32 



The Irish Naturalist. 



April, 



Genus PORRHOMMA. 



Dr. A. R. Jackson has recently made an exhaustive study of the Genus 

 Porrlionima, with the result that many of the records already published 

 must be readjusted, as appears in the notes on the various species which 

 follow. 



[Porrhomma microphthalma Camb. | 



P. incerta Camb. 

 P. decens Camb. 

 P. Meadii F. Camb. 



Dr. Jackson has looked through all the available specimens of this 

 spider from Ireland, and finds that they must all be referred to other 

 species, most of them being referable to P. Thorellii Herman. The name 

 Porrhomma microphthalma therefore disappears from the Irish list. 



Porrhomma Thorellii Herman. 



Ulster. Leinster. 



The spiders recorded by Prof. Carpenter as P. microphthalma Camb., 

 which were taken by Mr. Jameson in the Marble Arch Caves near Ennis- 

 killen, Co. Fermanagh, prove on examination by Dr. Jackson to be 

 P. Thorellii, as are also all the specimens of this genus taken on Lambay 

 Island and recorded in the Irish Naturalist, vol. xvi., p. 63, under the 

 names of P. microphthalma, Camb., and P. errans Bl. 



In my supplementary list of the Spiders of Ireland [Proc. R. I. Academy, 

 1909) I recorded P. microphthalma from Fenagh, Co. Carlow, one of these 

 specimens proves to be P. Thorellii, whilst the other belongs to the next 

 species, P. Camphellii F. Camb. 



Finally three females which I took at Ballycastle, Co. Antrim, prove 

 to be of this species. 



P. Thorellii had not previously been recorded from Ireland. Dr. 

 Jackson records it from Yorkshire, Northumberland, Cumberland, 

 Cheddar Cave and coalpits in Durham, some of the records also are from 

 cellars. 



Porrhomma Campbellii l*. Camb. 



Leinstkk. 



A singU; female of those taken at Tenagli, Co. Carlow, proves to be 

 of this species, and was kindix named for me by Dr. A. K. Jackson. This 

 is at present the only Irish record of this spider. 



Dr. Jackson records this .species from Hertfordshire, Hampshire, and 

 Xorthiunberl.md. 



