ENTOMOLOGY 873 
second tergite being barely indicated. I am convinced that Enderlein’s species 
is identical with H. rodhaini, which is known at present from the Belgian and 
French Congo. 
Tabanocella Bigot 
Tabanocella Bigot, 1856, Ann. Soc. Ent. France, (3) IV, pp. 62 and 76. Monotypic for Silovws 
denticornis Wiedemann, 1828. Enderlein, 1922, Mitt. Zool. Mus. Berlin, X, 2, p. 342; 1925, 
loexctt:, XT, 2). 820, 
Rhinomyza Mich. Bequaert, 1928, Rev. Zool. Bot. Afric., XIV, 1, p. 81. Not of Wiedemann. 
Provisionally I am following Enderlein in using the generic name 7’abano- 
cella for the African species thus far included in Rhinomyza. Originally Wiede- 
mann’s Rhinomyza was monotypic, including only R. fusca Wiedemann, of 
Java; the name must therefore be used for any generic group containing that 
species.1 R. fusca has never been properly recognized, but it is very likely 
congeneric with the Oriental species now included in Gastroxides W. W. Saun- 
ders ( = Ditylomyia Bigot), which then will become a synonym of Rhinomyza 
Wiedemann. 
It must be admitted, however, that the character used by Enderlein to 
distinguish between Tabanocella and Rhinomyza is slight. In his table he men- 
tions only the relative length of the first antennal segment (about three times 
as long as thick in Rhinomyza and about twice as long as thick in Tabanocella) 
and gives no additional differences in his generic descriptions. 
Tabanocella now comprises twelve species, five of which occur in Mada- 
gascar, the remainder on the African continent. On account of the complete 
lack of a basal projection to the third antennal segment, Rhinomyza simpli- 
cicornis Austen would seem to belong in Silviws, where I have placed it provi- 
sionally. 
Key To THE Species oF TJ'abanocella OF THE BELGIAN CONGO 
1. Abdomen yellow to brownish yellow, with two dorsal, longitudinal, brownish black bands 
(removed from the extreme sides) on the second tergite. Dorsum of thorax uni- 
formly darkened, without traces of longitudinal bands. Apical spot of wing reaching 
the lower branch of the third longitudinal vein; the infuscate spot at the tip of the 
anal cell connected with the median band of the aia along the hind margin. Fore 
tarsi entirely black. Length, 12 to 13 mm.. .c«, 2. perpulcra, 
Abdomen yellow to brownish yellow, usually with s some e darker spots 0 or - transv erse fasciae, 
which sometimes cover whole segments of the abdomen.....................005- Bi 
2. Median dark band of the wing not reaching the hind margin, not or hardly extending into 
the fifth posterior cell; the distal half of the first basal cell mostly hyaline, except 
for a small apical spot; apical spot of wing faint, not extending beyond the upper 
branch of the third longitudinal vein. Frontal callus narrowly triangular, much 
narrower than the frons at the base and drawn out into a long point. Digitiform 
process of third antennal segment moderately slender. Dorsum of thorax as a rule 
with more or less distinct longitudinal dark stripes..................0cceeeceeoes 3. 
Median dark band almost or quite reaching the hind margin of the wing, always covering 
much of the apex of the fifth posterior cell; the distal half of the first basal cell mostly 
dark, sometimes with a hyaline spot; apical spot of wing strongly marked, covering 
most of the second submarginal cell. Frontal callus more broadly triangular, nearly 
as wide as the frons at the base and ending in a blunt apex. Dorsum of thorax uni- 
1 Curiously enough, R. fusca is not even mentioned by J. H. Schuurmans-Stekhoven in his recent 
revision of the East Indian Tabanidae (1926, Treubia, VI, Supplement). 
