86 Mr. R. I. Pocock on Neotropical Scorpions, 



has six eyes, with the tail nearly one third longer than the 

 trunk (30 : 21) and the carapace shorter than the anterior 

 three caudal segments, it is hardly likely that Karsch's belief 

 will meet with many supporters. If the type in question is 

 in the Berlin Museum at all, it will probably, I think, be 

 found amongst the specimens in that institution which were 

 identified as Oinsthacanthus elatus (Gerv.) by Peters. 



But since Scorpio lepturus of Beauvois, with its eight eyes, 

 is probably not a Cliactas at all, Thorell's name lepturus can 

 stand for the species to which it was applied, with Thorelln^ 

 Karsch, as a synonym ; while for the species of Chactas 

 which Karsch described as lepturus of Beauvois, I propose 

 the name Karschii, in memory of this author's contribu- 

 tions to the elucidation of the species of this genus. 



The British Museum has a single specimen of a scorpion 

 from New Granada (Colombia) which I identify as lepturus 

 of Thorell. It appears to be young, since it measures only 

 35 millim. in length, the tail being 15'5 and the carapace just 

 under 5 ; the anterior three caudal seguients taken together 

 measure 5*5. 



The carapace is mostly smooth, being tinely granular only 

 at the sides ; the tergites are smooth and polished, the last 

 being weakly granular laterally, with two tubercular crests on 

 each side. 



The superior keels of the tail are scarcely developed, being- 

 represented principally by a large posterior tubercle; the 

 super 0-1 ateral keels, too, are weak and only very feebly 

 granular. 



The hands of the palpi are considerably longer than wide, 

 finely granularly rugulose and carinate above. 



The pectinal teeth are 7 on each side. 



Chactas amazonicus, Simon. 

 Chactas amazonicus, Simon, Ann. Soc. Ent. Fr. (5) x. p. 384 (1880). 



Described from Pevas (Peru). The Museum has two 

 examples ((^ ? ) from Moyabama, in the same country. 



The male is considerably more granular than the female, 

 and has a longer and stouter tail, this organ being more than 

 three and a half times the length of the carapace, while in 

 the female it is less than three and a half times the length. 



Very characteristic of the species is the tooth at the base 

 of the immovable digit and the notch on the movable to receive 

 it — features which occur in both sexes. The palpi of tlie 

 male do not appear to be longer than in the female. 



