76 DIPTERA. 



13 (12) . The antennal style not bisected, and with a microscopic bristle, 



but no pencil of hairs, at the tip. 



14 (15). Eyes of the male contiguous on the vertex; anal cell closed . Astrophanes, 0. S. 



15 (14). Eyes of the male not contiguous on the vertex ; anal cell open. 



16 (17). The contact of the discal cell with the third posterior not 



much longer than its contact with the fourth posterior cell ; 

 proboscis long, projecting far beyond the oral margin ; sides 

 of the abdomen with a fringe of scales, and not of hairs 

 only Lepidanthrax, O. S. 



17 (16). The contact of the discal cell with the third posterior at least 



twice as long as its contact with the fourth posterior cell ; 



the latter contact often merely punctiform Anthrax, Scopoli. 



18 (1) . The bifurcation of the second and third veins taking place some 



distance before the small cross-vein, at an acute angle ; the 

 second vein not forming a knee at its origin from the 

 prsefurca. 



19 (24) . Body Anthrax-like ; frontal triangle in the male large ; frontal 



space in the female of a corresponding size. 



20 (21). Antennas approximate at the base; third antennal joint gra- 



dually attenuate Oncodocera, Macq. 



21 (20) . Antennae remote at the base. 



22 (23). Pulvilli distinct Aphcebantus, Loew. 



23 (22). Pulvillinone Epacmus, O. S. 



24 (19). Body not Anthrax-like ; frontal triangle in the male small. 



25 (28). Body (antennae, thorax, abdomen) clothed with more scales 



than hairs, gibbose, the abdomen hanging down ; antennae 

 long, first joint unusually long. 



26 (27) . Four posterior cells Lepidophora, Westw. 



27(26). Three posterior cells Toxophora, Meig. 



28 (25) . Body clothed with hairs, or else nearly glabrous. 



29 (50). Four posterior cells. 



30 (39) . First posterior cell closed. 



31 (38). Two submarginal cells. 



32 (35) . First basal cell longer than the second. 



33 (34) . Head comparatively small ; the emargination of the occipital 



orbit almost imperceptible ; contact between the second sub- 

 marginal cell and the first posterior more than punctiform . Bombylius, Linn. 



34 (33) . Head comparatively large ; the emargination of the occipital 



orbit distinct ; contact between the second submarginal cell 



and the first posterior cell often only punctiform .... Comastes, O. S. 



35 (32). Both basal cells of equal length. 



36 (37). Underside of the head moderately pilose, and hence its different 



parts (including the base of the antennse, the oral edge, &c.) 



easily perceptible Systcechus, Loew. 



