Clare Island Survey. 



39 

 ACAEINIDA. 



By J. N. HALBERT, M.R.I.A. 



Section II. — Terrestrial and Marine Acarina. 



Plates IV-VIII. 



Read June 8, 1914. Published March 27, 1915. 



INTRODUCTION. 



The following report contains a record of certain groups of the terrestrial 

 mites and also of the marine species belonging to the family Halacaridae 

 found during the recent Survey of Clare Island and the surrounding district. 

 Except as regards one or two of these groups the list must be looked on 

 as very incomplete. During the field work of the Survey it was necessary 

 to give a good deal of attention to insects and other invertebrates so that 

 little time was available for collecting the Acarina. Gradually, however, a 

 number of species were got together, especially during my later visits to the 

 district, and through the help of friends in sending gatherings of moss and 

 other materials in which these small creatures may be found. 



As a result, there is now available a list of 186 species which, together 

 with the 80 fresh-water mites, recorded in the previous section of this 

 paper (39 i), bring the known acarine fauna of the district up to 266 species. 

 Incidentally, there are included some records of mites from other parts of 

 Ireland identified while the present paper was being prepared ; these are 

 printed in italics, and include the only records of Irish mites outside the 

 limits of the Clare Island district, at least in so far as the groups dealt with 

 are concerned. 



The bulk of the species belong to those two dominant groups of the free- 

 living mites, the Gamasoidea and the Oribatoidea. As a matter of fact the 

 list is made up as follows : — 



Gamasoidea, . 72 species (including Labidostomma). 



Ixodoidea, . 

 Oribatoidea, 

 Sarcoptoidea, 

 Thrombidoidea, 



1 species. 

 60 species. 



5 species. 

 48 species (including the Halacaridae). 



B,I,A, PKOC,, vol. xxxi, G 39 



