1909.] 27 



palpi yellow ; wings grey, costa and veins blackish, costa rather short, 1 longer 

 than 2, and equal to 2 + 3 ; hind femora clouded with gi*ey at the apex, tibial 

 cilia small but distinct ; hypopy^ium large, sub-anal body when exposed (rarely) 

 very large, ventral process minute, scarcely visible, anal organ stout and yellow, 



not depressed ^ — f mm. surdifrorm, n. sp. 



21 (17) Frons hiqhli/ gloss t/, or at least distinctly shining. 



23 (24) Wings hyaline, or at any rate colourless ; thin veins faint. 



S ^ . Thorax and abdomen deep black, the former shining ; frons rather wider 

 than long, very glossy, one pair only of supra-antennal bristles, palpi dusky 

 yellow; costa black and strong, incrassated at the humeral cross vein, reaching 

 well to the middle of the wing, 1 rather larger than 2, and shorter than 2 + 3 ; 

 legs black, tibial cilia distinct ; hypopygium large, ventral process inconspicuous, 

 the yellowish anal organ long and depressed, reaching below the level of the 

 hypopygium, provided tlie inner parts are not protruding... 



2 mm. parva, n. .^p. 



24 (23) Wings tinged toith hrotvn, usually deeply ; thin veins distinct and suffused. 



25 (26) First costal division very much longer than the second, nearly thrice as long . 

 (J 9 . A remarkably black insect, all the parts, even down to the palpi and fore legs 



(including the coxae), being deejj black ; frons moderately shining, not much 

 broader than long, the supi'a-antennal bristles rather small and of nearly equal 

 size ; costa less than half the wing length (,?) about half ( 5^ ), 1 nearly three 

 times 2, and 2 scarcely longer than 3 ; hind femora not dilated, the fringe of 

 hairs on the lower border unusally short, hind tibise thickened, and the cilia 

 very minute and numerous, hind metatarsus stouter than ordinary ; S abdomen 

 stout, hypopygium very small, anal organ minute... 



nearly 2 mm. mallochi, n. sp. 



26 (25) First costal division not greatly longer than second, at most half as long 



again. 



27 (28) Costa reaching beyond middle of wing. A medium-sized species. 



S ? . Thorax and abdomen deep black, the former shining ; frons rather broader 

 than long, highly glossy, four strong and nearly equal supra-anlennal bristles, 

 palpi black ( <J ), yellowish (?) ; wings deeply tinged, especially along course of 

 thin veins, the disc often occupied by an indistinct darker cloud, fringe very 

 short, inner half of costa somewhat thickened and outer half slender ( <? ), slender 

 throughout ( ? ), 1 a trifle longer than 2, first thin vein (c?) provided with a 

 long stalk, and thus starts at some distance on the basal side of the fork ; legi 

 black, fore legs brown, and fore coxae yellow, tibial cilia weak ; hypopygium 

 small and very featureless, little more than a minute yellowish anal organ 

 visible li mm. glabrifrons, n. sp. 



28 (27) Costa distinctly short of middle of wing. A very small species. 



(J ? . Thorax and abdomen black, the former shining ; frons scarcely as broad as 

 long, glossy, four supra-antennal bristles, the under pair close together, low down, 

 and often concealed between the antennae, palpi yellow or dusky yellow ; veins 

 brown, costa dark brown and slender, 1 nearly half as long again as 2, and 

 rather longer than 2 + 3, inner branch of second thick vein enters costa at a 

 much larger angle than does first thick vein ; legs blackish-brown, tibial cilia 



C 2 



