470 Prof. &, Poulton on the 
increasing darkness, the nigrescens forms, without the 
orange, are less dark than the majority of nigro-lutescens. 
The most extreme example of the latter (No. 8, p. 471) 
appears as an almost uniformly blackish butterfly with a 
faint yellow tinge in the region of the median band and 
one still fainter, indeed evanescent, in the more distal 
areas.* 
C. Nigrescens, 9 f. n. 
In this form the dark pigment invades the white 
median band to a variable extent, in pronounced exam- 
ples nearly obliterating it, in others replacing it by grey. 
In many specimens this invasion is strong in F.W., slight 
in H.W. As already stated, the pigment is less dark in 
this form than in nigro-lutescens, and the distal edge of 
the basal area and the spots of the curved and lunulate 
lines are more distinct than in any other form except 
theobene and the palest lutescens. 
The under surface of the three forms usually differs but 
little from that of theobene. There is commonly an 
emphasis of the dark pigment, pronounced in the extreme 
forms, especially along the shadow-like outer border of 
the midrib-like stripe. 
Lamborn’s captured specimens, together with Farqu- 
harson’s two bred varieties (p. 403), are arranged below, 
each set of forms in the order of increasing darkness. 
* Tt is interesting to note that parallel female forms are found in 
the allied 8. African C. alcimeda Godt., as recognised by Trimen in 
‘South African Butterflies,’ 1887, i, p. 314. In a series of 4 3, 
9 2 captured by the Rev. K. St. A. Rogers at Eland’s Kop (about 
5000 ft.), about 30 miles S.W. of Pieter Maritzburg, March 12=21, 
1919, 6 2 have the median band of the creamy colour described by 
Trimen on p. 313 (where the sign 9 is accidentally replaced by 3). 
The tint is deeper in F.W., and in one example may be described 
as pale yellow—as also in a Q from Llabisa, E. Centr. Zululand. 
In the remaining three Eland’s Kop 9 the yellow tint is greatly 
deepened in both wings, being pale ochreous in one, deep 
ochreous in the second, and nearly obliterated by fuscous in the 
third. There is a less strong fuscous invasion of the band in the 
two former, and all three may be considered forms of nigro- 
fulvescens, the third being very near nigrescens. The Eland’s Kop 
examples are small, the females varying from 52 to 56 mm. in 
expanse, the males from 46 to 52.—E. B. P. 
