Vol. IX, No. 10.] The Limestone Caves of Burma. 42] 
[N.S] 
furtive existence in the open that the sensory peculiarities of 
the Tarantulidae and the Stenopelmatinae have probabl 
originated. 
Nevertheless, a cavernicolous life is not in all respects 
e 
frequent it by day (especially the bats) bring in with them 
from outside an abundant food-supply for animals that can 
in 
case for the predator to possess organs of perception, in order 
that it may detect the presence of vigilant prey ; in the other 
for the prey to possess similar organs whereby it may be 
form legs of the Arachnid and the antennae of the insect are 
even longer and more delicate than is usually the case in their 
respective families. 
As a general rule, among the groups represented in the 
Burmo-Malayan cave-fauna, colouration is more readily 
the moth Crypsithyris spelaea and the myriapod Cambalamor- 
pha feae) it is probable that feebleness of pigmentation has 
