• (a.) Stridulous; able to stridulate; used in stridulating; adapted for stridulation.
Strid'u·la·to·ry adjective Stridulous; able to stridulate; used in stridulating; adapted for stridulation. Darwin. 
stridulate, stridulatory 1. To produce a shrill grating, chirping, or hissing sound by rubbing body parts together; as certain insects do. 2. The sounds made by crickets, cicadas, grasshoppers, and other summertime insects when they rub special body parts together to make their shrill sounds.