20 
PSYCHE 
[p'fcbruai y 
dible seems to be rather soft as, although no suture can be seen, the projection is 
capable of a slight Hexion and extension. The projection works in the trough 
formed by the angle of the head. Instead of the usual minute spines at this point 
there are about twenty-five long, slender spines placed in a group with their bases 
well separated. They are apparently somewhat movable. The function is diffi- 
cult to imagine. 
The adult is distinguished from all others by the unusually long antennae 
in both sexes; according to Mr. Coquillett, the second antennal joint is over four- 
teen times as long as wide, whereas in other forms of culicidae it is less than 
eight times as long as wide. 
It will be noted in the forgoing comparative study that I’sorophora falls into 
the same category with iMegcu/iimis, to which it is much more nearly related both 
in anatomy and habits than to Cuh’x, in the same sub-family with which it is at 
