Auditory Apparatus of the Culex mosquito. 561 
hypothesis that the antennal fibrils are the auditory organs of 
the mosquito, I cannot do better than quote the following from 
Dr. Johnston’s paper :-— 
“ While bearing in mind the difference between feeling a noise 
and perceiving a vibration, we may safely assume with Carus— 
for a great number of insects at least—that whenever true audi- 
tory organs are developed in them, their seat is to be found in 
the neighbourhood of the antenne. That these parts themselves 
are in some instances concerned in collecting and transmitting 
sonorous vibrations, we hold as established by the observations 
we have made, particularly upon the Culex mosquito; while we 
believe, as Newport has asserted in general terms, that they serve 
also as tactile organs. 
“The male mosquito differs considerably, as is well known, 
from the female, his body being smaller and of a darker colour, 
and his head fancied with antenne and palpi in a state of 
greater development (see figure). Notwithstanding the fitness 
of his organs for predatory purposes, he is timid, seldom entering 
dwellings or annoying man, but restricts Paneele to damp ney 
foul places, especially ae and privies. The female, on the 
other hand, gives greater extension to her flight, and, attacking 
our race, is the occasion of no inconsider able disturbance ie 
vexation during the summer and autumn months. 
“The head of the male mosquito, about 0°67 millim. wide, is 
