XV. Pseudacrea poggei and Limnas chrysippus; the 
numerical proportion of mimic to model. By 
Horace A. Byatt, B.A. FES. With a note by 
Professor E. B: Poutron, D.Sc., M.A., F.R.S., ete. 
[Read April 5th, 1905.] 
PLATE XIV. 
THESE butterflies were found among a collection of some 
1200 specimens given to me by Pere Guillemé of the 
White Fathers’ Mission to Central Africa, under whose 
direction they were collected at his station at Kayambi, 
in Awemba country, N.E. Rhodesia, near the sources of 
the Congo, locally called the Chambezi, between October 
1898 and January 1899. 
His system was to send out a number of native school- 
boys—his “ gamins,” as he called them—each armed with 
a net and a book, and orders to capture anything and 
everything that came in their way, placing their captures 
between the leaves of the book for safe carrying home. 
He particularly mentions that he told his boys to take 
“des spécimens aussi variés que possible ;” and that they 
would do this literally I know from my own experience of 
natives, for I have found them generally unable to dis- 
criminate between species, and when sent out by me on 
similar occasions they have returned with large numbers 
of the insect most in evidence at the moment, and a pro- 
portionally smaller number of others. It is, therefore, 
allowable to suppose that the whole lot which came into 
my possession gives a very fair idea indeed of the numerical 
strength of the several species found in the locality. 
On opening the papers and examining the specimens— 
which have suffered a good deal from the damp and 
neglect of seven years—it was found that roughly one- 
third of the whole collection consisted of Zimnas chrysippus, 
L.,, and its mimics; and among these latter were seventeen 
specimens of Pseudacrea poggei, Dewitz,—many of them 
in a fair state of preservation, though, with the rest, they 
show signs of being unduly pressed between the pages of 
the book, and are somewhat dulled in colour by damp. 
TRANS. ENT. SOC. LOND. 1905.—PART II. (JULY) 
