ENTOMOLOGY 8795 
Tabanocella umbraticola (Austen) 
Rhinomyza umbraticola Austen, 1911, Bull. Ent. Res., I, p. 289, fig. 4 ( ¢; High plateau south of 
Lake Tanganyika, Northeastern Rhodesia). 
This species is known only from Northeastern Rhodesia and the Katanga 
District of the Belgian Congo. I have before me one of the paratypes collected 
by 8. A. Neave in the mid-Lualaba Valley, at an altitude of 3000 ft., and iden- 
tified by Austen. It is extremely close to 7’. innotata from which it differs in 
lacking the brownish black spot in the lower part of the face, in the dorsum 
of the thorax at most faintly striped, and in the first two abdominal tergites 
not being pale yellowish with narrow dark brownish hind margins; instead 
the first tergite is entirely pale dirty yellowish, while the second is dirty yel- 
lowish with an irregular dark brown median triangle not reaching the hind 
margin and narrowly connected with dark brown lateral spots. The frons is 
like that of 7. innotata, if anything a little more narrowed toward the vertex; 
antennae are lacking. Whether 7. uwmbraticola and T. innotata are specifically 
distinct remains somewhat doubtful. 
Tabanocella innotata (Karsch) 
Silvius innotatus Karsch, 1888, Berlin. Ent. Zeitschr., XX XI, 2, (1887), p. 372, Pl. IV, fig. 6( 9; 
Usambara, Tanganyika Territory). 
Rhinomyza innotata 8. A. Neave, 1912, Bull. Ent. Res., III, pp. 285, 313, 315, and 317 (¢). 
Rhinomyza bifasciata Grinberg, 1913, Entom. Rundschau, XXX, p.99( 9; Amani, Tanganyika 
Territory). 
BELGIAN Conao. — Panda River, one female, taken in the forest gallery, 
September 1920 (Mich. Bequaert). 
This specimen agrees in every respect with Karsch’s and Griinberg’s de- 
scriptions. Grinberg evidently overlooked Karsch’s S. innotatus; his R. bifas- 
ciata came from the same region as Karsch’s species, Amani being situated in 
the Usambara District. 
T. innotata is an East African species known from Tanganyika Territory, 
Nyasaland, Northern Rhodesia and the Katanga. 
T. concinna (Austen) (= Rhinomyza concinna Austen, 1910, Ann. Mag. 
Nat. Hist., (8) VI, p. 352; 9; West Nyasa, Nyasaland), of which I have 
before me a female from the Kafue River, Northern Rhodesia (October 22, 1923. 
— Mich. Bequaert), is extremely close to 7’. innotata. It seems, however, to 
be a valid species. As pointed out by Grinberg, in 7’. concinna the basal divi- 
sion of the third antennal segment is more slender so that the digitiform process 
does not quite extend to the base of the second division (in 7’. innotata it 
extends well beyond the base of the second division). In addition, the frons is 
decidedly wider and scarcely narrowed toward the vertex (about three and 
one-half times as long as wide at the vertex in 7’. concinna; about four times, 
in 7’. innotata) and the frontal callus has a somewhat different shape. 
The specimen of 7’. concinna from the Kafue River bears a collector’s note 
that it was taken in the forest gallery and was flying at dusk. This is inter- 
esting in view of Neave’s observation that two specimens of 7. innotata were 
