220 ME. C. J. WITH ON SOUTH-AMEEICAN CHELIFEEIN^ 



"tactile" hair of tarsus IV.), but also in distinguishing nearly related species 

 {cf. for instance Ch. javanus Thor. and Ch. flebejus With). As a whole, the value of 

 these organs can scarcely be too strongly emphasised, not only when our purpose 

 is the mere determination of a species, but also when we wish to understand its 

 real systematic position ; of course, it is not of much value to examine the legs 

 in situ: the first and the fourth pair on the right or left side should be dissected 

 off and measured exactly. 



The colour of the palps and dorsal surface of the body is sometimes of value, that of 

 the rest of the body is non-important in the description of species. 



Finally, it should be emphasised that it is of the greatest interest to determine the 

 sex of the specimen to be examined. So far as the terminology, measurements, &c. 

 are concerned, I refer to my earlier publication [cf. 20. pp. 56-58). 



I. Group of Chelifee cais^croides L. 



Femur of the first pair of legs with wide oblique articular cavity. Chela of the palps 



without accessory teeth. Beal eyes. " Tactile " hair of tarsus IV, well removed 



from base. 6 with genital plates of peculiar structure, with long ram' s-horn- 



shaped organs, with coxal sac, and with posterior margin of the coxa concave. 



(The claws are generally provided loith teeth and the snbterminal hair is often of 



peculiar shape. Two distinct transverse grooves, of which the posterior is 



sometimes the broader. Hairs obtuse or clavate. d generally with tergal lateral 



keels.) 



For the characteristics of this group I refer to my earlier paper (cf. 20. p. 132) and 



to the above diagnosis ; I shall only add that the suhterminal * hair is sometimes 



completely simple {cf. the descriptions). The fiagellum consists of three hairs, and a 



sexual difference is found in the galea. Twenty species at least of the great number 



of Chelifers described as having real eyes may with more or less certainty be referred 



to this group. 



From Asia : Ch. bicarinatus Sim. ; Ch. bifissus Sim. (?) ; Ch. bisulcus Thor. (?) ; 

 Ch. borneonensis Ell. ; Ch. depressus C. K. ; Ch. Mans Thor. ; Ch. mortensenii With ; 

 Ch. superbus With; and Ch. amurensis Tullgr. 



From Africa : Ch. sculpturatus Lew. ; Ch. socotrensis With ; Ch. mucronatus Tullgr. ; 

 and Ch. torulosus Tullgr. 



From Europe : Ch. cancroides L. ; C/i. disjunctus L. K. ; Ch. hermanni Leach ; 

 Ch. Unnpropsalis L. K, ; Ch. maculatus L. K. ; and Ch. meridlanus L. K. 

 From North America : Ch. biseriatus Bk. and Ch. scabiculus Sim. 



* I hope that it will meet witli general approbation to designate " the terminal lateral hair " snbterminal 

 in the future. 



