266 MR. R. SHELFORD ON MIMETIC INSECTS AND [ Nov. 4, 
represent very closely the whorls of a spirally coiled snail-shell, 
such as [elix. 
The spider occurs in Kuching, and is generally found resting on 
leaves, sometimes with the cephalothorax turned right under the 
abdomen, in which position it is readily mistaken for a snail- 
shell, or with the cephalothorax in the normal position, In the 
latter case, if disturbed, this part of the body is immediately 
doubled under the abdomen and the animal usually rolls off the 
leaf, especially if a small one, and becomes lost in the decaying 
vegetation carpeting the ground below. I have been unable to 
discover any web, nor have I seen the manner in which the 
animal hunts or seizes its prey, but it seems probable that this 
is an example of one of those doubly significant devices whereby 
an animal is enabled not only to avoid its foes (in this case pre- 
datory wasps) but also to approach its own prey unobserved. 
[It is possible that this resemblance is cryptic ‘ather than 
mimetic. The former interpretation seems to be valid in the 
case of the British larva Aspilates gilvaria, which also resembles : 
snail-shell.—E. B. P.] 
ii. Mimic. Amyciea lineatipes (Pickard-Cambridge). 
Model. (cophylla smaragdina (Fab.). 
T am indebted to Mr. H. N. Ridley for leave to incorporate in 
this paper the observations which he has made on this mimetic 
species, which as yet I have failed to find in Borneo, The ant 
under notice is an extremely common and ferocious species, 
chiefly remarkable for its nest-building habits. Mr. Ridley has 
described these habits in the Journal of the Asiatic Society, 
Straits Branch, 1890, No. 22, p. 345. The spider is of the same 
colour as the ant (reddish brown), and bears on the posterior part 
of the rather acutely pointed abdomen a pair of black eye-like 
spots, so that it is the abdomen of the spider which corresponds 
to the head, the cephalothorax to the abdomen of the ant. Both 
mimic and model are found together near the nest of the latter, 
and so close is the resemblance between the two that the spider 
is able to prey with impunity on the ants: I have taken a speci- 
men of a spider with the body of an ant sucked nearly dry im 
its jaws; and Mr. Ridley has seen an individual pounce on an ant 
and then dropping from its foot-hold on a leaf, hang suspended 
by a silk thread in order to complete its meal in safety. 
No web is spun by the spider, but a round disc of silk, probably 
the egg-cocoon of this species, was found on the under surface 
of a leaf much frequented by the spider and its models. 
ili. Mimic. Salticus attenwatus (Pickard-Cambridge). 
Model. An Ant. 
Mr. Ridley also sent me from Singapore a remarkable little 
Attid with a well-marked constriction about the middle of the 
