A. M. Mayer—Researches in Acoustics. 101 
and his head furnished with antenne and palpi in a state of 
greater development. (Fig. 2.) Notwithstanding the fitness of 
his organs for predatory purposes, he is timid, seldom enterin 
dwellings or annoying man, but restricts himself to damp an 
foul places, especially sinks and privies. The female, on the 
other hand, gives greater extension to her flight, and eee 
our race, is the occasion of no inconsiderable disturbance an 
— during the summer and autumn months. 
‘ 
the female. 
“Tn the male, the antenna is about 1°75 mm. in length, and 
consists of fourteen joints, twelve short and nearly equal, and 
two long and equal terminal ones, the latter measurin 
(together) 0°70 mm. Each of the shorter joints has a fenestra 
skeleton with an external investment, and terminates simply 
posteriorly, but is encircled anteriorly with about forty papulle, 
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 whor 
“The two last joints have each a whorl of about twenty 
short hairs near the base. 
“Tn the female the joints are nearly equal, number but 
thirteen, and have each a whorl of about a dozen small hairs 
around the base. 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 implanted. 
“Th between the inner and outer walls of the i gor 
i with 
* See fig. 2, 
