940 REPORT OF THE HARVARD AFRICAN EXPEDITION 
only from the Katanga and southern Kasai. It appears to be related, not to 
T. diversus Ricardo (as previously stated), but rather to 7’. quadrisignatus 
Ricardo, from which it may be separated as follows: 
Larger (13.5 to 15 mm.), with more reddish-brown abdomen and more yellowish abdomi- 
nal markings; dorsum of thorax with four yellowish longitudinal stripes; wings 
slightly, but distinctly smoky. Frons four to four and one-half times as long as wide 
at vertex, the basal callus about twice as high as wide............. Ve quadrisignatus. 
Smaller (9.5 to 12 mm.), with blackish abdomen and grayish white abdominal markings; 
dorsum of thorax with four grayish white stripes; wings hyaline. Frons about three 
times as long as wide at vertex, the basal callus but little or not higher than wide. 
T. lufirensis. 
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Tabanus quadrisignatus Ricardo 
Tabanus quadrisignatus Ricardo, 1908, Ann. Mag. Nat. Hist., (8) I, p. 320 ( 9; Ruwe, Katanga, 
Belgian Congo). Austen, 1909, ‘Illustr. African Blood-Suck. Flies,’ p. 111, Pl. IX, fig. 69 (¢). 
BreuLGIaAN Conco.— Kambove; Lufupa River to Lubudi River; mid- 
Lufira (S. A. Neave). Sampwe to Lukafu (Valdonio). Elisabethville, October 
and November (Mich. Bequaert). Renzi (Uele); Bafuka (Uele); Wandu 
(Uele) (J. Rodhain). Faradje (H. Lang and J. P. Chapin). Leopoldville. 
Inongo (J. Maes). Kabinda (J. Schwetz). Wombali (Vanderyst). Moto 
(Burgeon). 
NORTHERN RuHopusia. — Kafue River, October 1923 (Mich. Bequaert). 
A widely distributed species, known from Sierra Leone, Southern Nigeria, 
the French and Belgian Congo, Uganda, Tanganyika Territory, Northern 
Rhodesia, and Nyasaland. It appears to be an insect of savanna country. 
Tabanus ustus Walker 
Tabanus ustus Walker, 1850, The Zoologist, VIII, Appendix, p. xev (o*; Port Natal). Austen, 
1909, ‘Illustr. African Blood-Suck. Flies,’ p. 108, Pl. IX, fig. 65 ( ¢). 
Tabanus bovinus Loew, ‘ Dipteren-Fauna Siidafrikas,’ I, p.38(¢). Not Tabanus bovinus Linnaeus. 
Atylotus namaquinus Bigot, 1892, Mém. Soc. Zool. France, V, p. 646 ( 2; Port Natal). 
Tabanus temperatus Walker, 1856, ‘Insecta Saundersiana,’ I, Dipt., p. 451 ( @; Port Natal). 
BELGIAN Conco. — Mayombe (Cabra). Upper Lualaba; mid-Lufira; Lu- 
fupa River to Lubudi River (8S. A. Neave). Renzi (Uele); Dungu (J. Rodhain). 
Niangara (H. Lang and J. P. Chapin). Elisabethville (Mich. Bequaert). Be- 
tween Ankoro and Kiambi. 
NORTHERN RuHopssi4. — Victoria Falls (H. C. Raven. — U.S.N.M.). 
All the specimens which I have seen from the Belgian Congo belong to the 
var. disjunctus Ricardo (Tabanus disjunctus Ricardo, 1908, Ann. Mag. Nat. 
Hist., (8) I, p. 325; 9; Lutete, Lower Belgian Congo), which, however, is 
hardly worthy of recognition. It differs only in the color of the wings, which 
in the typical 7’. ustus, of South Africa, are strongly tinged with brown; while 
in the more northern var. disjwnctus they are mostly subhyaline and slightly 
infuscate toward the anterior margin. So few South African specimens appear 
to exist in collections that it 1s impossible to decide upon the value of so shght 
a character. 
