396 Dr. A. G. Butler—^ Revlsioa 



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 reli- 

 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 T. 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 iu its wet- and dry-season 

 forms. The dry form of T. imperator has the purple apical 

 belt narrower, with less black inner edging, and the uuder- 

 surface colouring is mostly rosy, without transverse bar. 



21. TeracoJus phlegyas. 



Anthocharis phkffyas, Butler, P. Z. S. 1865, p. 431, pi. xxv. figs. 3, 3rt. 

 Euchloe coltcn/enes, Butler, Aun. & Mag. Nat. Hist. ser. 3, vol. xx. 



p. 216, pi. 'iv. figs. 4, 5 (1867). 

 Euchloe jalone, Butler, Cist. Ent. i. p. 14 (1869). 



The types are all from the Wiiite 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, 

 1 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 1 hesitate to insist u])on keeping them separate. 



Teracolus coliagenes, which Mr. Marshall regarded as 

 linking the T. eris and fausta groups, is certainly nothing 

 more nor less than the wet-season female of ty[)ical male 

 T. phlegyas . the female which 1 described is the dry-season 

 type, and therefore is that sex of T. jalone. 



T. phlegyas^ in all its forms, can be distinguished from 

 T. imperator by its somewhat inferior size, the whitish scaling 

 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. The females are much less heavily marked 

 on the upper surface. 



