90 Mr. R. I. Pocock on Neotropical Scorpions. 



segments entirely smooth beneath, the third obsoletely carinate 

 but not granular, the fourth furnished with the normal weak 

 granular keels ; the superior lateral keels pi-esent and finely 

 granular on the anterior four segments, the superior keels present 

 and finely granular on the third and fourth segments, but the 

 superior edges of the first and second rounded and scarcely 

 granular even on the second ; the upper surface of the anterior 

 three segments mesially excavated, of the fourth nearly flat, 

 of the fifth flat behind, with rounded and only feebly granular 

 edges, and granular on the lateral surface, where there is a 

 trace in front of a median lateral keel, the lower surface 

 with the normal granular keels ; the vesicle, as wide as the 

 fourth segment, smooth above and below, only minutely 

 granular at the sides. 



Falpi robust, the humerus, brachium, and raanus finely 

 granular above ; hrachium with a bifid tubercle on the upper 

 edge of the inner surface at the base; the manus wider than 

 the brachium, length of hand-back much greater than width 

 of hand and nearly as great as the length of the movable 

 digit ; the manus convex above and almost entirely without 

 keels ; the proximal tooth on the immovable digit rather 

 larger than the rest, but there is only a minute corresponding- 

 notch on the other digit. 



Legs smootli. 



Pectines with 6 teeth. 



Measurements in millimetres . — Total length 43, of cara- 

 pace 7, of tail 23 ; width of brachium 3, of manus 5 ; length 

 of hand-back 7, of movable digit 7'5. 



Lac. • ? A single female example. 



In some respects, such as the carination and granulation of 

 the tail and carapace and the structure of the palpi, this 

 species seems to approach closely Gh. Karschii, Pocock [cf. 

 supra) ; but it certainly differs in having the vesicle smooth 

 above and below, also a very much shorter tail and a smaller 

 number of pectinal teeth. These last two characters I might 

 have looked upon as merely of sexual importance, were it not 

 that the similarity in the relative measurements of the seg- 

 ments of the palpi points to the identity of sex between the 

 type of Karschii and of clirysopus. 



Chactas Whymp)eri, sp. n. 

 (PI. V. figs. 7-7 h.) 

 Colour black ; legs ferrugino-piceous j feet and vesicle 

 ferrugino-flavous. 



Carapace nearly as long as the anterior three caudal seg- 

 ments, the frontal border y&yy distinctly emarginate in the 



