. 



XXXI. 



41 (36). Abdomen conical ; the longest facial bristles nearly 



on the middle of the facialia. 



Meigenia, Dsv. (332) 



42 (17). Eyes hairy. 



43 (44). 0.4 2 closed. Olivieria, Dsv. (374) 



44 (43). 0.4 2 open. 



45 (62). Third antennal joint as long as, or at most twice as 



long as the second. 



46 (47). Shining gold green species. 



Gymnoch^eta, Dsv. (337) 



47 (46). Species otherwise coloured. 



48 (49). V.4. with a hang- vein at the bend ; palpi small, 



almost rudimentary. Micropalpus, Mcq. (378) 



49 (48). V.4. without a hang-vein; palpi distinctly present. 

 50(59). Abdomen broadly oval; the portion of V.4. beyond 



the angle usually curved ; the costal spine absent. 



51 (54). Lower facial bristles reaching to about the middle of 



the facialia. 



52 (53). The largest facial bristles situated about the middle 



of the facialia. Meigenia (332) 



53 (52). The largest facial bristles situated close to the 



mouth. Exorista (338) 



54 (51). Lower facial bristles absent, or at most only a few 



close to the mouth. 



55 (58). Discal abdominal bristles absent from the middle 



segments. 



56 (57). Cheeks with short but distinct hairs near and below 



the invading fronto-orbital bristles ; jowls deep. 



334. Meriania, Dsv. (1600. puparum, F.) 



57 (56). Cheeks bare ; jowls not deep. 



Ch/ETo-lyga, Rnd. (348) 



58 (55). Discal abdominal bristles present on the middle 



segments ; jowls deep, nearly as deep as the long 

 diameter of the eye. Varich^ta, Speis (379) 



59 (50). Abdomen cylindrical ; the portion of V.4. beyond the 



angle always quite straight; the costal spine 

 present. 



