and Foramina of some Orthopterous Insects. 155 
the sounds they produce; but they probably present a similar 
conformation of the anterior tibiæ *. 
It may not, perhaps, be improper in this place to mention a 
curious apparatus (penicillus) in the anterior tibiæ of nocturnal 
Lepidoptera, especially of the Sphingide, though given for a 
very different purpose. It varies much in shape and size, but 
is generally an elongate velvet pad, and is used to brush and 
clean the large eyes of the animals of this order. 
St. SERE Jan. 5, 1824. 
* On examining several species of Pneumora in the Society's collection, the foramina 
alluded to by Mr. Guilding cannot be detected. In this genus the organ of sound is not 
situated at the base of the elytra, but on the sides of the abdomen, as pointed out in 
the 3rd edition of the Introduction to Entomology.—[Note by the Secretary.) 
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