I02 



The Irish Naturalist. 



June, 



ISOPODA TeRRESTRIA. 



Ten species of Woodlice had been recorded from Co. 

 Louth, and of these two — Porcellio dilalatiis and P. laevis — 

 were not seen at Carhngford. My Hst, however, contains 

 ten species, of which tw^o — Trichoniscus roseus and Haploph- 

 tJialmus Mengii — are new to the fauna of the county. I 

 had hoped to find Trichoniscoides alhidus and Cylisticus 

 convexus, but these species still await discovery in Louth. 



Ligia oceanica (Linn.). — The shore at Carlingford, being in the main of a 

 sandy nature, does not afford a suitable habitat for this species, and 

 it is not therefore surprising that only one specimen was seen. It is 

 evidently not numerous here, as I recollect on a previous occasion 

 searching for upwards of an hour for this species before succeeding 

 in finding a specimen. 



Trichoniscus pusillus Brandt. — As obtains ever^-where else in Ireland, 

 this species proved very common in damp situations. It was found 

 in every place where there was sufficient moisture. 



*T. roseus (Koch). — This species existed in considerable numbers on and 

 about a large rubbish-heap by the side of the tennis court in front 

 of the hotel. As the situation was artificial, it is possible that it may 

 have been imported, but of this no evidence could be detected. In 

 my experience this species has always been found in dry situations, 

 i.e.y among cinders, etc., and the heap in question doubtless afforded 

 a congenial habitat. 



T. pygraaeus G. O. Sars. — It is extremely probable that this Httle species 

 is common all over Ireland, for in every county, with the exception of 

 Mayo W., where search for it has been prosecuted it has been found. 

 In my experience it is not so readily discovered between April and 

 October as in the colder months, and this factor may account for the 

 failure to find it in West Mayo, where visits were paid in the late 

 spring or summer. At Carlingford it was noted in small numbers in 

 various places. 



*Hsplophthalmus Mengii (Zaddach). — So far as our present knowledge 

 points, this species appears to be not uncommon, mainly in the 

 vicinity of the coast, and is generally found under deeply-imbedded 

 stones. At Carhngford four specimens were found, and it did not 

 appear to be numerous. Mr. A. W. Stelfox t^lls me that in Drumbo 

 Glen, Co. Down, he frequently turned over suitable stones and found 

 it in small numbers, but that on repeating the search late in the even- 

 ing it proved abundant ; and he suggests that during the day it may 

 burrow in the ground and only approach the surface at the coming 

 of night. In Ballynamona Wood, on the shore of Lough Gill, Co. 

 Sligo, I found this species exceedingly numerous just previoiis to 

 nightfall, and looking in the same place during the forenoon I did not 

 find a single specimen. 



Philoscia muscorum (Scopoli). — This species proved common everywhere. 

 Most of the specimens were of the typical brown colour with more 



