1909.] 113 



ON THE BRITISH SPECIES OF PHORA 

 {Continued from page 63). 

 BY JOHN H. WOOD, M.B. 

 3fi (1) Costal fringe long. 



37 (84) Meso-pleurse bristly; or if bare, then hind tibise ciliated with distinct 



bristles. 



38 (71) Meso-pleurse bristly. 



39 (48) First joint of the front tarsi dilated, or the whole tarsus distinctly 



thickened. 

 The 5 species falling under this head have black halteres ; the pleural bristles 

 uniform in size (in conformis they are very tender and not infrequently quite 

 absent) ; the frons black, scarcely shining and moderately broad (about y 

 broader than long) ; the hind tibise plainly but not strongly ciliated, and the 

 front ones ciliated with small and fine black bristles in the males of all the 

 species but hortensis. 



40 (43) The first joint only dilated, the other joints slender in both sexes. 



41 (42) Wings dusky. A large species. 



(? 9 . Thorax and abdomen black ; upper pair of supra-antennal bristles large, 

 under pair not half the size, antennae moderately large, J palpi black, large 

 and broad with short bristles, $ palpi yellower, smaller, and with ordinary 

 bristles; costa about to middle of wing, fringe of moderate length, 1 froni two 

 to three times as long as 2, angle at fork acute, 1st thin vein comes off at the 

 fork with a very gentle curve and then runs straight to the margin ; legs 

 yellowish-brown, paler in female, the dilated first joint of the tarsi not as wide 

 as the tibise ; hypopygium of moderate size, usually more or less retracted 

 within the 6th segment, but exposing when protruded a yellow ventral plate and 

 a small tuft of hairs at the right lower corner, the dusky anal organ rather 

 short and stout 2 mm. obscuripennis, n. sp. 



42 (41) Wings clear or nearly so. A small, almost minute species. 



S ? . Thorax and abdomen black ; supra-antennal bristles small, especially the 

 under ones, <J antennse large, palpi black, rarely if ever yellow, and of the 

 usual form and armature ; costa not quite to middle of wing, fringe full long, 

 1 from half as long again to twice as long as 2, angle at fork moderate, Ist thin 

 vein leaves at the fork and runs with a gentle curve to the margin ; legs black 

 or blackish -brown, first joint of the front tarsi at least as wide as the tibia in 

 male, but rather less in female, black and strongly contrasting with the yellow of 

 the other tarsal joints ; hypopygium large and grey, with 2 or 3 bristles (one of 

 which is much stouter than the others) at the lower corners, ventral plate 

 inconspicuous, the dusky anal organ long and slender... 



about J mm. conformis, n. sp. 



43 (40) The whole tarsus distinctly thickened in the male, but in the female the 



thickening limited to the first joint. 



44 (47) Legs dark broton or blackish-brown. 



46 (46) Hind femora thickly fringed in the male with short stubby hairs. 



K 



