DURHAM DIPTERA. 215 



XXXI. 



90 (89). Face perpendicular, or very slightly retreating ; arista 



tapering. 



91 (92). Third antennal joint generally four times, and always 



more than three times the length of the second. 



395. Hypostena, Mg. (1820. procera, Mg.j 



92 (91). Third antennal joint at most three times the length 



of the second, but generally shorter. 



93 (94). Fore tarsi more than twice as long as the tibiae ; legs 



much lengthened. Myobia, Dsv. (371) 



94 (93). Fore tarsi as long as, or only slightly longer than the 



tibia? ; legs moderately long. 



95 (96). Wings as long as, or only slightly longer than the 



almost spherical abdomen. Clytia, Dsv. (402) 



96 (95). Wings considerably longer than the conical or 



elliptical abdomen. 

 405. Redtenbacheria, Schin. (1837. insignis, Egg.) 



97 (76). Eyes hairy. 



98 (101). Facial bristles not reaching beyond the middle of 



the facialia. 



99 (100). Third antennal joint as long as, or only a little longer 



than the second ; arista pubescent, and apparently 

 two-jointed. Macquartia, Dsv. (363) 



100 (99). Third antennal joint at least twice as long as the 



second ; arista quite bare, distinctly three-jointed. 



Somolia, Rnd. (358) 



101 (98). Facial bristles present on the whole length of the 



facialia. Phorocera, Dsv. (344) 



102 (75). 0.4 2 closed, and mostly long-stalked. 

 103(104). Eyes hairy. 



365. Loewia, Egg. (175 1. setibarba, Egg.) 



104 (103). Eyes bare. 



105 (108). 0.4 2 short-stalked. 



106 (107). Upper mouth edge bare. 



404. Fortisia, Rnd. (1836. fceda, Mg.) 



107 (106). Face with very long bristles. 



412. Clista, Mg. (1853. lepida, Mg.) 



108 (105). 0.4 2 long-stalked. 



