Clare Island Survey — Acarinida. 39 73 



Laeleps (Cosmolaelaps styliferus sp. nov. (PI. VI, fig. 19«-c.) 



Allied to the preceding species, but it is smaller, and the male armature 

 of the legs and palps is different. 



Male. — Length 473u, pale straw colour. Second leg very stout, 

 trochanter armed on its outer side with a strong spur (fig. 19a), fourth pair 

 (fig. 1 9b) equally stout, seen from the under side the corners of the trochanter 

 are slightly produced and spur-like, the end margin of the patella has a short 

 stout spine, which is apparently much stronger than in L. vacuus; tibia with 

 three well-marked prominences. Chelicerae small (fig. 19f), free chela with two 

 very distinct teeth, fixed chela with a strong tooth, the male appendage is 

 comparatively straight with a tooth-like process near apex, thence strongly 

 narrowed. Near the middle of the ventro-anal region there is a long dagger- 

 shaped process which is directed forwards, and reaches to about the middle 

 of the last pair of acetabula. 



A female specimen found in the same nest probably belongs to this 

 species. The length of the body is the same (473/*). The genital plate is of 

 uniform breadth, and its truncated hinder margin lies close to the anal shield. 



Locality. — Found in a nest of the small yellow ant Lasius flavus at 

 Mulranny in September. 



Laelaps (Cosmolaelaps) claviger Berl. 



I have found females of this well-marked species at Lucan and Howth in 

 Co. Dublin, and in moss received from Birr, King's County, in November. 



Laelaps (Oolaelaps montanus Berl. 



Mulranny, females found in nests of the ant Formica fusca, in September. 



A few specimens of a Laelaps found on the lower slopes of the Curraun 

 mountains are to be referred to the present form which does not appear 

 amongst the recorded British species of ants' nest mites. It is closely allied 

 to L. oophilus Wasm., but the smaller size (484/u., in the Irish specimens) 

 more elongate chelae, and the somewhat longer legs, serve to distinguish it 

 from that species. 



Distribution. — With Formica fusca in Italy (Berlese 12). 



Seiulus. 

 The aeari belonging to the Seius group of the family Laelaptidae are, as 

 regards their genera, badly in need of revision. It seems clear that the 

 generic name Seius must be restricted to Koch's Seius togatus, a peculiar 

 form which happens to be the first species described by Koch under that 

 genus. Berlese has recently founded a new genus Ameroseius (2, p. 25Sj 



