Papilio cenea and Hypolimnas misippus. 687 
he thinks, mimetic of Huralia wahlbergi. This Mr. Leigh 
describes as rarest of all the forms of cenca. It has 
been already pointed out that in certain respects the 
hippocoonoides form of cenca, and the hippocoon form of the 
Western merope respectively, resemble their Nymphaline 
co-mimics Huralia wahlbergi and LL. anthedon far more 
closely than the primary models Amauris dominicanus 
and A. niavius (Trans. Ent. Soc. Lond., 1902, p. 486, 
footnote). The existence of this chalky-white form indicates 
an interesting approach towards the co-mimic in another 
character. 
Mr. Guy A. K. Marshall, in sending an estimate of the 
proportionate occurrence of the three chief forms of the 
female cenca in Natal, warns me that he is only giving a 
very general impression based on a limited and now long- 
past experience. His estimate is.as follows :— 
Cenea 10 
FHippocoonoides 4 
Trophonius 1 
15 
Mr. Roland Trimen, F.R.S., wrote as follows :— 
“ November 23, 1903. 
“At Knysna (where I was out in the district almost 
every day for about eight months) I saw only 2 trophonius, 
both of which I captured. In Natal, I saw no trophonius 
during four months of almost daily collecting; I have 
received at long intervals 3 examples from there—1 
taken in copula. I also received from Plettenberg Bay 
(Knysna District) 3 examples, 1 from East London, and 
1 (a variety with fulvous instead of white sub-apical bar 
to fore-wing) from Bathurst;—all in Cape Colony. 
Hippocoonoides I never saw in the Knysna District, but 
have received 2; in Natal I saw and took 2 only, but have 
received 4 from there. Cenea, on the contrary, under one 
or other of its two forms was pretty frequent, but not 
nearly so much so as the male—owing to less active habits, 
no doubt.” 
“ December 28, 1903. 
“As regards the proportionate numbers of the forms of 
¢ P.cenea, in say 100 specimens. I can only make a 
ROUGH GUESS as follows :— 
