172 Proceedings of the Royal Irish Academy. 



which so markedly distmgiiishes it from other British species, points to 

 relations with the two western species Heloclrilus [A.) Molleri (Eosa), and 

 H. [A.) M'dhii i^Michaelsen). 



Among the specific characters will probably be the position and extent of 

 the clitellum, and the shape of the prostomium. 



Habitat — Clare Island, Co. Mayo, West of Ireland. 



Helodrilus (Dendrobsena) rubidus, typicus (Sav.). 



1892. A. (B.) arhorea, Friend in Journ. Linn. Soc. xxiv., p. 301. 



1893. B. a., Friend in Irish. Nat., vol. ii., p. 39. 

 1897. A. arhorea, Friend in Zoologist, p. 458. 



1900. H. {D.) ruhidus., Michaelsen in Tierreich, x., p. 490. 

 1907. H. {D.) r. typicus. Southern in Irish Nat., vol. xvi., p. 79. 



^aSi^a^— Ireland. Counties Kerry, Wicklow, Dublin, Donegal. 



England. Lancashire (Adlington). 



Scotland. Midlothian (Eavelrig). 



"Wales. Merionethshire (Barmouthj. 



Isle of Man. (Laxey Glen; Poru Erin). 

 Distribution — British Isles ; Iceland ; Germany ; France ; Switzerland ; 

 Siberia ; North America. 



Helodrilus (D.) rubidus, var. subrubicunda (Eisen). 



?1837. Zumhricus xanthurus, E. Templeton in Mag. Nat. Hist., vol. ix,, 

 p. 235. 



1892. A. (D.) subriiMcunda, Friend in Journ. Linn. Soc, xxiv., p. 299. 



1893. A. s., Friend in Irish Nat., p. 238. 

 1897. A. s., Friend in Zoologist, p. 458. 



1900. H. (/).) r., var. s., Michaelsen in Tierreich, x. p. 490. 

 1907. H. {D.) r., var. s., Southern in Irish Nat., xvi., p. 79. 



This is one of the commonest British species, and is almost invariably 

 found under the bark of fallen trees. 



Habitat — Ireland. Cos. Kerry, Cork, Limerick, Tipperary, Wexford, 

 Wicklow, Dublin, Mayo, Armagh, Galway, Down, 

 and Donegal. 

 England. Lancashire (Adlington). 

 Isle of Man. (Snaefell summit, 2000 feet). 

 Distribution —British Isles ; Europe ; Siberia ; North America. 



