Production of Sound in a S.A. Locustid 69 



protectors to the underlying wings; the teeth-bearing area is a 

 specially modified vein on the left tegmen; there are apparently 

 no teeth on the right tegmen. 



The stridulating apparatus in Orihoptera is usually taken to be 

 a secondary sexual character, and is interpreted as being a means 

 of attracting the female, or of exciting her sexually. 



I am indebted to Dr. Peringuey of the South African Museum 

 for confirmation of the identity of the species. 



LITERATURE. 



1. Entomology with reference to its biological and economic 

 aspects by J. W. Folsom. Chap. 2. 



2. Descent of man by C. Darwin. Chap. 10. 



3. Description of new or little-known Orthoptera by L. 

 Peringuey. Annals of the South African Museum. Vol. XV. 

 part V. 



