ORTHOPTERA SALTATORIA. 675 



domesticus the " cricket on the hearth " : the latter seems strangely 

 devoted to the dwellings of man, and it is doubtful if it leads a truly 

 wild life. The adult male alone chirps. Platyblemmus ; Nemobius 

 sylvestris is taken in the New Forest. 



5. Oecanthinae. Oecanthus with distinct diurnal and nocturnal 

 " songs." 6. Trigonidiinae. Stenogryllus. 7. Eneopterinae. 



Order 7. PLECOPTERA * (PERLARIA). 



Fair sized insects with anterior wings long and slender, posterior 

 wings larger and folding like a fan, both pairs membranous with 

 very numerous nervures ; the coxae are small and separated 

 laterally ; larvae aquatic ; metamorphosis slight. 



The " stone-flies " are a very small order of inconspicuous 



FIG. 426. A. Perlid larva, lateral aspect (after Graber).; k gill-tufts ; st stigmata ; B. 

 larva of Perla bicaudata (after Westwood). 



insects, the described species of which hardly surpass two hundred 

 in number. Their body is somewhat flattened. The head 

 bears long, multi- segmented antennae, and as a rule somewhat 



* Imhof, Beitr. Anat. Perla maxima., Inaug. Dissert. Aarau, 1881. 

 For British Species v. Cat. of Brit Neuroptera Entom. Soc. London, 1870. 



