512 Mr. E. I. Pocock on new Species of 



is considerably further from the longer aculeus than it is in 

 forcijmla] the whole tail, too, is much smoother and armed 

 with less coarsely denticulate superior crests. The hand is 

 wider than in forcipula, being distinctly wider than the 

 brachium, with keels much weaker and smoother ; hand-back 

 half as long as movable digit. Pectines fractured (number of 

 teeth probably the same as in male). 



S . Differs from that of forcipula in much the same cha- 

 racters as the female, the keels and granules being much 

 weaker and the vesicle only as wide as the brachium (much 

 wider in forcipula), the aculeus being longer, with the tooth 

 further from its base. The hand, on the contrary, is 

 narrower, its width being equal to the length of that portion 

 of the immovable digit that is distal to tlie tooth, whereas in 

 forcipula it is much greater. Pectinal teeth 19 (in forci- 

 pula 16). 



Measurements in millimetres. — ? . Total length 61, of 

 carapace 7*3, of tail 41, width of its first segment 4'5, of 

 fourth 5, of vesicle 3, of brachium 3*2, of hand 3-6. 



(J . Total length 67 ; length of carapace 7*3, of tail 44, 

 length of first and fouvtli segments 8 ; widtli of first segment 

 4-5, of fourtli 6, of vesicle 3, of bracliium 3*2, of hand 5. 



Loc. Colombia. Two examples, male (type) and female, 

 obtained from Turner, 



Tityus macrochirus, sp. n. (Figs. 3-3 1>.) 



Allied Xo imchyurus and forcipu/a. 



2 . Colour of trunk and tail brownisli or greenish black ; 

 legs and chelag, especially the latter, reddish yellow ; fingers 

 black. The transverse crests on the terga not so strong; the 

 upper crests of the tail stronger than on the fourtli segment, 

 ending in a long denticle, as on the second and third ; fourth 

 segment a little wider than the first ; vesicle smooth, punc- 

 tured, without granules, a little wider than the brachium, but 

 distinctly narrower than the hand, which is weakly keeled ; 

 digits shorter than in pachi/urus, the length of the hand-back 

 equalling almost two thirds that of the movable digit. Pec- 

 tinal teeth 14-16. 



d . Tail as in the female, but longer and thicker, with its 

 fourth segment a little wider than the first, its width much 

 more than half its length ; vesicle distinctly wider than 

 brachium. 



Chela longer and thinner than in pachyurus ; brachium 

 nearly four times as long as broad ; hand much thicker than 

 brachium, long, its width equal to half the length of the 



