2. TABANUS 419 



segment and the genitalia witli numerous longer stronger curved black hairs. 

 Genitalia (when seen from above) blackish, longer and narrower than the 

 seventh abdominal segment, with a quadrate dorsal plate and two smaller 

 basal corner i:)lates, and between these dorsal and side plates with elongate 

 narrow ridged processes which extend beyond even the dorsal plate, and 

 then between their projecting ends (and projecting beyond them) with a pair 

 of terminal lamellae whose outer sides slope inwards after the end of the 

 ridged i)rocesses. 



Legs greyish black ; tibife luteous with the apical third or more of the front 

 pair blackish, and just the tip of the posterior pairs blackish or brownish • 

 posterior tarsi rather ferruginous about the base ; front tibia3 rather thickened 

 towards the tii?, and the front tarsi rather dilated and deep black. Pubescence 

 on the front coxae dense long and greyish white ; behind the front and 

 beneath the hind femora abundant but thin, long, conspicuous and greyish 

 white, being even longer and woollier behind and beneath the middle femora 

 which also bear a few black hairs behind the tip ; front femora with a few 

 black hairs above and behind near the tip, but with the deep black bare stripe 

 on the underside conspicuously contrasted with the grey pruinose sides ; 

 the other pubescence on the posterior femora equal short depressed and pale ; 

 tibiae with short rather silky pale pubescence except for the stronger black 

 dorsal and apical pubescence and the middle tibiae with no long pubescence 

 except a little on the upper side, and the hind tibiae with a delicate pale 

 postero-ventral ciliation and a coarser denser mainly black dorsal one ; tarsi 

 with short black depressed bristly pubescence ; the usual " touch-hairs " 

 about the tip of the front tibite, beneath the basal joint of the front tarsi, 

 and at the apical side corners of the other joints. 



Wings hyaline ; veins blackish, but pale brown on the strong medi- 

 astinal, subcostal, radial, and cubital veins up to nearly opposite the tip of the 

 discal cell, and on the stem and lower branch of the postical vein ; stigma 

 rather pale brown and only formed by the swollen end of the subcostal vein. 

 Squamae yellowish brown with dark brown margins and the usual large and 

 conspicuous pale tuft of pubescence about the angle, Halteres yellowish 

 brown, with the base of the knob almost blackish. 



Greyer and broader than the male. Frontal stripe (fig. 235) greyish yellow, 

 sometimes almost parallel-sided but usually rather contracted at its lower end, 

 not quite four times as long as its broadest part ; lower callus quadrate, 

 moderately shining black, rather large, but not touching the eyes at the sides 

 nor extending at all upwards towards the middle callus, and well remote from 

 the frontal triangle ; middle callus black but hardly shining, isolated, nearly 

 as broad as the lower callus, orbiculate but sometimes cleft above and 

 sometimes extending downwards to a point and thereby becoming elongate 

 triangular and nearly twice as long as broad, but never at all linear, widely 

 separated from either lower or upper callus and well away from the eyes ; 

 upper callus often vague, or large but not shining black being more or less 

 obscured by dust, but when distinct nearly as wide as the space between the 

 eyes at the upper eye-angles but quickly sloping inwards from the eyes until it 

 occupies only about half the width of the frons, incurved on its upper margin 

 and divided all the way down by a narrow greyish yellow line • frontal triangle 

 shining black (or chestnut at its upper angle) all across the upper half, but 

 with the lower half (against the antennae but hardly extending to the eyes) 

 bright greyish yellow, the extreme edge against the eyes being dusted greyish 

 and connected at about the level of the antennae with the greyish yellow cross- 

 band, and with a narrow middle furrow down the middle of this cross-band ; 

 pubescence on the frontal stripe extremely short and nearly all black, not 

 scarce, but the lower callus quite bare ; frontal triangle quite bare. Face 

 yelloAvish grey, but with a broad darker brownish undefined band between 

 the antennae and the eyes ; face clothed with yellow pubescence, but the 

 lower part of the side-cheeks and the mouth region bearing abundant longer 

 pale yellow pubescence ; back of the eyes with a narrow bare dull yellow 

 postocular rim, which widens a little when quite close to the upper eye- 

 angles, and behind that with a short dense stubby ciliation which may be 

 darker and shorter still below but which becomes brownish orange right up to 



