402 TABANID^. 



pale greyish yellow hairs beneath the wing-base. Scutellum greyish black, 

 with suberect black pubescence similar to that on the disc of the thorax and 

 with pale greyish yellow hairs round the margin. 



Abdomen rather tapering to a point, usually conspicuously ferruginous on 

 the sides of the four basal segments for about the outer third of each segment 

 (or rather more on the second segment), but sometimes the ferruginous coloring 

 may be entirely absent, and in all cases large darkened spaces exist near 

 the front corners of the segments, and also in all cases a blackish dorsal 

 stripe on the middle third (or less) of the four basal segments which widens 

 out on the basal segment (spreading to all the base of that segment), while 

 all the segments after the fourth are blackish, but at the middle of the 

 hindmargin of each of the five basal segments there is a conspicuous greyish 

 yellow triangular spot Avhich does not extend much above the middle of the 

 segment, and the second to fifth segments bear (out on the ferruginous 

 coloring when present) a decreasing yellowish fleck on each side which slopes 

 from the front margin near the blackish dorsal stripe to the hindmargin, but 

 the outward slope decreases on each segment just as the size of the fleck 

 decreases, and on the fifth segment (if visible at all) is little more than a 

 faint upright yellow line ; when viewed from behind, the three rows of flecks 

 appear whitish and the side ones extend outwards along the hindmargins to 

 the sidemargins. Pubescence short and fairly dense, never long even at the 

 basal corners, mainly black but conspicuously yellow on the three rows of 

 yellowish flecks and on the sides of the hindmargins and to a large extent 

 about the hind corners of the sidemargins of the segments. Belly obscurely 

 light greyish orange about the sides of the four basal segments and with a 

 broad more or less blackish middle stripe down them, and with the hind- 

 margins of segments narrowly whitish ; pubescence very short, following 

 the ground colour. Genitalia greyish black, but ferruginous at the tip. 



Legs dull black, but the front tibi» obscurely ferruginous on about the 

 basal third, while all the femora at the extreme tip and all the posterior tibite 

 are conspicuously brownish orange (except for an ill-defined black tip to the 

 tibiae), and the posterior tarsi are slightly ferruginous about the base. 

 Pubescence fairly obvious and long, greyish white on the greyish black front 

 coxEe, and mainly pale on all femora and tibise but with many black hairs 

 behind and beneath, and with a dense row of very short black bristles on the 

 anterior margin of the shining black bare space beneath the grey-dusted front 

 femora, while the middle tibiae bear short black hairs on their upper side 

 intermixed amongst which are a few pale hairs ; the two spurs black ; 

 hind tibise with a long coarse antero-dorsal ciliation and a shorter finer 

 postero-ventral ciliation in which the hairs are pale on the basal portion but 

 become ^nore and more intermixed with black hairs until at the tip all the 

 hairs are black, the antero-dorsal ciliation containing more black hairs than 

 the postero-ventral one ; front tibise towards the tip, and front tarsi with a 

 few scattered " touch-hairs." 



Wings slightly brownish, with the usual anterior veins brownish orange 

 and the subcostal vein notably dark. Squamai (thoracal) blackish or dark 

 brownish glassy, with conspicuous dark thick margins and with very short 

 pale fringes ; alar pair more pellucid, with the margin narrower and 

 darker, and with the usual peculiar long yellow tuft near the angle. Halteres 

 whitish yellow to brownish orange on the knob, but darker on the stem. 



$ . Rather like the male, and distinguished from the two very large species by 

 the three obvious rows of light grey abdominal spots. Frontal stripe yellowish 

 grey ; lower callus shining black, moderately large ovate, distinctly not 

 extending out to the eyes aud hardly resting on the frontal triangle, but well 

 defined and continued upwards as a narrow neck to the narrowly elongate 

 middle callus ; ocellar space slightly darkened ; pubescence short and mainly 

 black on the upper part of the frontal stripe, becoming conspicuous about the 

 vertex because of its density, but mainly pale and depressed on the greyish 

 yellovv' sides of the lower part ; frontal stripe almost parallel-sided, about 

 four times as long as its broadest part ; frontal triangle pale greyish yellow, 

 quite bare. Face and jowls pale greyish yellow and clothed with abundant 

 yellowish white pubescence, but occasionally the pubescence on the ujjper 



