AUDITORY APPARATUS OF THE MOSQUITO. 591 
but is encircled anteriorly with about forty papille, upon which 
are implanted long and stiff hairs, the proximal sets being about 
0:79 mm. and the distal ones 0-70 mm. in length; and it is beset 
with minute bristles in front of each whorl. 
“The two last joints have each a whorl of about twenty short 
hairs near the base. 
“In the female the joints are nearly equal, number but thirteen, 
and have each a whorl of about a dozen small hairs around the 
- Here, as well as in the male, the parts of the antenne 
enjoy a limited motion upon each other, except the basal joint, 
which, being fixed, moves with the capsule upon which it is im- 
planted. 
“The space between the inner and outer walls of the capsule, 
which we term confidently the auditory capsule,* is filled with a 
fluid of moderate consistency, opalescent and containing minute 
spherical corpuscles, and which probably bears the same relation 
to the nerve as does the lymph in the scale of the cochlea of 
higher animals. The nerve itself, of the antenna, proceeds from 
the first or cerebral ganglion, advances toward the pedicle of the 
capsule in company with the large trachea, which sends its rami- 
fications throughout the entire apparatus, and, penetrating the 
Pedicle, its filaments divide into two portions. The central threads 
continue forward into the antenna, and are lost there; the periph- 
eral ones, on the contrary, radiate outward in every direction, 
enter the capsular space, and are lodged there for more than half 
their length in sulci 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; but 
the palpi, although consisting in both instances of the same 
number of pieces, are very unlike. In the female they are ex- 
tremely short, but in the male attain the length of 2°73 mm. ; 
while the proboscis measures but 216mm. They are curved up- 
‘Ward at the extremity. 
t PPSS The positiop of the capsules strikes us as extremely 
“vorable for the performance of the function which we assign to 
i besides which there present themselves in the same light 
*See fig 92. 
