Clare Island Survey — Acaritdda. 39 111 



breadth 154^ ; length of free chela 143/a Body of the mandible with an 

 evenly rounded base, not truncated ; both chelae are without teeth, but 

 under a high magnification the edge of the free chela is seen to be very 

 minutely serrated. Palps rather large, length about 363/x ; dorsal surface of 

 the segments armed with long bristles as follows : — Second segment, two 

 widely separated bristles ; third, three bristles, middle one the longest ; 

 fourth, with nine long setose bristles. 



Distribution. — Coast of France (Moniez). 



Penthaleus ovatus C. L. Koch. 



Mulranny under stones on the sea-shore, September. 



Identified from a single specimen of which the colour during life was not 

 noted. It agrees, however, with Berlese's description and figures of this 

 mite (1, Fasc. be, n. 2), except in size. The Italian specimens are recorded as 

 measuring 400^, while the Mulranny example is 640ft in length, not including 

 the rostrum. 



Distribution. — Germany; Italy; Britain. 



Halotydeus hydrodromus (Berl. et Trouess.) var. albolineatus no v. 



The genus Halotydeus was founded by Berlese in his work on Italian 

 mites (1, Fasc. lx, n. 10). The type species is H. hydrodromus, one of the 

 littoral mites discovered by Trouessart on the coast of France and recorded 

 in a joint paper with Berlese in 1889 (17). The genus may be readily distin- 

 guished from Notophallus by the six segmented legs, and the terminal position 

 of the anal foramen. 



The form here recorded is in all probability a variety of the type species 

 from which it differs noticeably in colour. 



Berlese describes, and figures, the colouring of H. hydrodromus as follows : — 

 " (Jolor corporis nigro olivaceus, macula dorsi media rufescenti, pedibus 

 rostroque cinnabarino roseis. Oculi albo micantes." In the Irish specimens 

 the ground-colour of the body is black with a longitudinal white stripe along 

 the middle of the back, this line widens out a little at each end and extends 

 on to the cephalothorax. The legs and mouth organs are bright red. The 

 following is a short description of this variety : — 



Length about 800|U ; shape and general structure as in the type. 

 Cephalothorax with three pairs of hairs. There is a shoulder bristle, a 

 double row of a few hairs on the dorsum, and there are about five pairs of 

 hairs grouped on the posterior third of the animal ; all of these hairs are 

 straight and finely spinous. Second palp segment stout, very strongly 



P2 



