ENTOMOLOGY 937 
Tabanus severini Surcouf 
Tabanus severini Surcouf, 1907, Bull. Mus. Hist. Nat. Paris, XIII, p. 259 ( ¢; between Banana 
and Boma, Belgian Congo); 1909, ‘Et. Monogr. Taban. Afrique,’ pp. 150 and 163, Pl. HI, 
fig. 14 (¢@). 
This species is known from two specimens only, the type and another female 
from the Equator District, Belgian Congo. I have never seen it. In the de- 
scription one reads that the brown abdomen bears a white triangle on the third, 
fourth, and fifth segments; but the figure shows median triangles on the second, 
third, and fourth tergites. Moreover, the species seems to have been described 
from specimens preserved in alcohol. Although Surcouf includes 7’. severint 
in his twelfth group, the species seems to be more closely related to T. gedoelsta 
Sureouf and 7’. coniformis Ricardo. 
Tabanus socialis Walker 
Tabanus socialis Walker, 1850, ‘Insecta Saundersiana,’ I, Dipt., p. 45 (9; “Cape”; according 
to Austen this iadicaion is erroneous, since Walker’s type specimen is labelled ‘Congo’’). 
Austen, 1909, ‘Illustr. African Blood- Suck. hes? p: 100, Pl VIL ne. 67 C9 ). 
Atylotus Iammoleucus Bigot, 1891, Ann. Soc. Ent. France, LX, p. 368 ( 9; ‘Assinie), 
Tabanus leonum Bigot, 1892, Mém. Soc. Zool. France, V, p. 680 ( 2; Sierra Leone). 
Tabanus nigrohirtus Ricardo, 1900, Ann. Mag. Nat. Hist., (7) VI, p. 165 (¢; Bonny, Southern 
Nigeria). 
Atylotus albotomentosus “ Bigot”’ Surcouf, 1909, ‘Et. Monogr. Taban. Afrique,’ p. 132 (as a syno- 
nym of 7’. socialis Walker). 
Liperia. — Banga, two females, October 1926. 
BEeuGiaN Conco. — Banana (J. Rodhain). Boma (A. Koller). Malela, 
in the estuary of the Congo, September 10, 1913. 
Tabanus conformis Walker (1848, ‘List Dipt. Brit. Mus.,’ I, p. 150; 9), 
of which T. fervidus Walker, T. janus Walker, and 7’. terminatus Walker appear 
to be synonyms, was originally described from the Congo. The species has 
never been properly recognized, and it seems doubtful whether it is really 
distinct from 7’. socialis. At any rate, the specimens which I have seen in 
collections under the name of 7. conformis were all T. socialis. 
I have before me a long series of females taken by Dr. J. Rodhain at various 
localities along the Uele River and which seem to represent a small form of 
T. socialis with blackish femora. I doubt, however, whether they are suff- 
ciently different to warrant a distinct name. 
Tabanus testacewentris Macquart (1847, ‘Dipt. Exot.,’ Suppl. II, p. 16; 
9), deseribed from “‘ Africa,” is another doubtful species related to, or identical 
with TY. socialis. Surcouf (1907, Bull. Mus. Hist. Nat. Paris, XITI, p. 212) has 
recorded it from the Belgian Congo, without giving a locality. In his Mono- 
graph (1909, p. 132), however, he states that he does not know the species, 
although he seems to have seen Macquart’s type. Austen’s (1909, p. 101) sug- 
gestion that 7’. testaceiventris is identical with 7. socialis is probably correct. 
T. socialis is a West African species known from the Senegal to Uganda 
and the Lower Congo; it has not been found in the Katanga. Austen (1909) 
has recorded it from Liberia (Monrovia). 
