84 Mr. E.I. Pocock on Neotropical Scorpions. 



smooth and not (or scarcely) carinate 

 beneath ; the fourth scarcely keeled, 

 being at most weakly aranular. 

 a*. The body, limbs, and tail densely and 

 closel}' punctm'ed ; with a large 

 tooth at the base of the immovable 

 digit and no tooth on the brachium. mnazonicus, Sim 

 b^. The trmik, limbs, and tail not densely 

 punctured ; with at most a small 

 tooth on the immovable digit. 

 a'. The fourth caudal segment gi'anular 

 beneath ; the brachium with a 

 large anterior tooth. 

 a^. Vesicle smooth above and below ; 



tail shorter chrysopus, sp. n. 



6". Vesicle granular above and be- 

 low ; tail longer Karschii, nom. nov. 



A" The anterior four caudal segments 

 entirely smooth and polished be- 

 neath ; the brachium with at most 

 a small tooth. 

 a'. The upper caudal keels very 

 distinct and granular ; the 

 spaces between them also 

 granular ; the last tergite 

 laterally distinctly granular ; 



baud not keeled Keyserlitigii, sp. n. 



b''. The upper caudal keels weak, 

 and at most weakly granular ; 

 the last tergite also smoother. 

 (i^. The hand keeled; the supe- 

 rior caudal keels a little 

 stronger and feebly granu- 

 lar lepturus, Thor. 



h^. The hand not keeled in 5, 

 scarcely so in the S ; the 

 superior edges of the ante- 

 n or caudal segments smooth 

 and rounded Van Benedenii, Gerv. 



Chactas Van Benedeniij Gervais. 



Chactas Van Beneclenii, Gervais, Arch. Mus. iv. p. 232, pi. xii. figs. 40, 

 41, 



The British Museum has two examples of this species, both 

 of which were obtained in Colombia bj Mons. Goudot ; both 

 are from Ibaque and both bear tickets, affixed either bj 

 Gervais or Goudot, upon which the specific names are written. 



One example is a male and shows the extraordinary elon- 

 gation of the palpi that Gervais has figured. The hand-back 

 is longer than the movable digit and is more than twice as 

 long as the width of the hand. In the female the palpi are 

 much shorter and more robust. The carapace is minutely 



