230 MR. R. SHELFORD ON MIMETIC INSECTS AND [ Nov. 4, 
[From the PROCEEDINGS OF THE ZOOLOGICAL Sociery OF Lonpon, 
November 4, 1902. | 
Observations on some Mimetic Insects and Spiders from 
Borneo and Singapore. By R. Suetrorp, M.A., 
C.M.Z.S., Curator of the Sarawak Museum. With 
Appendices containing Descriptions of new Species 
by R. Suetvrorp, Dr. Karn Jorpan, C. J. GAnan, the 
Rev. H. 8S. Goraam, and Dr. A. SENNA. 
(Plates XIX.-X XIII.) 
The theory of mimicry having originated and having been 
further elaborated chie fly from a study of South American 
insects, it is but natural that these should figure largely in all 
works relating to the subject. This paper, a brief abstract of 
which, arranged by Professor Poulton, appeared in the British 
Association Reports, 1900, p. 795, is an attempt to bring into 
greater notice the richness of the Malayan sub-region in similar 
mimetic species—nearly all the ex: vmples here described and dis- 
cussed having been captured within the last four years in a 
circumscribed area of 10 mile radius, with Kuching, the capital 
of Sarawak, as its centre. A recent collecting-trip of three 
weeks’ duration to Mt. Penrissen (about 50 miles inland) was 
productive of several new examples; and I feel convinced that a 
‘similar reward awaits the collector on other mountains of the 
island and on those of Sumatra, Celebes, and other numerous 
islands of the great Archipelago, many of which are still virgin 
ground to the entomologi st. 
In order to summarize as much as possible our knowledge of 
the mimetic insects of Borneo, I have drawn up tables of the 
mimetic Longicorn Beetles and of the Lepidoptera; the latter is 
a modification of a somewhat similar list given by Haase in his 
‘Researches on Mimicry’ (English translation), Stuttgart, 1896, 
but I have found it necessary to question certain conclusions and 
to make a few additions. 
1 For explanation of the Plates, see page 281. 
