ENTOMOLOGY 927 
on mid-ventral line and one on each side, and a narrow posterior gray margin; the next three similar 
to the second, but the black increases at the expense of the pale brown toward the apical segments; 
the sixth black with a very narrow gray margin; the seventh black. Wing dark, with three hyaline 
patches, one large across the basal, anal, and axillary cells, another across the discal, first posterior, 
and first submarginal cells, and a third in the second submarginal cell; the first two are quite 
extensive and irregular; the wing is marked as in the female, but the dark color is somewhat less 
intense. Legs black, as in the female. 
BELGIAN Conao. — Between Thysville and Kinshasa, one female holo- 
type, taken in the train, November 25, 1926; Lubutu, one female paratype, 
January 1915. Stanleyville, two female paratypes, and one male allotype, as 
prey of Bembix bequaerti Arnold var. dira Arnold (H. Lang and J. P. Chapin). 
Specimens of 7’. marmorosus, in the Congo Museum, from Mawambi (C. 
Christy), Lokandu (Burgeon), and Niemba (Pons), not now before me, prob- 
ably all belong to the var. congotcola. 
Tabanus obscurefumatus Surcouf 
Tabanus obscurefumatus Surcouf, 1906, Bull. Mus. Hist. Nat. Paris, XII, p. 523 ( 9; San Benito 
River, French Congo). Austen, 1909, ‘Illustr. African Blood-Suck. Flies,’ p. 94, Pl. VII, fig. 50 
(9). 
BELGIAN Conco. — Ganda Sundi, one female (de Briey). Medje (H. Lang 
and J. P. Chapin). 
This species is strictly West African, being known from Sierra Leone, 
Southern Nigeria, Cameroon, Sao Thomé, and the French, Belgian, and Portu- 
guese Congo. 
The male of 7’. obscurefumatus is as yet undescribed. I have seen two males, 
described below, which I provisionally refer to this species. The wings are 
more nearly hyaline than in the female; but the males of two related species, 
T. billingtont Newstead and 7. marmorosus Surcouf, differ in a somewhat simi- 
lar manner from their respective females. 
Male (undescribed). — Length of body, 16 mm.; width of head, 6mm.; length of wing, 14 mm. 
Body largely gray pollinose; dorsal abdominal segments beyond the second brown basally; 
segments six and seven almost wholly brown; legs dark, except the fore tibiae which are white 
on basal two-thirds or more. Wing nearly hyaline, with costal border before the stigma and extreme 
apices of marginal and submarginal cells clouded; all the posterior cells open; no stump on the 
anterior branch of the third vein. Head large, hemispherical; triangle of vertex very small; 
eyes contiguous for a long distance; frontal triangle gray, with the upper angle yellowish brown; 
face and cheeks white; beard white; palpi slightly darker than the face, small; proboscis black 
apically. Antenna black; first segment enlarged, more plainly at apex than at base, distinctly 
produced above; second segment small, hardly half as long as the first; third segment with the 
dorsal basal angle not very prominent; annulate portion only about half as long as the basal, rather 
slender. Area of enlarged facets of the eyes extensive, surrounded by small facets, most of which 
are below. 
Two specimens from Stanleyville, Belgian Congo, the former dated April 7, 1915, and the latter 
March 1915, collected by H. Lang and J. P. Chapin, as prey of Bembix bequaerti Arnold var. dira 
Arnold. 
The male here described suggests the same sex of 7. billingtont and T. marmorosus, but is 
readily separated from both by the almost hyaline wing and differently colored abdomen. 
Tabanus quadriguttatus Ricardo (1908, Ann. Mag. Nat. Hist., (8) I, p. 270; 
¢; Nguelo River, Usambara, Tanganyika Territory) has been recorded from 
