ENTOMOLOGY 833 
Accounts of its habits in West Africa have been published by R. Boyce (1911, 
Bull. Ent. Res., I, 4, pp. 233-263, 2 maps) and by J. W. S. Macfie (1915, loc. cit., 
VI, pp. 205-229). Descriptions of the larva and pupa based upon West African 
specimens have been given by W. Wesché (1910, Bull. Ent. Res., I, p. 25, figs. 
1-4) and J. W. 8S. Maefie (1917, loc. cit., VII, 3, pp. 297-307; detailed descrip- 
tion of the four distinct larval instars through which this mosquito passes be- 
tween hatching from the egg and pupating; and 1920, loc. cit., X, 2, pp. 161-169; 
detailed description of the chaetotaxy of the pupa). As has been shown by L. H. 
Dunn (1927, loc. cit., XVIII, pp. 138-144), tree-holes are in West Africa an im- 
portant breeding place of A. aegypti. 
In addition to yellow fever, A. aegypti is definitely known to carry dengue 
fever, of which it is the chief, if not the sole vector (Cleland, Bradley, and 
MacDonald, 1916; Siler, Hall, and Hitchens, 1925). 
I fully agree with Dyar and with Martini! that the yellow fever mosquito was 
originally an inhabitant of the Old World tropics, whence it was carried in ships 
to America shortly after the discovery of the New World. The fact that Aédes 
aegypti is nowadays the only American representative of the subgenus Stego- 
myia, which possesses several other allied species in the Old World, is in my 
opinion convincing evidence. 
Among the African Stegomyiae, A. aegypti may be recognized by the follow- 
ing characteristics: Clypeus covered with white scales. Thorax dorsally with 
lyre-shaped, white marks. Abdominal segments dorsally with whitish basal 
bands and lateral spots. Legs: femora with silvery tips and with a narrow white 
line running almost their entire length; hind tarsi with white basal rings on the 
first four segments, those of the first three subequal, the fifth segment all white. 
The markings of the abdomen and legs may vary considerably, as recently 
shown by Mrs. Sophia L. M. Summers Connal (1927, Bull. Ent. Res., X VIII, 
pp. 5-11, Pi. J). 
Aédes (Stegomyia) africanus (Theobald) 
Stegomyia africana Theobald, 1901, ‘Monogr. Culic.’, I, p. 304, fig. 93, Pl. XIV, fig. 54 ( 9 #; Sierra 
Leone; Mashonaland; Lagos; Old Calabar; Zomba, Nyasaland). Wesché, 1910, Bull. 
Ent. Res., I, p. 27, Pl. III, figs. 3-11 (larva and pupa). Newstead, 1911, loc. cit., I, 4, p. 241. 
Edward, 1912, loc. cit., III, p. 10. 
Stegomyia dubia Theobald, 1910, ‘Monogr. Culic.,’ V, p. 170, fig. 62 ( 9; Katemas, Bihé, Angola). 
Liperta. — Kaka Town, August 20, 1926, biting man along a trail in a forest 
clearing, at 4.30 P.M. 
This species differs from the yellow fever mosquito in having the abdomen 
unbanded, while the thorax bears dorsally two short, glittering, metallic lines 
over the anterior part. On the hind tarsi the last segment is dark, and the white 
basal ring of the third segment is much longer and more conspicuous than that 
of the other segments. 
1 Martini, E. 1929. ‘Tiergeographische Gesichtspunkte zur Beurteilung der Geschichte und Epi- 
demiologie des gelben Fiebers.’ Verh. Deutsch. Ges. Angew. Ent., 7. Mitgliedervers. Miinchen, 31. 
Mai-2. Juni 1928, pp. 76-81. 
