(| xeviii_ ) 
with great interest; it was obviously something which it 
would be better to examine first. The monkey was a young 
one who had been in captivity from babyhood, so that it was 
highly probable that he had never seen anything like this 
before. While he held the grasshopper (which was of good 
size, being two inches long), it began to emit yellow, 
strongly smelling, acrid froth from the sides of the thorax, 
forcing it out by first distending the abdomen with air so as 
to show off the red markings on the sides, and then con- 
tracting the abdomen so strongly that the bubbles emerged 
from the thorax with a hissing sound audible several yards 
away. At the same time the red wings were prominently 
displayed. 
The monkey was obviously very greatly interested in this 
very curious phenomenon, and tasted the froth. He clearly 
did not like it, but, as he could not believe that an insect given 
him by his master was not good to eat, he persisted in pulling 
it to pieces and tasting: eventually the dismembered insect 
lay on the ground. It was hardly possible to doubt from the 
monkey’s behaviour that this conspicuous insect was highly 
distasteful, and that if he had been a wild monkey, able to 
¥select what food he would eat from out of a great abundance 
and had already met one of these markedly aposematic grass- 
hoppers, he would not think it worth while to try another. 
The other two monkeys tasted and smelt at the remains, but 
would not eat them. 
I now quote two examples of Procrypsis. The first was a 
species of Curphis, a Noctuid allied to our English Leucama, 
which adopted an unusual attitude when at rest. It was 
found at Jinja, in 1910, amongst tall dry grass. On the upper 
side the wings are light brown; below, however, they are of 
a beautiful light silvery grey. The meaning of this is at once 
obvious when the moth is seen in its natural environment, 
where it adopts an attitude quite foreign to that of the majority 
of Noctuids. It hangs from a dry flower-spike of tall grass, 
with the wings brought together face to face over its back so 
that they hang down showing only the silvery underside, and 
the effect agrees extraordinarily well with the silvery grass- 
head. I repeatedly saw it take up this attitude when it had 
