NOTES ON THE NOMENCLATURE OF CERTAIN AFRICAN TABANIDAE. 1 51 



(or spots) on which hair is usually black or ochreous, clothed with minute, appressed, 

 glistening silvery white hairs, which however, at least on each side of median olive- 

 grey area, are often largely replaced by similar ochreous hairs ; lateral borders 

 of fourth and following tergites, as well as (at least in part) hind border of fourth 

 tergite, clothed with glistening, silvery white hair, similar hair also usually visible 

 on lateral margins of third tergite, towards posterior angles ; dorsum except as 

 stated clothed with appressed black hair ; venter isabella-coloured or light brownish 

 olive, clothed with minute, appressed, whitish or yellowish white hairs. Wings : 

 veins mummy-brown ; first posterior cell variable as usual as regards distance 

 from hind margin at which it is closed, sometimes closed on margin itself, or even 

 in one or other wing narrowly open. Squamae cream-buff. Halteres : knobs 

 fuscous, stalks cinnamon-buff. Legs : coxae neutral grey, clothed with whitish 

 hair, anterior and inferior surfaces of femora clothed, at least in part, with black 

 hair, femora elsewhere clothed with yellowish hair, tibiae and tarsi clothed with 

 minute, appressed, ochreous hairs, extensor surfaces of hind tibiae and hind tarsi 

 clothed, at least in part, with black hair ; front femora blackish brown at base and 

 sometimes also on greater part of under side, joints of front tarsi often mummy- 

 brown or dark brown at tips above, those of hind tarsi similarly marked, or some- 

 times entire upper surface of hind tarsi, except base of first joint, dark brown. 



Tanganyika Territory : Itigi, iv, 1917 {Dr. G. D. H. Carpenter). Type and 

 3 para-types, taken 18.iv.l917 ; 1 para-type, taken 15, iv, 1917, " on low herbage "; 

 1 para-type, taken 6.iv.l917, " hovering while feeding from composite flower ; 

 looking much like a Bomhylius.'' All foregoing presented by Imperial Bureau of 

 Entomology, in whose possession are two other para-types, taken by Dr. Carpenter 

 at same time and place as specimens already mentioned. 



So far as it is possible to judge from the $ alone, this species, which is named in honour 

 of its discoverer and does not resemble any African Pangonia hitherto described, 

 presents, apart from the venation, all the characteristics of a Corizoneura, to which 

 genus it would have been assigned were it not that its posterior cell seems normally 

 to be closed before reaching the wing-margin. Should the ^ prove to have processes 

 at the tips of the first and second joints of the front tarsi, Pangonia carpenteri, despite 

 the transitional character of its venation, would more fittingly be placed under 

 Corizoneura, so long as the independence of the latter be maintained. 



Genus ThriambGutes, Griinb. 



Thriambeutes fuscus, sp. n. 



cJ. — ^Length (1 specimen) 11 '14 mm.; width of head 4*25 mm.; length of wing 

 10'5 mm. 



Dorsum of thorax sepia-coloured, with traces of a faintly marked, paler, longitudinal 

 median stripe in front of transverse suture, pleurae and pectus mummy-brown ; abdomen 

 uniformly blackish broivn ; wings mummy -brown, tvith a clear oblique transverse streak, 

 commencing on anterior transverse vein {its base extending from commencement of 

 lower border of distal fourth of first basal cell to proximal extremity of first posterior cell), 

 including rather more than proximal third of discal cell, proximal extremity of fourth 

 posterior cell, distal extremity of second basal cell, and upper border of proximal tivo- 

 thirds of fifth posterior cell, but not reaching hind margin ; legs blackish brown or black, 

 middle tarsi cream-buff, last joint and tips of preceding joints cinnamon-brown. 



