Kew — A Synopsis of the False-Scorpions of Britain and Ireland. 73 



yet imperfectly known, they form a well-marked group within the subgenus. 

 The cephalothorax is of distinctive shape ; as also are the palps, of which the 

 tibia is without marked anterio-proximal convexity ; and an unusually bold 

 granulation is combined with short strongly clavate bristles. Moreover, the 

 bi'istles of the ventral face of the abdomen (sternites vii.-xi.), instead of 

 being as usual simple or nearly so, are clavate like those of the dorsal face ; 

 and the usual tactile hairs of the extremity of the abdomen [tergite-sternite xi.) 

 are absent. 



As regards the characters by which the two species are distinguished I 

 refer to the comparative descriptions given below.' It will be seen that the 

 main differences are in the palps ; they are sufficiently marked in the palps 

 of the females ; but much more so in those of the males ; a striking fact being 

 that the modifications of the palps of the male taiic in the two species opposite 

 directions. The palps of the male are more robust than those of the female 

 in C. Wideri and more slender than those of the female in C. PoivelU. Of 

 other differences, those of the bristle-armature of the abdominal tergites are 

 of practical importance, the bristles of the posterior marginal row being 

 rather closely set in C. Wideri and rather widely set in C. Poivdli. The 

 number of bristles in the row is not a fixed character ; but it is always greater 

 in C. Wideri than in C. Poioelli. Taking tergites vi.-viii. of the male (the 

 bristles are a little more numerous in the female in both species), the average 

 number in the row is perhaps 19-20 in the first species and 12-13 in the 

 second. The bristles of the sternites are similarly less numerous in the latter 

 species, and thus the difference on the whole abdomen is great. The bristles 

 of C. Wideri are in general somewhat more strongly clavate; and this is 

 particulary noticeable on the sternites. Neither species has a tactile hair on 

 tarsus iv. ; but C. Powelli is distinguished from its ally by the presence, about 

 I removed from the base of the tarsus, of an obtuse bristle longer and less 

 decumbent than the rest. The granulation presents small differences, e.g. 

 that of the palp-femur is noticeably the stronger in C. Wideri. That species, 

 finally, is a little the larger and less deeply coloured ; and the " lyriform 

 organs " of its abdominal tergites (examined in liquid) are less conspicuous. 



' As regards C. Wideri, the description is a revision of that previously given by 

 me (20). That description relates solely to G. Wideri, without admixture of C. Powelli, 

 and the illustration (20, fig. 6) represents the female ; but " Ewhurst " among the 

 localities belongs to G. Poivelli and should be cancelled. In the former paper, and again 

 here, the length of the body is given in millimetres and tenths ; but from the extensible 

 abdomen such measurements, valueless in themselves, merely give an idea of the relative 

 size of the animals. This character of the abdomen has to be borne in mind also when 

 referring to the drawings ; they illustrate primarily the general shape of the palps. Some 

 of the tactile hairs are shown ; but all the bristles are omitted. 



