652 Proceedings of the Royal Irish Academy. 



thorax. Dr. Sliai-p, to whom the specimen was submitted, remarked 

 that he had never seen this variation in any European species before 

 ('92 J. 2). 



[P. agilis, Grav. The record, Ardara ('92 J. 3), should have 

 referred to P. longicornis, Steph.] 



P. vernalis, Grav. 

 TJlstee. Mtjis-stee. 

 Donegal (Coolmore, '96 J. 1).— Keny (Ballybunion, '98 C.)- 



P. ventralis, Grav. 



TJlsTEK. LsEfSTEE. 



Donegal (Foyle dist., '00 B.). — Armagh ('89 J. 4). — Fermanagh 

 (Belleisle, '98 Pr.).— Wexford (Enniscorthy, Ht.). 



P. discoideus, Grav. 



Ulstee. Ledcstee. 



Armagh ('92 J. 4).— Fermanagh (Belleisle, '98 Pr.).— Dublin ('78 

 M.). 



P. quisquiliarius, Gyll. 



UlSTEE. CoiSTN AUGHT. LeL^STEE. MUoS^STEE. 



Donegal (Eoyle dist, '00 B.; Ardara, '92 J. 3; &c.).— Ai-magh ('93 

 J. 4; Coney Island, Lough j!^eagh, J.). — Monaghan (Scotstown, J.). — 

 Sligo (Lough Gill, J.). — Galway (banks of the Corrib, '95 Ht. 6; Clon- 

 brock, '96 Ht. 2). — "Wexford (Slaney estuary, Ht.). — Limerick (Lough 

 Gur, Ht.). — Kerry (between Glengariff and Kenmare, Cs.). 



Fairly common on banks of streams and lake shores in the north 

 and west of Ireland, but rare in the east. The species is almost of 

 world wide range. 



Yar. dimidiatus, Er. 



Ulstee. 



Donegal (Foyle dist., '00 B.). — Ai-magh (Lowry's Lough and Coney 

 Island, Lough ISTeagh, '89 J. 1). 



Under stones near the water's edge, where they are exceedingly 

 active and difficult to catch. In the Haliday collection there are 

 specimens both of the type and variety taken in the Lough Neagb 

 district, probably on the Antrim shore. 



