Genera and Species of 'Vnhaindx. 33 



before reacliing the hind margin, tlioui;:!). when the abdomen 

 is viewed at a low angle from behind, a small grey spot, 

 representing the end of the eorrespoudiug stripe, is some- 

 times indistinctly visible on the seventh segment, on each 

 side of the middle line ; the inner edge of the spots on the 

 second, third, and fourth segments is somewhat oblique, and 

 the spots on the fourth and fifth as well as those on the 

 subsequent segments may not reach the hind margins ; 

 median stripe continuous, deeper in colour, less clearly 

 defined, and sometimes narro^ver than the grey stripes just 

 described, commencing at base of abdomen and dying away 

 on sixtli segment ; venter light grey, clothed with minute, 

 appressed, yellowish hairs, hind margins of segments cream- 

 buff, fl'inf/s hyaline, costa dark brown, other veins mummy- 

 brown ; stif/ma elongate, mummy-brown or raw^-umber- 

 coloured. Halieres : knobs cream-coloured, stalks somewhat 

 darker. Legs : coxse grey, clothed with whitish hair; front 

 femora slate-grey, clothed with appressed whitish hair, mixed 

 M'ith longer, erect, black hairs ; middle and hind femora 

 isabella-coloured or drab, with a dark grey or dark greyish- 

 brown band on distal third ; tibiie buff, clothed (except tips 

 of front tibiae and posterior surface of tips of hind tibire) 

 with minute, appressed, glistening yellowish-white hairs, 

 distal fourth of front tibia? clove-brown, tips of hind tibiae 

 brown ; front tarsi clove-brown, three middle joints slightly 

 expanded ; middle and hind tarsi seal- brown or dark mummy- 

 brown, first and second joints of hind tarsi, except tips, 

 sometimes paler. 



Portuguese East Africa : Umbelusi River, 20 miles south 

 of Lorenzo Marques, December 1910 (C TV. Howard). 



In size and general appearance the species described above, 

 ■which belongs to Surcout's ^'Thirteenth Group,'' is not 

 unlike the typical form of Tubanus sufis, Jaenn., although 

 distinguishable, inter alia, by the front being of uniform 

 breadth, instead of noticeably wider above ; by the much 

 darker coloration of the frontal callus, &c. ; by each of the 

 paired grey abdominal stripes being practically continuous, 

 instead of broken up into a series of oblique spots; by the 

 wings having a distinct stigma; by the anterior branch of 

 the third longitudinal vein not being augulate nor provided 

 with an appendix at the base; and by the wings lacking the 

 conspicuous infuscation of certain veins or portions of veins 

 that is characteristic of T. sufis. 



Ann. c& Mag. X. Ilist. Ser. 8. Vol. Ix. 



