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 present and finely 
granular onthe anterior foursegments, 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 veszcle, as wide as the 
fourth segment, smooth above and below, only minutely 
granular at the sides. 
Palpi robust, the humerus, brachium, and manus finely 
granular above; brachiwm 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 smooth. 
Pectines with 6 teeth. 
Measurements in millimetres.—Total length Be of cara- 
pace 7, of tail 23; width of brachium 3, of manus 5; length 
of hand-back fp of movable digit 7°5. 
Loe. ? <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 Ch. Karschit, Pocock (of. 
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 chrysopus. 
Chactas Whympert, sp. n. 
(Pl..V. figs. 7-7 6.) 
Colour black; legs ferrugino-piceous; feet and vesicle 
ferrugino-flavous. 
Carapace nearly as long as the anterior three caudal seg- 
ments, the frontal border very distinctly emarginate in the 
