igii.] G. RiCAKDO : Revision of the species of Tahanxi?,. 243 



Related to Tabanus asiur , Erichs. 



Body ovate, black with rather long and dense pu])e.scence. 

 Head comparatively rather small, ash}^ coloured, pruinose and with 

 the wide frontal stripe long and densely pale yellow haired. Fore- 

 head above antennae and the narrow band below, each side of eyes, 

 black, shining. Frontal callus black, shining, short (but equal in 

 width to the front), eyes shortly but distinctly yellow haired with 

 three wide bands, ocelligerous tubercle small. Palpi black and black 

 haired, with apex moderatel}" acute. 



Antennae redchsh brown, at base black haired, the third joint 

 at base with no tooth, brown testaceous, apex and upper side 

 more or less \\idely black. Thorax, pleurae, breast and scutellum 

 all wholly black with long and densely yellowish (shining white) 

 hairs. Abdomen short, wide, ovate, stout, black, the three first 

 segments at sides fulvous, the fourth with golden or reddish hairs, 

 with shining luteous rather long and dense pubescence, the other 

 segments with luteous pubescence ; under side black, shining, the 

 last segments alone with very narrow pale incisions, the first seg- 

 ments mostly with l:>lack incisions, the three last alone luteous 

 haired. Wings subhyaline, stigma brown, all veins black, middle 

 transverse veins clouded, the third vein with an appendix, clouded 

 at its base, halteres brown, apices white. vSquamae ashy coloured, 

 margined with white. Femora all black and black haired , anterior 

 tibiae yellow, anterior half and tarsi brown, intermediate tibiae 

 and tarsi and all posterior ones wholly yellow with white hairs. 

 6-7". Portsch., Horae, etc., p. 178. 



This species apparently differs from Tabanus astiir which was 

 described from vSiberia in the absence of the small tooth, the frontal 

 callus being black, not grey, the thorax and abdomen more yel- 

 low haired, the femora black haired instead of yellow haired, the 

 wings subhyaline, not black-brown. 



It must be nearly alhed to Tabanus pulchriventris, described 

 on the next page by the author, from Chinese Mongolia. 



Tabanus tenebrosus, 9 , Coquillet. 



Proc. U. S. Nat. Mus., xxi, p. 310 (1898) ( nee Walker). 



Female. Differs from Tabanus trigonus as follows. Head aljove 

 the antennae yellowish grey, pruinose, tooth of third joint of 

 antennae very small, hairs of occiput, of under .side of the head and 

 on the pleurae, white. 



Abdomen opaque, black, sometimes a reddish spot on sides ol 

 the second segment, wholly greyish pruinose, the median triangles, 

 posterior and lateral margins of segments 2-6 a lighter grey than the 

 remainder of the abdomen, the darker markings consist principally 

 of pairs of spots bordering the median triangles; venter black, 

 brownish grey ])ruinose in the middle, the sides a lighter grey. 

 Wings hyaline, stigma pale yellowish. Length 18—20 mm. 



Four specimens from Japan. 



