a/icl Foramina of some Ortliopterous Insects. 155 



the sounds they produce ; but they probably present a similar 

 conformation of the anterior tibia?*. 



It may not, perhaps, be improper in this place to mention a 

 curious apparatus {penkilhis) in the anterior tibia^ of nocturnal 

 Lepidoptera, especially of the Sphingida, though given for a 

 v^ery 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. Vincent, Jan. j, 18'24. 



* On examining several species of Piieionora 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.] 



X 2 VI. De- 



