918 REPORT OF THE HARVARD AFRICAN EXPEDITION 
plainly contradicted by the statement: “‘Antennarum dente elongato.”’ Accord- 
ing to Ad. Lutz (1907, Centralbl. Bakt. Paras., Abt. 1, Orig., XLIV, p. 138,) 
T’. fuscinevris is a South American species. 
As I shall attempt to show in the sequel, Tabanus bipunctatus van der Wulp 
is probably distinct from 7. ditoeniatus. I also doubt that the East Indian 
Tabanus pyrrhus Walker (1850, ‘Insecta Saundersiana,’ I, Dipt., p. 47, PL H, 
figs. 4 and 5; 9) is a synonym of 7. ditoeniatus, as claimed by Miss Ricardo 
and Sureouf. 
It is generally stated that 7. ditoeniatus occurs over the entire Ethiopian 
Region and extends into the Oriental Region as far as the East Indies, China, 
and Japan, but I suspect that several distinct species have been confused under 
this name. Perhaps 7. ditoeniatus is strictly South-and-East African. There is 
even a possibility that the South African insect generally called ‘‘ditoeniatus”’ 
is specifically different from that occurring in Mauritius and Réunion. Since 
Macquart’s time no specimens of 7’. ditoeniatus seem to have been obtained in 
those islands. 
Tabanus ditoeniatus var. bipunctatus van der Wulp 
Tabanus bipunctatus van der Wulp, 1885, Notes Leyden Mus., VII, p. 75, Pl. V, fig. 5 ( 9, in part: 
specimens from St. George d’Elmina, Gold Coast, only; the specimens from South Africa 
were typical 7’. ditoeniatus). 
BELGIAN Conco. — Boma, one female. Zambi, one female (Neefs). 
SENEGAL. — Ngalon, one female (M. Thiroux). 
These three females differ rather considerably from the South African speci- 
men of 7’. ditoeniatus mentioned above. They measure 12 to 12.5 mm. in length; 
the palpi are swollen and tapering as usual; the head is relatively longer, being 
more nearly hemispherical; the frons is nearly three times as long as wide and 
visibly narrower at the subcallus than at the vertex; both the basal and median 
ealli are distinct, shiny black, though small; the eyes (without pubescence under 
a high magnification) are, in a dried condition, uniformly dark purple without a 
trace of transverse line; on the dorsum of the abdomen the two lateral gray 
stripes are well marked, but the median one is very faint; the legs are pale 
reddish yellow, the coxae and extreme base of the femora cinereous, the fore 
tarsi and the broad apices of the fore tibiae infuscate; the fore tibiae are de- 
cidedly thicker and the fore tarsi are wider than in the South African specimen; 
the fork of the third longitudinal vein in appendiculate. 
I tentatively suggest that most of the West African specimens that have been 
referred to 7’. ditoeniatus will eventually show somewhat similar differences from 
those of South Africa and that they represent at least a distinct variety. Sur- 
couf (1909, ‘Et. Monogr. Taban. Afrique,’ p. 184) states that he saw the type 
and cotype of 7. bipunctatus at the Brussels Natural History Museum and that 
they did not seem to differ from 7’. ditoeniatus. ‘This, however, tells only half 
of the story; for van der Wulp based his description upon two females from St. 
George d’Elmina, Gold Coast, in the Leyden Museum, and two others from 
South Africa in the Brussels Museum. The latter specimens, I have no doubt, 
were 7’. ditoeniatus as recognized by Surcouf. I venture to suggest that those 
