1909.] ^^^ 



101 (100) nind tl/jire simple. 



102 (103) Four large and nearly equal supra-antennal bristles. 



$ ? . Thorax variable, usually black, sometimes tinged with red or quite reddish- 

 yellow, abdomen black ; frons black, about half as broad again as long (<?), 

 rather less (? ) ; wings tinged with yellowish-brown, especially in female, costa 

 quite to middle of wing, fringe long, but not as long as in rufipes, 1 somewhat 

 longer than 2, but never longer than 2 + 3, angle at fork larger than in rufipes, 

 and variable sexually, 1st thin vein strongly curved at its origin, particularly 

 in the female ; legs yellow, tinged to a greater or less extent with brown, no 

 long hairs underneath the hind femora ; male abdomen not slender, as in 

 rufipes, hypopygium the same as in angusta U-2 mm. pulicaria, Fal. 



103 (102) Supra-antennal bristles small ; under pair minute. 



104 (105) Male hi/popygium short, loith the anal organ stout and filling its pos- 



terior outlet. Female costa sivollen. 

 S ? . Very like tumida, but a much smaller and yellower species :-Further, the 

 costa is more distinctly thickened, though less conspicuously than in denotata; 

 the legs and halteres are yellow, the wings deeply yellowish, and the palpi 

 clear yellow ; the supra-antennal bristles smaller, especially the under pair, 

 while the hypopygium is quite different, being of a common type, such as is 



represented in angusta ; in all else like tumida... 



l_li mm. subtumida, n. sp. 



105 (104) 3Iale hypopygium very long (as long or longer than the 6ih segment) and 



cylindrical ; anal organ minute. Female costa not stvollen. 

 S 9 . Thorax and abdomen black ; frons black, about twice as broad as long, but 

 somewhat less ( ? ), under pair of supra-antennal bristles very small, antennae 

 of ordinary size, palpi yellow; wings tinged with yellowish-brown, costa 

 beyond middle of wing, 1 not much longer than 2, and not longer than 2 + 3, 

 angle at fork large in both sexes, and nearly a right angle (^), curve at which 

 1st thin vein leaves small, especially (<? ) ; legs (c?) yellow, with margins of 

 femora blackened, hind femora extensively darkened towards tip, hind tibia 

 thickened in their lower half and fringed along the upper border with 

 numerous small erect hairs, legs ( ? ) browner, and hind tibiae neither thickened 

 nor fringed; halteres ( c? ) yellow (in one specimen somewhat dusky), halteres 

 ( ? ) more or less dusky (in one specimen nearly black) ; male abdomen long 

 and slender, as in rujipes, the ordinary hairs on the last two or three segments 

 better developed than usual, hypopygium very large, exceeding in all its 

 dimensions the 6th segment, and similar in type to those of denotata and 

 discreta, three smallish bristles are placed at each lower corner in horizontal 

 line and at equal intervals apart, and above them a group of small erect hairs, 

 ventral plate small, and ending apparently in a triangular point... 



li — 1| mm. nudiventris, n. sp. 



Tarrington, Hereford : 

 July, 1909. 



-- — " T 2 



