ON THE SYNONYMY OF THE PERLITES. 35 



Genus III. — Perla, Geoffroy. 

 Phryganea, Linneus ; Semblis, Fabricius, &c. 



The wings are abbreviated in the male, in the female they 

 are fully developed ; the longitudinal nervures towards the 

 tips of the wings are uninterrupted (or nearly so) by trans- 

 verse nervures. 



* Species aberrans. 



Sp. 1. Perla abnormis. (Corp. long. .9 unc. alar, dilat. 2.5 unc.) 



„ „ Newman, ' Entomological Magazine,' vol. v. p. 



177. 



Testaceous brown, with scarcely any shade of different colour, the eyes 

 and ocelli alone being obviously darker. Wings tinged with brown, the 

 upper portion of the tips of both fore and hind wings have various trans- 

 verse nervures, forming a decided although small portion of the wing com- 

 pletely reticulated. 



Inhabits North America. Several specimens of this insect 

 are in the cabinet of the British Museum, also in that of the 

 Rev. F. W. Hope ; and one, much injured and discoloured, 

 owing to which circumstance it was originally characterised 

 as " fuscous, " in that of the Entomological Club, (donor R. 

 Foster.) The aberrant species is here again placed before the 

 normal ones, because it serves to connect the latter with the 

 species of Pteronarcys. 



** Species normales. 



Sp. 2. Perla Lycorias. Caput prothorace manifeste latius, testaceum; 

 oculis ocellisque fuscis: prothorax testaceus linea longitudinali nigra, 

 alarum apices haud reticulati. (Corp. long. .8 unc. alar, dilat. l.S 

 unc.) 



Head considerably broader than the prothorax, and scarcely at all im- 

 mersed therein, testaceous, with the eyes and ocelli fuscous, and in some 

 specimens the ocelli are enclosed in a somewhat quadrate fuscous spot. — 

 The prothorax is testaceous with a black longitudinal line. The meso- and 

 metathorax are shining and pale brown, scarcely testaceous. The abdomen 

 is brown. The nervures of the wings are testaceous, the tips of the wings 

 have only the longitudinal nervures. The legs are testaceous. 



Inhabits Canada. In the cabinets of the British Museum 

 and the Rev. F. W. Hope. 



Sp. 3. Perla Xanthenes. (Corp. long. .75 unc. alar, dilat. 1.75 unc.) 



„ „ Newman, ' Entomological Magazine,' vol. v. p. 



178. 



Pale yellow, the nervures of the wings, the antenna, and legs of the same 

 colour: the eyes and ocelli alone are black. The prothorax is quadrate but 

 much narrower posteriorly. 



