THE WOODLICE (Crustacea Isopoda Terrestria) 

 OF ULSTER. 



BY 



NEVIN H. FOSTER, F.L.S., M.R.I.A, M.B.O.U. 



The following list of the Woodlice (commonly designated 

 " Slaters ") hitherto found in Ulster has been compiled after 

 upwards of ten years' collecting in which valuable assistance has 

 been rendered by the following Members of the Club : — Mrs. and 

 the Misses Foster, Dr. R. F. Scharff, Rev. W. F. Johnson, 

 Rev. Canon H. W. Lett, Messrs. D. C. Campbell, J. N. Milne, 

 Robert Patterson, the late W. H. Patterson, R. LI. Praeger, A. W. 

 Stelfox and R. J. Welch. In the present paper is incorporated 

 the information (then available so far as it concerns Ulster) 

 already published in " The Woodlice of Ireland"* and "Additions 

 to the distributional records of Woodlice in Ireland."! 



The total number of Woodlice recorded from Ireland 

 amounts to 28 species, including those which have been un- 

 doubtedly introduced and which here exist exclusively in green- 

 houses and gardens. Of the 28 Irish species 21 have been found 

 in Ulster, and the subjoined table shows the number of species 

 recorded from each County Division. It will be noted that the 

 County of Donegal has been divided into East and West 

 Divisions in accordance with Praeger's scheme. J These two 

 divisions are separated by a line running N.E. and S.W. from the 

 head of Donegal Bay to the head of Lough Swilly, dividing the 

 Baronies of Bannagh, Boylagh and Kilmacrenan from Tirhugh, 

 Raphoe and Inishowen. 



* Proc. R.I. Acad., Vol. XXIX. (B), No. 4. 

 t Irish Naturalist, Vol. XXII., p. 45. 

 % Irish Topographical Botany, 1901. 



