378 Mr. R. T. Pocock on 



wider than the hand or the hrachiura ; an acute subaculear 

 tooth about twice its basal diameter from the aculeus. 



Chehe very finely granular above, with coarsely and evenly 

 granular crests ; hand narrow, as wide as brachivim, its width 

 two thirds the length of the underhand, which is less than 

 half that of the movable finger ; upper surface of hand 

 shagreened, with feebly granular but conspicuous finger- 

 keels ; movable finger longer than fifth caudal segment, 

 weakly lobate, with eight rows of teeth. 



Legs weakly granular, with granular crests. 



Pectines strongly expanded at base, as in R. junceus, with 

 19-20 teeth. 



^ . — Tail a little longer than in female, nearly six times 

 as long as carapace, the latter as long as the first -\-\ oi. the 

 second and slightly shorter than the fifth segment, fourth 

 segment about one fourth longer than wide. 



Hand smooth, not crested, much wider than brachium, its 

 width nearly equal to the length of the underhand, which 

 exceeds half the length of the movable finger, the two fingers 

 separated by a narrow -^-shaped space. 



Pectinal teeth 24-25. 



Measurements in millimetres. — ? . Total length 75 ; cara- 

 pace 8'5 ; tail 44, width of first segment 5, of fourth 5"5, of 

 brachium 2*5, of hand 2*8 ; length of underhand 4, of movable 

 finger 10. 



^ . Total length 77 ; carapace 8*5 ; tail 47, width of 

 first segment 5*5, of fourth 6'5, of brachium 2'5, of hand 4'2; 

 length of underhand 5, of movable finger 9. 



Loc. Brazil (in Mus. Brit.). 



1 formerly supposed the specimens here described to be 

 referable to Tityus agamemnon of C. Koch ; but according to 

 Kraepelin, who has presumably examined Koch's types, 

 T. agamemnon has only eight keels on the second and third 

 caudal segments, as m junceus. Also the median area of the 

 first abdominal sternum is said to be granular. The species, 

 which I have pleasure in dedicating to Dr. Borelli, is most 

 nearly related to R. laticauda, Thorell. 



Genus Tityus, C. Koch. 



Tityus Engelkei, sp, n. 



Allied to T. pachijurus and T. metuendus, but differing 



from both in colour as well as in certain structural characters. 



Prevailing colour yellowish brown, frontal portion of cara- 



