7 
6. Specimens arranged for Display in the Upper 
South Corridor. 
The excessive amount of labour required by collections 
had, previous to 1906, prevented the devotion of any attention 
or time to the preparation of specimens for exhibition in the 
corridor outside the Hope Department. During the past 
year, however, two fine sets of South American butterflies 
have been arranged against the south wall by Mr. J. Collins. 
One of these groups represents the whole and the other nearly 
the whole of a single day’s captures made upon the road from 
the Potaro River to the gold mines. The dominant species 
and types of colouring in that part of British Guiana are thus 
very clearly displayed, together with the remarkable series of 
variations in the most abundant species—J/elinaea muneme— 
variations which effect the most gradual and perfect transition 
from a barred to a black hind wing. The remarkable 
prominence in the butterfly fauna of species entering into 
mimetic associations is also brought forward very conspicu- 
ously in the exhibit. Printed labels giving the names of the 
species have not yet been prepared, but in other respects the 
two groups are complete. 
7. The Material illustrated in Published Plates. 
During the past year, the material of several published 
plates on subjects of general biological interest, especially 
mimicry, has been arranged in a permanent form, and a copy 
of the corresponding plate placed beside each group. Thus 
naturalists will have the opportunity of easily studying the 
material, described and illustrated by memoirs which have 
been produced in association with the Hope Department. 
A. beginning has been made with the plates accompanying 
Mr. R. Shelford’s paper, Odservations on some Mimetic Insects 
and Spiders from Borneo and Singapore (Proc. Zool. Soc. 
Lond; 1902, ps 230); Mr..S. A. Neave's: paper on” Some 
bionomic notes on butterflies from the Victoria Nyanza (Trans. 
Ent. Soc. Lond., 1906, p. 207); and the Professor's paper, 
Mimetic forms of Papilio dardanus (merope) and Acraea john- 
