ENTOMOLOGY 915 
Bolobo; Lulonga; Ukaturaka; Lisala; Nouvelle-Anvers; near Irebu; Bumba; 
Mistandungu; La Lowa; Lubutu; a common species on board ship on the 
Congo River. Medje; Stanleyville, several females as prey of Bembix bequaerti 
Arnold var. dira Arnold (H. Lang and J. P. Chapin). Ruchuru River, attacking 
hippopotamus, April 17, 1927 (R. P. Strong). 
There is considerable variation in the color of the legs, upon which character a 
number of varieties or subspecies have been based, as may be seen from the 
following key: 
1. Legs entirely black; hind tibiae fringed on the inner and outer side with golden yellow 
]oL ee Ae 207 i a Acre Ae Ee SO ee a ee var. atripes (van der Wulp). 
Tnorr ago AEORINGE well, 05 oF cuhid = fv ab Se sola ab Wialps oa Ga ad A lawn be hls 2 
2. Tibiae and tarsi all black; hind tibiae fringed with black pile....... var. nigripes Surcouf. 
eGR SMa re ADS MV NNCG See irs eh 257, Go A corageis ve RF Aa eiacek =o nie NS po ah eon ee eo Vas 3. 
3. Fore tibiae dark brown, lighter at the base which is clothed above with golden pile; 
middle and hind tibiae greenish yellow; hind tibiae fringed on the outer side with 
ey Ole te tia eat ace, teceess 3 Vd AA cia Meee oF eee eee subsp. niloticus Austen. 
Fore tibiae entirely black and covered with black pile; middle and hind tibiae greenish 
ISTE | OLR carte fot en whe ee Soe, © cere PPR eae nad Ns, oy aie tar Gr Sei DE ete aS, SIG EB ocees 4, 
4. Hind tibiae fringed on the outer side with golden pile............... var. mixtus Surcouf. 
Hind tibiae fringed on the outer side with black pile, rarely mixed with a few golden hairs 
Dee ROM BSC ce elke ae ee Scie us See wis PER ANE ik Le OE a typical fasciatus. 
Most of these variations appear hardly worthy of distinction by name. They 
show little if any geographical segregation, except in the case of the subspecies 
niloticus Austen (1906, Second Rept. Wellcome Res. Lab. Khartoum, p. 62, 
Pl. VI; 2; Anglo-Egyptian Sudan), which is perhaps restricted to the Sudanese 
savannas north of the forest belt (Upper Guinea Savanna, Ubangi Savanna, 
and Sudanese Savanna Districts of J. P. Chapin, 1923, American Naturalist, 
LVII, p. 121, fig. 11), where it is known from Gambia, Dahomey, Northern 
Nigeria, French Equatorial Africa, Anglo-Egyptian Sudan, Uganda, and the 
Nyanza Province of Kenya Colony. There is no definite record of the subsp. 
niloticus having been taken in the Belgian Congo, but it should be looked for in 
the region of Irumu. 
The var. atripes (Tabanus atripes van der Wulp, 1885, Notes Leyden Mus., 
VII, p. 75, Pl. V, fig. 4; 2; Ogowé, Gaboon) has been reported from the Belgian 
Congo by Surcouf (1912, Bull. Mus. Hist. Nat. Paris, XVIII, p. 144) on the 
strength of a female from Boma (Cammermeyer). I have not seen this specimen 
and I am unable to decide whether it was correctly named. 
The majority of the specimens I have seen from the Belgian Congo and 
Liberia belong to the var. nigripes Surcouf (1909, Bull. Mus. Hist. Nat. Paris, 
XV, p. 537; Belgian Congo). A few females from Lisala, Coquilhatville, Ukatu- 
raka and Bolobo have the middle and hind tibiae more or less yellowish and seem 
to represent the typical 7’. fasciatus. 
The var. mixtus Surcouf (1914, Rev. Zool. Afric., III, p. 472) was based upon 
females from Yumbi and Bolobo, Belgian Congo. It is evidently the form 
intermediate between typical 7’. fasciatus and the subsp. niloticus, recorded by 
Austen from a number of localities in the Gold Coast, Nigeria, the Belgian Congo, 
and Uganda. I have not seen it. 
