My. E. I. Pocock on Neotropical Scorpions. 87 



CJiactas Icevipes (Karscli) . 



Chactas kevijjes, Karsch, Mittli. Munch, ent. Ver. 1879, p. 131. 



The species that Dr. Karsch described as Broteas Icevi'pes is 

 a Chactas. The British Museum has a single male example 

 of it. 



Chactas cequinoctialis (Karsch). 



Chactas (eqiiinoctialis, Karsch, t. c. p. 130. 



This species, described as a Broteas, is also a Chactas. 

 The Museum has a male example from Porto Cabello. 



Chactas KeyserUngii, sp. n. 



Colour pitch-black ; legs, lower surface, and vesicle just 

 tinted with ferruginous. 



Curapace smooth and polished above, distinctly granular 

 at the sides, tiie anterior border evidently emarginate and the 

 longitudinal furrow deep, as long as the first and second 

 caudal segments and one third of the third ; distance between 

 the median eyes rather greater than a diameter, that between 

 the lateral about equal to a diameter. 



The tergites smooth and polislied, the last smooth only in 

 front and in the middle of its upper surface, the rest being 

 distinctly granular. 



Sternites entirely smooth and punctured. 



Tail weak, about three and three quarter times as long as 

 the carapace, narrowed posteriorly, the second segment as 

 long as wide ; the upper surface of the segments smooth and 

 sulcate in the middle, conspicuously granular (subserially on 

 the fourth) at the sides, the superior and supero-lateral keels 

 present and distinctly granular, as is the interval between 

 them ; the lower surface of these segments smooth and 

 polished, the fourth only obsoletely keeled at tlie sides; the 

 fifth segment more than twice as long as wide ; its upper 

 surface sulcate in front, fiat behind, and in front distinctly 

 granular at the sides, the edges rounded, granular, the lateral 

 and lower surfaces also granular, the median lateral keel 

 present only in front; the infero-lateral and median keels 

 distinct and granular ; vesicle serially granular below and at 

 the sides and very sparsely so above, flat and sulcate above, 

 as Avide as the fifth segment. 



Balpi elongate ; the humerus and brachium granular and 

 carinate, the latter with one or two small denticles above and 

 below at the base of its anterior surface ; nxanus long and 

 slender, not twice as wide as the brachium, its width a little 



