28 Mr. E. E. Austen on new 



linear, drab-grcy median stripe, inconspicuous by comparison 

 Avith the truncate median triangles on tlie third, fourth, and 

 fifth segments; extreme hind margins oi: second and 

 following segments drab-grey ; lateral borders of dorsum 

 buff, clothed with whitish-grey pollen and silvery-white hair, 

 and narrowing from base to tip; dark area of dorsum 

 clothed with minute black hairs ; ventral surface of first six 

 segments ochraceous-bulf, clothed with minute, appressed, 

 pale yellowish hairs, fifth and sixth segments with a dark 

 greyish blotch on each side ; ventral surface of seventh 

 segment dark grey, clothed with the usual, erect, coarse 

 black hairs, and with minute, appressed, pale yellowish 

 hairs on each side. Wings with a faint sepiaceous tinge, 

 anal cell raw-umber-coloured ; veins mummy-brown, rather 

 coarse-looking; stiyma long, mummy-brown, sharply deiined 

 and conspicuous. Squauice se[)ia-coloured, fringed with 

 minute, pale yellowish hairs. Halteres : knobs yellowish- 

 white, stalks buff. Legs : femora and tibiae cinnamon- 

 coloured, light grey pollinose, and clothed with pale yellowish 

 or whitish hair ; distal halves of front tibiie brown, hind 

 femora mouse-grey above and at base ; front tarsi clove- 

 brown, second, third, and fourth joints cousideraljly ex- 

 panded ; middle and hind tarsi dark brown, extreme base of 

 second and following joints, and first joint except tip 

 cinnamon-coloured. 



Anglo-Egyptian Sudan : Bahr-el-Ghazal, about thirty 

 miles west of llumbek, "on or near the Khor Gorman, in 

 the neighbourhood of Yei's village," 18. iii. 1911 (F. C. 

 Se/ous). 



It may be mentioned that it would seem probable that 

 Tahanus laverani, Surcouf, to which reference is made in 

 the diagnosis of the species described above, is in reality 

 T. unilincatus, Lw., but that the description of the latter 

 (Ber. Akad. Wiss. Berlin, 1852, p. 058) is so iMComjjlete 

 as to render absolutely certain determination imj)0!>sible. 

 7'. laverani was met with by Mr. Scions in some numbers 

 at the same place and on the same date as the type of the 

 species just described, and was also found plentifully at 

 other localities in the vicinity. Although T. laverani was 

 formerly regarded as a purely "West African species, the 

 INluseum collection now includes specimens of it from the 

 Bahr-el-Ghazal, Nyasaland Protectorate, and Portuguese 

 East Africa, besides others from the localities in West 

 Africa recorded by the present writer in his ' Illustrations 

 of African Blood-sucking Flies' (1909). 



