418 TABANID^ 



leaving tlie widest part of the small facets at about tlie middle of the head 

 (when viewed sideways) ; the eyes touch for twice the extreme length of the 

 frons ; in life (according to Brauer) they are grey, dark at the margin, green 

 below with a purple shimmer, and on the lowest quarter with three purple 

 bands of which the upper one is cleft towards its inner end. Antennje clear 

 dull reddish orange ; two basal joints obscured by numerous short black 

 bristles on all the upper part of the basal joint and on a circlet round the tip 

 of the second joint, though the bristles on this circlet are pale on the under- 

 side, and the underside of the basal joint has some longer (though not long) 

 thin pale hairs ; basal joint rather small and extending dorsally only slightly 

 cap-like over the second ; third joint with the dorsal hump on its basal 

 segment very slight, so that this segment is almost regularly blunt conical 

 and twice as long as its thickest part, while near its base it bears some tiny 

 black dorsal bristles ; the next three segments of the third joint are almost 

 quadrate and are not quite so thick as the tip of the basal segment, while 

 the end segment is thinner and tapering, and about as long as two of the 

 previous annulations. 



Thorax shining grey black, with five nearly equidistant light grey stripes 

 which become rather vague soon after the suture, the side stripes being the 

 least defined ; praealar calli ferruginous ; pubescence fairly abundant, nearly 

 erect, light grey but with a few black hairs inconspicuously intermixed above 

 the wing-bases, and on the prsealar calli and even right across and all about 

 the middle of the disc; pleurae ashy grey, clothed with dense light grey 

 woolly pubescence which is however less dense on the lower part. Scutellum 

 grey, but the disc not so pale as the light grey thoracic stripes ; 

 pubescence longer, more erect, paler grey, and perhaps more abundant than on 

 the thorax. 



Abdomen small and tapering, about one and a quarter times as long as the 

 thorax and scutellum together, narrower at its base than the thorax and 

 steadily tapering to a point so that certainly the fifth to seventh segments 

 form a conical end ; when seen from above greyish black with a broad 

 ashy grey dorsal stripe which on the fourth segment and onwards widens and 

 becomes vague until it dies out on the sixth and seventh segments ; this 

 dorsal stripe and the greyish black part occupy about the middle third of the 

 abdomen on the second to fourth segments, but outside them the abdomen is 

 mainly dull ferruginous, though the third and fourth segments have a con- 

 siderable blackish grey space near each side, so that the ferruginous markings 

 almost form connected flecks of the usual Tahanus type ; on the fifth to 

 seventh segments as the middle grey part becomes undefined so the grey 

 side-flecks become more apparent on at any rate the fifth and sixth 

 segments ; when seen from above no pale triangles are visible on the middle 

 of the hindmargins but the hindmargins themselves are rather broadly ashy 

 grey, and the pale yellowish pubescence on the hindmargins of the four basal 

 segments becomes conspicuous on about the middle third and after a slight 

 gap obvious but less conspicuous on the rest of those hindmargins, but on the 

 fifth and sixth segments the middle quarter of the hindmargins bears less 

 conspicuous pale pubescence ; seventh segment rather distinctly transversely 

 rugose • the abdomen when viewed from behind apjiears mainly very light grey 

 on the broad dorsal stripe but more yellowish towards the sides, and with the 

 hindmargins (especially on the four basal segments) broadly pale yellowish 

 grey, and with numerous vague greyish brown flecks which upon a little 

 tilting indicate a row of brown spots on each side of the broad light grey dorsal 

 stripe and with traces of another fainter row of spots nearer each side ; 

 pubescence slojiing, mainly blackish and rather short, except for the pale 

 hindmarginal pubescence mentioned before which spreads up a little on to the 

 disc about the middle of each hindmargin and extends on to the ferruginous 

 part and the grey side-flecks, while the pubescence becomes longer and 

 stronger about the end of the seventh segment and on the basal side lamellae 

 of the genitalia, but leaves the rest of the genitalia almost bare. Belly ashy 

 grey, but obscurely ferruginous on the three or four basal segments except for 

 a large black spot on the middle of the two basal segments, and with the 

 hindmargins (especially of the third, fourth, and fifth segments) pale ; 

 pubescence short, depressed, pale (almost whitish), but beneath the seventh 



