Scorpions from Ecuador. 415 



crests smooth, of medium strength ; width a little greater 

 than that of brachium, equal to area lying between ocular 

 tubercle and posterior border of carapace ; digits in contact 

 weakly lobate and sinuate ; movable digit less than three 

 times length of width of hand and rather less than twice as 

 great as length of hand- back ; 13 rows of teeth. 



Legs normally granular and crested. 



Sterna granular, fifth much more closely than the fourth, 

 fourth than third, &c., the fifth with coarsely granular keels ; 

 second, third, and fourth smooth, shining posteriorly, the 

 smooth patch largest on the third. 



Pectinal teeth 19-21 ; no angular expansion of shaft at 

 base of pecten. 



Measurements in millimetres. — Total length 70, of carapace 

 7*3, of tail 43; width of first segment 4-5, of fifth 4*5; 

 length of latter 8*5 ; width of vesicle 3'2, of brachium 3, of 

 hand 3*5 ; lengtli of hand-back 5, of movable digit 9. 



Lac. Cachavi, Ecuador [Rosenberg coll.). 



Judged by the table of species of Tityus of the so-called 

 americanus-iy)^Q that 1 published last year (Ann. & Mag. 

 Nat. Hist. (6) xix. pp. 516-517), this new form will fall 

 under heading ¥ of the section devoted to the males alongside 

 of metuendus, Poc, which it approaches in dimensions of 

 tail-segments. But the secondary sexual characters are much 

 less strongly pronounced, the tail being less incrassate, the 

 chelge shortei", the hand narrower, and the digits adjacent. 

 Moreover, in the tail the intercarinal spaces are much 

 smoother, the keels stronger and marked with fewer larger 

 granules, the median lateral keel being complete, though 

 anteriorly weak upon the second segment, while in metuendus 

 it is merely represented by a few posterior granules. 



Tityus Rosenbergi, sp. n. (Fig. 2, p. 419.) 



f^ . — Colour a uniform black, pectines and tips of digits 

 flavous. 



Upper and lower sides of trunk carinate and granular, 

 almost as iu T. Cambridgei. 



Tail with its keels and intercarinal spaces much less 

 coarsely granular than in T. Cambridgei^ of medium length, 

 slender, a little narrowed posteriorly, width of fourth segment 

 a little less than half its length (3:7); fifth segment a little 

 longer than carapace ; vesicle a little narrower than brachium 

 and slightly wider than hand ; tooth not close to aculeus. 



Chelce long and slender ; hand narrower than brachium, 

 strongly keeled, the keels finely granular ; digits very long, 



31* 



