124 The Irish Naturalist. 



XanthoIInus glabratus, Grav — Coohnore. 

 X. punctulatus, Payk.— Cavan, common. 



X. tricolor, F. — Coolmore; hitherto only recorded from the east 

 coast. 



* X. dlstans, Kr.— Coolmore. Banks of R. Erne above Ballyshannon. 

 It has also occurred at Bundoran. It is a northern and alpine insect. 



X. linearis, 01. — Coolmore. Cavan, common. 

 Othius fulvipcnnis, F.— Ballyhaise, Oak wood. 

 O. melanocephalus, Grav. — Ballyhaise, Oak wood. 

 Lathrobium clongatum, L.— Shores of Lough Oughter. 

 L. prunnipcs, F.— Coolmore. Cavan, common. Killarney. 



* L. pallidum, Nord. — Coolmore. Another south of England 

 species now recorded as Irish for the first time, from a north-western 

 locality. 



Stenus guttula, Mull. — Coolmore, plentiful on edges of little 

 streams. 



S. Pimaculatus, Gyll. — Farnham demesne. 



S. juno, F. — Farnham demesne. 



S. carbonarius, Gyll. — Shores of Lough Oughter; only other Irish 

 locality is Killarney. 



S. impressus, Germ.— Carlingford. Cavan. 



S. pallitarsis, Steph . — Cultragh Lough. 



S. bifovcolatus, Gyll.— Near Cavan. 



S. nitidiusculus, Steph. —Cavan, common. 



S. picipes, Steph.— Ballyhaise, &c, common. 



S. similis, Herbst.— Cavan, common. Coolmore. 



S. tarsalis, Ljun.— Lough Oughter shore. 



S. Iatifrons, Er -Coolmore. Cavan. 



Bledius arcnarius, Payk. — Coolmore, very numerous in the sandy 

 beach. 



* B. fuscipes, Rye. -Coolmore, rare. New to Ireland; a northern 

 insect in Great Britain. 



Platystethus arcnarius, Fourc— Coolmore. Cavan, common. 



Oxytclus rugosus, Grav.- Coolmore. 



O. nitidulus, Grav.— Cultragh Lough. 



O. tctracarinatus, Block.— Coolmore, plentiful. 



Haploderus ccelatus, Grav.— Near Cavan. 



Lcstcva Iongelytrata, Goeze.— Coolmore. 



Lathrimceum unlcolor, Steph.— Cavan, common. 



Omalium riparium, Thorns.— Coolmore. 



AnthoPium ophthalmicum, Payk.-Narrow Water. 



(TO BE CONTINUED.) 



POTAMOGETON UNDULATUS, Wolfgang, IN 



IRELAND. 



BY ARTHUR BENNETT, F-L.S. 



Recently I have gone through a good many gatherings of 

 Potamogeton perfoliatus, L., &c, with a view to see if any 

 could be referred to P. undulatus, Wolfgang ; attention to 

 which has been called by Mr. Fryer in the Journal of Botany 

 for 1891 (p. 289, t. 318), and in the Annals of Scottish Natural 



