351 TABANID^ 



of the postical vein is also clouded as well as its upper branch as far as the small 

 cross-vein and along that cross-vein and the short basal piece of the cubital 

 vein. Squamse dark glassy grey with blackish brown margins ; fringes short 

 except for a rather conspicuous Avhite tuft at the lowest part of the alar pair. 

 Halteres blackish brown. 



? . Resembling the male. Frontal stripe comparatively broad and short as it is 

 scarcely more than three times as long as its breadth at the lower eye-angle, 

 and it only very slightly diminishes in width from the vertex down to that 

 eye-angle ;_ the frons is grey and bears three black calli of which the lowest 

 one is shining black and is rather transverse all across just above the frontal 

 triangle, and may be joined by a thin black stripe to the long narrow oval 

 middle callus, which in turn may be rather vaguely connected with the dark 

 ocellar callus ; the frontal stripe bears obvious black pubescence on the upper 

 two-thirds, that on the vertical portion being rather longer than that on the 

 middle part, but on the lower third pale hairs are conspicuously intermingled 

 with the black hairs ; frontal triangle quite bare and shining black, but grey 

 just above the antennse, and divided by a furrow from the lowest frontal 

 callus ; ocellar space roundish and obvious, though but very slightly raised 

 above the level of the frons. Face with shorter and less bushy pubescence on 

 the side-cheeks, and with a few whitish grey hairs intermixed with the black 

 ones ; the whitish pubescence on the inner sides of the cheeks, about the 

 mouth, and at the back of the mouth, more conspicuous ; jowls under the 

 eyes at the back part and the back of the head right up to the vertex slightly 

 and equally puffed out, whitish grey, and bearing a rather short black ciliation 

 all along near the eyes, and behind this black ciliation (especially near the 

 upper part) is a long straggly light grey pubescence. Palpi dull dark greyish 

 black, broad at the base but quickly attenuating after the bend to a rather 

 blunt tip, about four times as long as the thick part is deep, densely clothed 

 with black bristles but with rather inconspicuous long white pubescence 

 about the base both above and below. Eyes with rather sparse and short 

 light grey pubescence, but almost or quite bare along the hindmargin ; facets 

 all small and equal ; in life (according to Brauer) they bear three or four 

 purple bands. Antennas black, slightly greyish ; the long hairs on the basal 

 joints not so conspicuous as in the male. 



Thorax with the black pubescence less obvious than in the male, and with 

 two widely separated stripes of rather inconspicuous whitish grey pubescence 

 running down the disc ; pleurae with larger clumps of greyish white pubescence 

 under the wing-base and all about the prothorax. Scuiellum with numerous 

 scattered thin light grey hairs interspersed all over the disc. 



Abdomen with the pubescence much shorter than in the male, and with 

 more signs of grey side-flecks and whitish pubescence ; there is a small 

 whitish grey triangle of pubescence at the middle of the hindmargin of each 

 of the second to sixth segments, and there are large grey side-flecks on the 

 second segment which are rather conspicuous (partly through the whitish 

 pubescence on and about them) even to the hindmargin and side corners ; 

 there is also a considerable amount of whitish pubescence on the sides of the 

 two basal segments, at the extreme hind corners of segments, on most of the 

 hindmargin of the fifth segment though not connected with the middle spot, 

 and as hindmarginal fringes on the sixth and seventh segments ; the third to 

 sixth segments have very narrow inconspicuous light grey hindmargins. 

 Belly with very extended rather conspicuous whitish pubescence, especially 

 as fringes along the hindmargins. 



Legs black ; pubescence on the femora dense and black but not so long as 

 in the male, and the bare space beneath the front femora just as in the male ; 

 middle tibitB with obvious though sparse rather long dorsal ciliation on the 

 middle part ; hind tibiae with a coarse dense black dorsal ciliation except 

 about the base. 



Wings, squamae, and halteres as in the male. 



Length about 13 mm. ( (J ), or 14 mm. ( ? ). 



This species may be known at once from any other British species of 

 the extended genus Tahanus by its wholly black legs ; the only other quite 



