of the Genus Teracolus, Swans. 465 
extreme wet-season form, is usually distinctly larger than the 
wet-season form of J’. evenina, and always has all the dark 
markings much heavier, the black marginal spots of the 
secondaries being connected by grey scaling into a continuous 
or partly confluent border and frequently preceded by a lunu- 
lated greyish submarginal stripe. Even Mr. Trimen, who 
states that the two species are inseparable, is constrained to 
admit that 7’. sipylus is “somewhat more heavily marked.” 
1’. callidia chiefly differs from the latter in having the second- 
aries below ‘ brownish-white,’” and is probably an inter- 
mediate phase between the wet- and dry-season forms; the 
dry-season form is 7’. casta, which is far more lightly marked 
than any South-African example of 7. evenina. It is true 
that in Gerstaecker’s figure and in our single example the 
male has a white under surface; but this is often the case 
with individuals of the dry-season phase in other species of 
the genus, as, for instance, in those examples of 7’. dedecora 
(the dry-season form of 7’. ewpompe) to which Felder gave the 
name of 1’. theopompe. 
Did intergrades between 7. eventna and T’. casta exist, one 
would be bound to regard them as one species; but the sup- 
posed intergrades prove to be nothing of the kind when 
examined with a view to seasonal variation, and the two 
species remain as representative localized forms. 
56. Teracolus Cartert. 
Teracolus Cartert, Butler, Ent. Month. Mag. xviii. p. 227 (1882), 
Teracolus laura, K. M. Sharpe, Ann. & Mag, Nat. Hist. ser. 6, vol. v. 
p. 441 (1890). 
Ranges along the West Coast of Africa from Senegambia to 
Accra, and thence across the continent eastwards to the 
Albert Nyanza. 
Of this species I have only seen wet and intermediate 
phases. Ifa dry-season form occurs it should be looked for 
in Central Africa. Both types of the species belong to the 
wet-season form, 
This may be regarded as a heavily marked development of 
the more widely distributed 7. ¢saura, like which species it 
has the basal suffusion softly diffused, instead of almost 
uniform in tone with the blackish internal spot on the 
primaries. ‘The wet-season form, however, is much larger 
than J’. ¢sawra, much more heavily bordered with black in 
both sexes, and with a black inner edging to the apical orange 
patch in the male. The intermediate form is as heavily 
bordered as the wet phase of 7. tsaura, whilst both wet and 
intermediate forms have the wings on the under surface 
