al 
(Cy iseaiv: " ) 
“‘ Before proceeding further, mention must be made of an 
extensive memoir by Mr. R. Shelford, which appeared in the 
Proceedings of the Zoological Society of London for 1902 
(pp. 230-284, plates xix—xxili), on the subject of ‘Mimetic 
Insects and Spiders from Borneo and Singapore.’ As his 
account in a general way covers certain of the instances 
mentioned here, the following notes may be regarded simply 
as a humble supplement to that memoir. 
I. Miwetric LEPIpoPTERa, 
“1, Moth (Fam. Callidulidae) mimicking a butterfly (Fam. 
Hesperidae). 
“The moth in this case is Callidula abisara, Moore, a common 
day-flying species, which flies low and slowly for short dis- 
tances, frequenting shady jungle paths or half sunlit patches 
in mountain forests. The yellow-chrome underside is un- 
doubtedly procryptic and is not noticeable in flight, though 
when at rest the wings are folded perpendicularly over the 
head and body, and the insect becomes invisible. The upper- 
side, it will be noticed, has a simple pattern consisting of a 
dark tawny-fuscous ground-colour relieved in the fore-wing by 
a conspicuous subapical orange bar. 
“ The Hesperid (Koruthaiolos xanites, Butl.) has exactly the 
same pattern on the upperside, but its underside resembles the 
upper, and possesses the usual dark ground-colour typical of 
this section of Bornean Hesperidae. On one occasion, while 
collecting on Mount Matang (near Kuching), at an altitude of 
2,000 ft., I watched this Hesperid flying slowly along the side 
of the path in front of me, stopping every few yards and then 
fluttering on again, and I was astonished to notice the re- 
semblance in its flight to the moth, an example of which I had 
captured on the path about ten minutes before. 
‘“‘The advantage of this pattern to the moth is at once 
evident, for with its slow flight and a pattern resembling any of 
the swiftly flying Hesperidae the advantage would be nil, but 
given a slow flight and a pattern resembling a slow flying 
Hesperid, then the advantage becomes very real. The instance 
may be classed under the heading of pseudaposematic mimicry, 
