396 Dr. A. G. Butler—A Revision 
to the Transvaal; but the evidence of its occurrence in 
Nyasaland is based solely upon two female examples in the 
Hewitson cabinet, and it is well known that Hewitson attached 
so little value to the habitat of a species, that not much relt- 
ance can be placed upon his labelling. However, there is no 
reason why the distribution of this species should not run 
parallel to that of 7. phlegyas through part of its range. 
That it is the same species, as urged by Mr. Marshall, I do 
not believe, for it differs both in its wet- and dry-season 
forms. The dry form of 7. ¢mperator has the purple apical 
belt narrower, with less black inner edging, and the under- 
surface colouring is mostly rosy, without transverse bar. 
21. Teracolus phlegyas. 
Anthocharis phlegyas, Butler, P. Z. 8, 1865, p. 431, pl. xxv. figs. 38, 3a. 
Euchloe coliagenes, Butler, Ann. & Mag. Nat. Hist. ser. 3, vol. xx. 
p. 216, pl. iv. figs. 4, 5 (1867). 
Euchloe jalone, Butler, Cist. Ent. 1. p. 14 (1869). 
The types are all from the White Nile, and I am not at 
all sure that the larger and more heavily marked types which 
occur considerably further to the south ought not to be kept 
distinct from them; but until they have been bred it will, 
perhaps, be safer to regard them as mere local races of one 
widely distributed species. At the same time it is doubtful 
whether the species occurs all along the line from the White 
Nile to Nyasaland or thence southward to Delagoa Bay; and 
if a name had already been given to the more southern type, 
I should certainly have regarded it worthy of respect. As it 
is, there is so much general resemblance between the wet- 
season male from Nyasa and the dry-season male from the 
White Nile in the pattern and colouring of the upper surface, 
that ] hesitate to insist upon keeping them separate. 
Teracolus coliagenes, which Mr. Marshall regarded as 
linking the 7. erts and fausta groups, is certainly nothing 
more nor less than the wet-season female of typical male 
T. phlegyas; the female which I described is the dry-season 
type, and therefore is that sex of 7’ jalone. 
T. phlegyas, in all its forms, can be distinguished from 
T’. imperator by its somewhat inferior size, the whitish sealing 
in spots upon the apical border of the males, and the trans- 
verse bar on the under surface of the secondaries usually 
more broken up. ‘lhe females are much less heavily marked 
on the upper surface. 
