ENTOMOLOGY 887 
Corizoneura Rondani, 1863, Archiv. Zool. Anat. Fisiol. Canestrini, III, p. 85. Type by designa- 
tion of Coquillett (1910): Pangonia appendiculata Macquart, 1838 = Tabanus aethiopicus 
Thunberg, 1789. Austen, 1920, Bull. Ent. Res., XI, p. 139. Not Corizoneura Enderlein, 1922. 
Couzoneura D. Sharp, 1916, ‘Zool. Record for 1914,’ Insecta, p. 282. Misspelling of Corizoneura. 
Siridorhina Enderlein, 1922, Mitt. Zool. Mus. Berlin, X, 3, p. 336; 1925, loc. cit., XI, 2, p. 265. 
Type by original designation: Pangonia longirostris Hardwicke, 1823. 
If one accepts Coquillett’s selections of genotypes as valid, Siridorhina is a 
plain synonym of Nuceria. Moreover, the genotype of Corizoneura is evidently 
congeneric with that of Nuceria. The genus, as here accepted, has been correctly 
defined by Austen (1920). 
Nuceria contains a fairly large number of species in the Ethiopian and 
Oriental Regions. Five species have thus far been found in the Belgian Congo, 
separated as shown in the subjoined key: 
1. Female: Abdomen bicolored, the two basal segments pale straw-colored, the remainder 
chestnut-brown with black pilosity; no pale fringes of hair on the tergites. Legs en- 
tirely russet yellow. Dorsum of thorax thickly covered with short, bright yellow 
hairs, the pollinosity forming faint longitudinal stripes; pleura and sternum with 
black pile. Length, 18 to 20.5 mm.; of proboscis, 18 to 24 mm. Male unknown. 
OR 0) SN ee Oe Rt hi hey ACO h ted EE Aine eles ae N. mayombensis. 
Abdomen not bicolored as indicated above, either uniformly russet or with black mark- 
ings; often with fringes of pale hair at the apices of some of the tergites.......... 
2. Female: abdomen russet dorsally and ventrally, without dark markings; dorsum of 
thorax sepia-colored, unstriped, with a ridge of longer yellow hair above the base of 
the wing; legs cinnamon-rufous. Male: abdomen russet; the fifth and sixth 
tergites brownish black; the first to fourth often with a median, anterior, small, 
brownish black spot; fore tarsi with processes at tips of first and second segments 
projecting beyond the end of the following segment. Length, 17 to 18mm. JN. inornata. 
Abdomen conspicuously marked with black in both sexes. The black markings in the 
male more extensive, or the dorsum of the thorax is conspicuously striped, or the 
legs are not entirely rufous, or the fore tarsi have much shorter or no processes... 2. 
2. Both sexes: dorsum of thorax yellow pollinose, with three conspicuous black-brown longi- 
tudinal stripes; abdomen ochre-yellow, with a row of median, dorsal, black spots; the 
fifth and sixth segments almost wholly black in the male; legs ochraceous-rufous; 
a tuft of black hair before the base of the wings. Length, 17 to 20 mm.......N. virgata. 
Dorsum of thorax without conspicuous longitudinal stripes..................05+.005- 3. 
3. Female and male colored much alike; dusky, with the two basal segments of abdomen 
conspicuously paler, ochraceous, especially on the ventral side; the second tergite in 
the male with a median, brown blotch; second and fourth tergites with a fringe of 
silvery-white hair on the hind margin, fore and middle legs russet-brown, their tibiae 
and tarsi somewhat paler; hind legs blackish brown; first and second segments of 
fore tarsi in the male with moderate processes which do not reach the distal end of 
the following segment. Length, 16 to 18.5 mm.................2000 0 N. schwetzt. 
Female and male conspicuously different in color, the venter not bicolored. Male: ab- 
domen tawny, with a black, median spot on tergites one to four, the remainder 
mostly black; thorax sepia-colored with narrow, blackish, longitudinal streaks. 
Female: dorsum of thorax and first abdominal segment clay-brown, the thorax with 
a brighter, median, longitudinal stripe; second and following segments clove-brown, 
clothed on the hind margins with short, whitish hair; legs clove-brown. Male with- 
out processes at the tips of the fore tarsal segments. Length, 18 to 19 mm. N. neavet. 
to 
Nuceria mayombensis J. Bequaert 
Nuceria mayombensis J. Bequaert, 1924, Rev. Zool. Afric., XII, 4, p. 464 (¢@; Ganda Sundi, 
Belgian Congo). 
Siridorhina ziemanni Enderlein, 1925, Mitt. Zool. Mus. Berlin, XI, 2, p. 266 ( @; Johann Albrecht- 
shohe and Lolodorf, Cameroon; Nkolentangan, Spanish Guinea). 
