342 TABANID^ 



light grey spots just after the suture ; prsealar calli and vague lateral stripes 

 after the suture broadly but indefinitely dark ashy grey ; postalar calli ashy 

 grey towards the hindmargin, and this colour extending along the outer 

 thirds of the hindmargin and widening a little up on to the disc at the inner 

 ends : pubescence fairly long and abundant and composed of thin pale grey 

 or pale brownish grey hairs, except for a few black hairs on the prasalar calli 

 and about the sides after the suture. Pleura; covered with pale ashy grey 

 dust and bearing abundant shaggy pale greyish yellow pubescence and a 

 tawny tuft on the metapleurse, with a fairly conspicuous tuft of long black 

 hairs on the middle of the mesopleurge. Scutellum greyish brown, with 

 soft silky pale grey pubescence and with scarcely any admixture of black 

 hairs. 



Abdomen dull brownish black with the sides of the three basal segments 

 slightly or indistinctly ferruginous ; hindmargins of all the segments pale grey 

 and running up into shallow triangles at the middle ; when viewed from 

 behind there is a grey dorsal line which is conspicuous and fairly broad on 

 the sixth and fifth segments and is obvious (though not (juite extended to 

 the foremargin) on the fourth segment, and faint traces of this dorsal line 

 exist on the third or even on the second segment ; grey side-spots also exist 

 which are large on the sixth segment and which are almost connected with the 

 grey dorsal line and the grey hindmargin of the fifth segment, but on the fifth 

 segment the similar side-spots though large and roundish are separated from 

 the dorsal line and do not quite reach the foremargin ; on the fourth segment 

 there are similar grey spots, but on the third segment they may be smaller ; 

 the sidemargins of the third to sixth (and vaguely second) segments are 

 greyish and when viewed quite from behind are so broadly grey as to widely 

 touch the grey spots on the fourth, fifth, and sixth segments. Pubescence 

 rather long and almost erect, mainly black, but brownish yellow on the sides 

 of the basal segment and at the hind corners of the other segments (when 

 seen from above), while on the disc the pale hairs may be almost limited to 

 the pale grey hindmargins (especially on the widened middle triangles) but 

 the pale hairs may be scattered about on the disc and become more numerous 

 towards the tip, and when viewed sideways the sidemargins are seen to bear a 

 long yellow or brownish yellow dependent pubescence which becomes extra 

 distinct on the yellowish hind corners of the fourth, fifth, and sixth segments ; 

 when viewed from behind the pubescence on the basal segments of the abdomen 

 and on the scutellum appears longer and more busliy than in //. pJuvialis 

 and //. oussicorms. Belly uniformly ashy grey except on the narrow yellow 

 hindmargins and bearing sparse greyish white pubescence which though 

 mainly depressed is longer and more erect on the two basal segments, while 

 a few black hairs occur on the disc of the sixth segment and several on the 

 seventh segment. Genitalia greyish brown ; basal joint of the lateral lamelhe 

 about as long as the subquadrate second joint. 



Legs (especially the tibiae) rather more slender than in the other species, 

 greyish black with luteous annulations ; front coxas covered with very pale 

 ashy grey dust and bearing abundant long silky whitish yellow pubescence, 

 and the other coxae clothed similarly but less obviously ; front femora 

 obscured by grey dust and bearing long abundant pale fine-haired pubescence 

 behind but the pubescence behind the apical half black, and all the pubes- 

 cence on the underside whitish except at the tip ; posterior femora similarly 

 clothed but the less conspicuous pubescence black at only just the tip ; 

 front tibiae with the base indistinctly darkened (less so than in //. jilnvialis 

 and nnich less than in //. (■rassicortiis\ followed by a lu'oader luteous ring so 

 that the next darkening does not begin until just before or even just after 

 the middle and even then not so much blackened as in //. crassicorms ; middle 

 tibiae also mainly luteous Ijut with a blackish brown ring on the basal (not 

 at the absolute base), middle, and apical fifths, or they may have only a faint 

 narrow dark ring near the base, an indistinct dark band on the middle sixth, 

 and the apical eighth black ; hind tibiie with similar markings to those on 

 the iniddle til)iie 1)ut either with the middle dark band longer and more 

 distinct, or with a narrow basal l)and, an indistinctly brownish band on the 

 middle fifth, and the apical eighth blackish ; front tarsi black, but the 

 posterior tarsi brownish black after the luteous base; "touch-hairs" rather 



