39 118 Proceedings of the Royal Irish Academy. 



breadth of same 132/7, length of tibia 330/*. In the leg measurements it 

 approaches nearer to Berlese's variety cisalpimmi, but the tarsi are longer. 

 Distribution. — Central Europe (Berlese 16). 



Podothrombium filipes (Koch). 



Mulranny, under stone on the sea-shore, September. 



Tn all probability the single specimen found in the above locality is to be 

 referred to a variety of the present species, though the record must be made 

 with reserve until more specimens are found. According to Berlese's table 

 of the species of Podothrombium it would appear to belong to the macrocarpum 

 group, but the great length of the legs inclines me to believe that the specimen 

 may be a variety of P. filipes. The size of the creature and the structure 

 of the palps, &c, also agree with that species. The measurements are as 

 follows : — length of the body about 1460/* ; the length of the first pair of legs 

 is about 2048/* ; length of tarsus 506/*, breadth 110/* ; length of tibia 516/*.. 



Distribution. — Norway and Germany (Berlese 16). 



Microthrombidium valgum George. (PI. VIII, fig. 36.) 



Slopes of Croaghpatrick in wet sphagnum, also in sphagnum pools at 

 Mulranny and Louisburgh, July to October. 



This species is allied to M. pusillum Herm., it was described under the 

 name of Ottonia valga a few years ago by Dr. George (" The Naturalist," 1 909, 

 p. 423) from a specimen found by Mr. Evans at Aberfoyle. The following is 

 a short description of the Irish specimens : — 



The length varies from 717/* to 947/*. The colour is red. Shoulders 

 prominent, front margin concave, and the body is strongly narrowed 

 posteriorly. Cephalothorax very small ; crista a thick chitinous rod, widened 

 in front to form a lobe-like extremity which projects slightly beyond the 

 front margin of the animal. The eyes are placed immediately in front of 

 the proximal sensory area and quite close to the crista. Hair vestiture rather 

 dense, consisting of moderately long (25/* to 30/*) bristles, these are thickened 

 at the middle, and sharply pointed, with strong secondary hairs. Palps stout, 

 appendage of fourth segment short and very broad, rounded at its extremity 

 with a number of long bristles, all of which are spinous, with the exception 

 of one terminal hair ; external spine absent ; dorsal comb distinct, consisting 

 of about eight bristles. Legs shorter than the body, tarsus of first pair, in 

 side view, of an oblong shape, a little more than twice as long as broad (155/4 

 by 70/*) ; length of tibia about 90/*. 



I am indebted to Dr. George, and also to Mr. Sheppard of the Hull 

 Museum, for a loan of the type specimens of this and the following species. 



