ENTOMOLOGY 921 
segment somewhat elongate, its basal portion rather long with a small basal dorsal tooth, much 
wider and longer than the annulate portion; frons about six times as long as wide, gradually nar- 
rowed below, until at the subcallus it is about two-thirds as wide as at the vertex; frontal callosity 
filling most of the width of the frons at the subcallus, about twice as long as wide at base, gradually 
narrowed to the conspicuous, linear, median prolongation which stops about midway to the 
vertex; eyes uniformly colored inlife. Thorax: dark brown above, brown pilose; yellowish brown on 
sides and venter, and abundantly furnished with rather long yellowish hairs. Abdomen: tergites 
one, two and base of three brown, the remainder dark brown with mostly black pilosity; first 
two sternites brown, the remaining dark brown with the posterior margin of each lighter and 
furnished with a marginal row of backwardly directed bright yellow hairs. Wings almost uniformly 
fumose; costal margin plainly darkest. Squamae brown. Halteres brown, with the knob mostly 
pale yellowish. Legs: fore femora dark brown with black hair; fore tibiae of the same color, 
except the basal third which is yellowish white; fore tarsi slender, black; middle and hind legs 
yellowish brown; tarsal segments partially infuscated apically. 
BELGIAN Congo. — Lubutu, female holotype and sixteen female paratypes, 
January 1915; Lusengo (on the Congo River), seven female paratypes, Decem- 
ber 23, 1926; Bumba, two female paratypes, December 27, 1926; Lisala, five 
female paratypes, December 28, 1926; Ukaturaka, four female paratypes, 
December 24, 1926. Ponthierville, one female paratype, December 27, 1923 
(Mich. Bequaert). Uele River, eighteen female paratypes (J. Rodhain). 
In the rain forest area of the Belgian Congo, 7’. obscurehirtus is more com- 
monly represented by the form described above in which the base of the fore 
tibiae is not so conspicuously white; the frons is wider at the vertex and more 
narrowed toward the subcallus. The color is on the whole darker. In the color- 
ation of the legs the var. lwbutwensis approaches 7’. obscurior Ricardo, but that 
species has a wider frons, the wings darker, and the beard dark brown. 
Tabanus ianthinus Surcouf 
Tabanus tanthinus Surcouf, 1907, Bull. Mus. Hist. Nat. Paris, XIII, pp. 212 and 258 (¢; Upper 
Congo); 1909, ‘Et. Monogr. Taban. Afrique,’ pp. 46 and 53, PI. II, fig. 4 (¢). 
Tabanus rufocanus “Ricardo” Surcouf, 1907, Bull. Mus. Hist. Nat. Paris, XIII, p. 258 (as a 
synonym of 7. 1anthinus). 
BELGIAN Conao. — Uele River; Bambili (J. Rodhain). Kisantu (Goossens). 
Kabinda (J. Schwetz). Leopoldville; Nouvelle Anvers, December 22, 1926; 
Lusengo, December 23, 1926; Coquilhatville, one female and one male, De- 
cember 19, 1926. 
Male (undescribed). — Length of body, 17 mm.; width of head, 6 mm.; length of wing, 13 mm. 
Colored exactly like the female. Fore tibiae with a conspicuous white ring, covering more 
than the basal third; fore tarsi distinctly, though moderately widened. Head very large, hemi- 
spherical; eyes holoptic; the zone of larger facets occupying about the upper three-quarters of the 
eye, narrowly separated from the occipital margin. Antennae more slender than in the female. 
One specimen from Coquilhatville. 
T. tanthinus is strictly West African, being known from Sierra Leone, the 
French and Belgian Congo, and Angola. 
Tabanus par Walker 
Tabanus par Walker, 1854, ‘List Dipt. Brit. Mus.,’ V, Suppl. 1, p. 235 (9; Port Natal). Austen, 
1909, ‘Illustr. African Blood-Suck. Flies,’ p. 76, Pl. II, fig. 5 (¢). 
Atylotus cereolus Bigot, 1892, Mém. Soe. Zool. France, V, p. 644 ( 9; East Africa). 
