450 Mr. Newport on the Anatomy and 



Pteronabcys Califobnicus (J, capite thoraceque saturate brunneis, fronte clypeo labro- 

 que rufis, oculis ocellisque nigris, segmentis thoracicis linea longitudinal! interrupts 

 flavA, abdomine aurantiaco lateribus brunneis, stylis caudalibus basi flavis, antennis 

 pedibusque totis atris, alls obscuris nigro-nervosis sed absque maculi stigmali. 



Hab. in California, D. Hartweg. 



This species, like others of the genus, possesses the thoracic and abdominal 

 branchiae. It is very closely allied to P. Proteus, and is of the same size ; 

 but it differs from that species in having the antennae, eyes and legs entirely 

 black, the labrum and front of the head red, the wings of a darker colour, 

 more strongly veined, and without the stigmal patch. The process from the 

 eighth segment in the male also, although of the same form as in P. Proteus, 

 readily distinguishes the two species of this sex. It is broad, pilose, and 

 deeply scarred in P. Californicus, but is much narrower, and is sparingly 

 punctured in P. Proteus. 



I shall now proceed to characterize the new species of Perla, together with 

 a species of Nemoura, collected by Mr. Barnston in Canada. 



1. Perla citronella [Barnston MSS.), saturate flava, antennarum articulis 33-35, 



oculis ocellisque brunneis, alis hyalinis pallide luteis margine costali flavis, abdominis 

 dorso brunneo. — Long. lin. 3-3^. 

 Hab. in Canada, ad Albany River, latit. 54°. 



This species resembles the Perla jiava, Pictet, which occurs in Europe as 

 far northward as Lapland, but seems to differ from it in the antennae being 

 entirely black, the thorax yellow, without a black lateral margin, and in the 

 wings being yellow, without green nervures. It is however about the size of 

 Perla jiava, and may be only a variety. " It usually remains on the branches 

 or leaves of trees during the day." 



2. Perla minima [Barnston MSS.), nigra nitida, antennarum articulis circa 26 submo- 



niliformibus pilosis, fronte paululum excavato, palpis subclavatis, thorace angusto 

 subquadrato, stylis caudalibus IS-articulatis, alis obscuris nigro-nervosis in mari bre- 

 vibus obtusis abdomen semicooperientibus in foemina amplis corpore longioribus. — 

 Long. lin. l|-2. 

 Hab. in Canada, ad Albany River. 



This species somewhat resembles the Nemoura nigra, which is from Penn- 

 sylvania. 



