90 The Larva of Collyris emarginatus. 
of its burrow with its prey. It is necessary that the head 
of the larva should always fit more or less accurately the 
entrance to its burrow, but the same necessity does not 
arise in the case of the Collyris larva, for here the burrow 
is a hiding-place or lair from whence the animal emerges 
to capture its prey; so long as the entrance to its lair is 
not too small it cannot particularly matter what size it is. 
