136 Proceedings of the Royal Irish Academy. 



zones. At MuUanny, on Lhe Mayo coast, it is abundant under stones just 

 above high-water mark, September ; and it was found in the debris of old 

 nests of sea birds on the Bill Eocks, as recorded in (25). 



Hermannia reticulata Thor. 



Malahide estuary, found crawling on a green alga-like weed on bank of 

 the Broadnieadow Water, with Oribata Lucasii Nic. Eecorded from Clare 

 Island and llie Westport district in 25. 



Nothms invenostus Michael. 



Found under lichens (Lichciui pygmaca) growing on large boulders on the 

 south shore of Howth, Co. Dublin. Splashed by high tides, though probably 

 not intertidal. 



.Sub-Order S A KCOPl'0 1 1 )E A. 



Family TTROGLYPHIDAE. 



Tyroglyphus littoralis sp. nov. PI. XXII, fig. 20 a,d.) 



The discovery of an uiidescribeil species of this family living on the sea- 

 shore is of interest. As far as I am aware, the only pre\'iously known 

 Tyroglyphids found in this habitat are the species of Hyadesia, all of which 

 arc intertidal. (I once found a colony of Ti/iih/Ii/iJius lomjior living between 

 limestone flakes in the Orange Lichen zone at Malahide, ihfuigh probably in 

 this case the mites were introduced with debris deposited on the shore. It 

 is a species of varied habitats, and is of almost world-wide distribution.) 



FcmnU. — Length al>oul 616^; breadth, 418;i. The entire animal is 

 pyrifonn. Texture smooth ; hyaline, the expulsory vesicles ajipearing as large 

 brown spots. Cephalotliomx of the usual shape, distinctly narrower than 

 abdomen, strongly wonstricled in front, so that the rostral part i.s rather long 

 and narrow, and much as in T. hclcrocomm Michael (37, 1'l. XXXIII, fig. 1). 

 Cephalothoracic hairs in a row; the two outer ones are very lung, inner 

 ones short (length about GS/i), rostral hairs reaching a little beyond 

 end of mandibles. Alxlomen with rather prominent humeral corners, 

 slightly constricted behind these, thence widening gradually to beyond the 

 middle, and diminishing to the end margin, which is produced at the centre 

 in a pointed process. Apparently this process is not homologous with the 

 tubular bursa copulatrii found in the genus Glycyphagus. On the dorsum 

 there are five pairs of long plain haire, three of wliich are marginal, and there 

 are four pairs of comparatively short hairs placed on or near the anterior 

 margin. 



