124 Proceedings of the Royal Irish Academy. 



a large chitinous tooth placed near middle of ventral siirface. In one 

 abnormal specimen there are two such teeth on the left femur. 



Habitat. — An abundant and characteristic intertidal species, usually 

 occurring in crevices and between flakes where the coast is rocky, and also 

 under stones on estuarine shores. At Malahide it is found in from almost 

 dry to moist crevices in the Orange Lichen, I'elvetia, and Spiralis zones. 

 Has also been found at Ardfry, where it extends down to tlie Vesiculosus 

 zone at least. The males are less common than the females. Tlic dates of 

 capture range from February to October, and it probably occurs in all months 

 of the year, 



Lasioseius IJerlese. 



In my report on the Acarina of the Clare Island Survey (25) it was 

 pointed out that the Seius group of the family Laeiajjlidac was badly in need 

 of revision. Tlie sjwcies there recorded were referred to the genera Seiulus 

 (Berlese) and Paraseius (Tragardh). Dr. Berlese has since published a 

 useful pajHjr (16 in which new genera and sub-genera are established, eitlier 

 with brief diagnoses or by tlie naming of types. 



Berlese indicates Snu.i muricatits (C, L. Koch) as the type of the genus 

 Lasioseius, 90 it is necessarily also tlie type of the sub-genus lasioseius (s. str.). 

 In this specie's the tarsi and ambulacra are of the form usual in tiie Seius 

 group of genera. It .seems unsatisfactory, however, to include in the same 

 genus such species as Z. Ualiciu, L. sen-alus, and L. grandis, in which tlie 

 tarei are much attenuated, and the ambulacra are modified into a bristle-like 

 form. Sucli species ."^liould. in my opinion, be included in a separate genus, 

 and as the name Episeius has lieen suggested for tliis purpose by Hull (26), 

 with E. serralm (Halbt.) as the type, this name must be used. In a previous 

 paper I endeavoured to establish Paraseius Tnig. for the species with modified 

 ambulacra, but unfortunately Triigardh indicated Gamnsvs imdlis Kramer 

 (49; as the type of his genus. Dr. Berlese is now convinced that Paraseius 

 is the same as Epicrius Can. et Fanzago, for the reason that Kramer's species 

 is nothing more than a uymphal fonn of Epicrim //cotndricus, 13crl. (17). 



Episeius ^randis (Berlese). 



1916 Lntioseius ffraiuli.'^ Berle-so 16, p .'U. 



Habitat.— Salt marsh on Malahide Island, a few specimens found under 

 shells and stones, May. Tlie females are abundant in Malahide estuary-, 

 under stones in a partly dry channel of the Broadmeadow Water. It 



