414 Mr. R. I. Pocock 



on new 



its width about half the length of the carapace, greater ihan 

 that of brachium, and nearly equal to length of first caudal 

 segment ; tooth not close to base of aculeus, as in forcipula. 



Chelce with normal crests and granules; hand smooth, 

 normally crested, wide, its inner surface very strongly pro- 

 duced, its width equal to about half the length of the movable 

 digit, less than that part of the immovable which is distal to 

 the tooth ; digits not widely separated basally, but the movable 

 strongly lobate, the immovable correspondingly sinuate; 13 

 rows of teeth on the movable. 



Legs granular. 



Pectinal teeth 15-16 ; an angular expansion at the base of 

 the teeth. 



Measurements in millimetres. — Total length 51, of cara- 

 pace 5*5, of tail 30 ; width of first segment 3, of fifth 4, of 

 vesicle 2*5, of hand 3*3, of brachium 2 ; length of hand-back 

 4, of movable digit 6'5. 



Log. Cachavi, N.W. Ecuador, 500 feet {Rosenberg coll.). 



In thickness of tail and width of hand this species 

 approaches both T. forcipula ^ Gerv., and T. pachyurus, Poc, 

 from Colombia, but differs from both in having the chelae 

 and legs of a much paler colour than the trunk and tail and 

 the digits basally adjacent. From pachyurus it further 

 differs in having the abdominal sternal plates coarsely and 

 closely granular, the tergites more closely granular, and the 

 vesicle wider ; and ixoxn forcipula in its less coarsely granular 

 tail, with the superior crests weak and not denticulate, the 

 vesicular tooth further from the base of the aculeus, &c. 



Tityus timendusj sp. n. 



c? . — Colour a uniform black, pectines flavous. 



Carapace about as long as fourth caudal segment, like the 

 terga normally crested and granular. 



Tail about six times the length of carapace, parallel-sided, 

 first segment as wide as fourth and a little wider than fifth ; 

 all the keels strong and coarsely granular, but the terminal 

 granules of the upper crests not enlarged ; median lateral 

 crests complete on second segment and represented by about 

 6 granules lying in the middle of the segment ; fourth segment 

 considerably less than twice as long as wide (4-^ : 7^), width 

 of fifth about half its length and considerably less than length 

 of second ; vesicle coarsely granular, its width a little greater 

 than that of brachium, very nearly equal to that of hand ; 

 tooth at normal distance from aculeus. 



C/ielm normally granular and crested; hand nearly smooth, 



