DURHAM DIPTERA. 171 



XXVIII. 



80 (85). Hind femora without spines or tooth-like process 



beneath. 



81 (84). Facial profile pointed like a Roman nose. 



82 (83). Eyes separate in the male. Criorrhina, Mg. (307) 



83 (82). Eyes touching in the male. 



309. Cynorrhina, Willist. (1598. fallax, L.) 



84 (81). Facial profile blunt, snub-nosed. 



308. Pocota, St. Farg. (1597. afiiformis, Schrk.) 



85 (80). Hind femora spinose beneath. 



310. Brachypalpus, Mcq. (1599. bimaculatus, Mcq.) 



86 (79). Species not very hairy. 



87 (94). Hind femora thick and spinose, or with tooth-like 



process beneath. 



88 (89). X.4 2 doubly bent, like two sides of a hexagon, with 



usually a hang-vein from its outer point (V. 19^), 

 the outermost tip of 0.4 2 being at the bend of X.4 2 . 

 Profile (VI. 12). Eumerus, Mg. (313) 



89 (88). X.4 2 normal (V. 19), outermost tip of 0.4 2 being 



where X.4 2 joins V.3. 



90 (91). V.3 2 somewhat looped. 



305. Tropidia, Mg. (1590. scita, Harr.) 



91 (90). V.3 2 straight, or only gently and regularly bent. 



92 (93). Small species, with X.4 1 at right angles to V.4. (V. 19), 



and with the hind femora extraordinarily thick. 

 Profile (VI. 13). Syritta, St. Farg. (312) 



93 (92). Larger species, with the lower fore corner of 0.4 1 an 



acute angle, X.4. as in (V. 19^). Hind femora 

 thick and long. Xylota, Mg. (311) 



94 (87). Hind femora neither thick nor spinose. 



95 (96). Thorax and scutellum margined with strong black 



bristly hairs. Chrysochlamys, Rnd. (314) 



96 (95). Thorax without any strong bristles. 



315- Calliprobola, Rnd. (1613. speciosa, Rossi.) 



97 (1). Antennae long, extended horizontally, and proceeding 



from a produced or prominent frons. 



98 (105). V.3 2 without any loop or veinlet on its underside. 



