of the Genus Teracolus, Swans. 505 
93. Teracolus mutans. 
Teracolus vesta, Trimen (not Reiche), South Afr. Butt. vol. iii. p. 160 
(1889). 
Teracolus mutans, Butler, Ann. & Mag. Nat. Hist. ser. 4, vol. xix. 
p. 459 (1877). 
Teracolus argillaceus, Butler, ibid. (and T. vesta, Staudinger, Exot. 
Schmett. i. pl. xxiii., 1884). 
Ranges from Nyasa southwards to Natal, occurring on the 
Zambesi, in the Transvaal, and at Delagoa Bay. 
After examining twenty-nine examples of this species, 
including some interesting varieties recently collected by 
Mr. Guy A. K. Marshall, Iam unable to follow that gentleman 
in his decision as to the identity of the southern insect with 
the Abyssinian 7’ vesta; the latter, judging from the descrip- 
tions and the original illustration, is slightly larger and differs 
in the salmon-buff of the upper surface extending in the cell 
of primaries right up to the almost black basal suffusion, in 
the even heavier- black border of the secondaries and the 
yellow suffusion on the interno-median area, in the less 
irregular and uniformly redder bands on the under surface 
of the secondaries, the inner and submarginal bands being 
also broadly and sharply defined. Most examples of 7. mutans 
show very little blackish suffusion at the base of the wings on 
the upper surface; but Mr. Marshall, who seems to be one of 
the most energetic and indefatigable of collectors, has sent us 
several unusually heavily shaded examples, in which the basal 
suffusion is deep bluish ash-coloured, but far from approaching 
the grey-blackish tint of typical 7’. vesta. ‘The more southern 
examples of 7’. mutans are considerably smaller than the 
Abyssinian species, but the Nyasa examples sometimes run 
it very close in expanse of wings. 
T. argillaceus is the dry-season form of the species, and 
we have some very pretty intermediate examples from 
Delagoa Bay and Nyasa. 
94. Teracolus vesta. 
Idmais vesta, Reiche, in Ferr, Gal. Voy. Abyss., Ent. p. 463, pl. xxxi. 
figs. 7, 8 (1849). 
Idmais velleda, Lucas, Rey. et Mag. de Zool. 1852, p. 428. 
Abyssinia. 
Both descriptions and the illustration of this species are 
taken from the wet-season form. Reiche’s figures apparently 
represent a female. Itis probable that the male will prove to 
be less black at the base of the wings above. 
Ann. & Mag. N. Hist. Sex. 6. Vol. xx. 34 
