102 A. M. Mayer — Researches in Acoustics. 
the pedicle of the capsule in company with the large trachea, 
which sends its ramifications throughout the entire apparatus, 
and, penetrating the pedicle, its filaments divide into two por- 
tions. The central threads continue forward into the antenna, 
and are lost there; the peripheral ones, on the contrary, radiate 
outward in every direction, enter the capsular space, and are 
lodged there for more than half their length in sule? wrought 
in the inner wall or cup of the capsule. 
‘In the female the disposition of parts is observed to be 
nearly the same, excepting that the capsule is smaller, and that 
the last distal antennal joint is rudimental. 
“The proboscis does not differ materially in the two sexes; 
according to their lengths; and of the direction in which the 
undulations travel, by the manner in which they strike upon 
the antennz, or may be made to meet either antenna in conse- 
quence of an opposite movement of that part. 
“That the male should be endowed with superior acuteness 
of the sense of hearing, appears from the fact, that he must seek 
the female for sexual union either in the dim twilight orin the 
dark night, when nothing but her sharp humming noise can 
serve him as a guide. The necessity for an equal perfection of 
hearing does not exist in the female; and, accordingly, we find 
that the organs of the one attain a development which the 
others never reach. In these views we believe ourselves to be 
borne out by direct experiment, in connection with which we 
may allude to the greater difficulty of catching the male 
mosquito. 
etn the course of our observations we have arrived at the 
conclusion, that the antennz serve to a considerable extent as 
organs of touch in the female; for the palpi are extremely 
short, while the antenne are very moveable, and nearly equ 
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