Papilio cenca and Hyiwlimnas misi'ppus. 687 



he thinks, mimetic of Euralia nmhlbergi. This Mr. Leigh 

 describes as rarest of all the forms of ccnea. It has 

 been ah-eady pointed out that in certain respects the 

 hi2')j)ocoonoides form of cenea, and the hip'pocoon form of the 

 Western mcropc respectively, resemble their Nymphaline 

 co-mimics Enralia wcMhcrgi and E. antlicdon far more 

 closely than the primary models Amauris doviinicanus 

 and A. niavius (Trans. Ent. Soc. Lond., 1902, p. 48C, 

 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 cenea 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 



Hippocoonoides .... 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 trophonms 

 during four months of almost daily collecting ; I have 

 received at long intervals 3 examples from there — 1 

 taken in copidd. 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 

 % F. cenea, in say 100 specimens. I can ordy make a 

 ROUGH GUESS as follows : — 



