NEW AND RARE BRITISH SPIDERS 49 



side is male and the other female, with no atrophy or 

 distortion of parts except where mutual accommodation 

 is necessary on the median line. Naturally this disturb- 

 ance of structure shows itself chiefly in the sexual region 

 of the epigaster. In the present instance the female side 

 of the external genitalia suffers less modification than the 

 male side (pi. ii., figs. 8, 9). In one particular, however, 

 this individual differs from all other bisexual spiders I 

 have ever seen or heard of; for while the right side of 

 the cephalothorax is male and the left female, in the case 

 of the abdomen the sexes are reversed — the right side 

 being female and the left male. 



Lophomma subasquale Westr. An adult female, Gos- 

 wick links, June. 



Entelecara thorellii. Both sexes plentiful, Fenham and 

 Ross links, May and June. 



Entelecara trifrons Cb. Both sexes, Fenham, May. 



*Entelecara omissa Cb. An adult female was taken at 

 Ninebanks, in November, at a depth of five or six feet in 

 a "dead-heap" — that is, a heap of limestone boulders, 

 the refuse of an old lead mine. 



Notioscopus sarcinatus Cb. Mr. Harrison has again 

 procured this species pretty freely at the original spot 

 on Eston Moor, Cleveland, but as far as I know it has 

 failed to turn up elsewhere. Simon (Hist. Nat. d. 

 Araignees, 2nd ed., i., 667) rightly recognises the 

 relationship between this genus and Oedothorax Bertk., 

 from which it may be distinguished by the recurved line 

 of the front eyes and the five inner fang-teeth. 



Caledonia aliena Kulcz. — sub-sp. evansii Cb. Caledonia 

 evansii Cb. of British authors. 



Dr. Kulczynski's excellent figures and description of 

 his Erigone aliena(Ava.n. in Camtsh. Coll., 1885) long ago 

 suggested to me that this spider was identical with the 

 species known in Britain as Caledonia evansii Cb. During 



D 



