390 Mr. R,. I. Pocock on new 



tail of the latter is not noticeable. But the granulation of 

 the carapace is much closer, the interstices between the series 

 of larger granules being filled in with fine granules, and the 

 crests on the tail much more numerously granular, there 

 being about 35 granules on the infero-lateral crest of the 

 third segment ; lastly, the spine is much closer to the base of 

 the aculeus. 



Centrums fulvipeSf sp. n. 



$ . — Apparently differing from nigrescens only in colour, 

 the humerus of the palp and the entire legs being a clear 

 reddish yellow, also the basal segments of the tail reddish 

 brown above. Spine on vesicle as in nigrescens ^ close to 

 base of aculeus. 



Pectinal teeth 28-29. 



Loc. Xantipu in Mexico. 



Family Scorpionidae. 



Genus DiPLOCENTRUS, Pet. 



Diplocentrus rectimanuSj sp. n. 



Differing from the male of Whitei in the characters pointed 

 out in the annexed table of species. 



Measurements in millimetres. — Total length 55 ; length of 

 carapace 6, of tail 30 ; width of hand 5-5 ; length of movable 

 digit 7. 



Loc. Jalapa (Mexico). 



Diplocentrus politus, sp. n. 



The essential characters of this species are set forth in tlie 

 subjoined synoptical table. Colour yellowish brown. Upper- 

 side of trunk smooth and polished ; carapace granular laterally 

 and with a few granules on the frontal lobes ; tergites with a 

 few scattered granules posteriorly and laterally ; the last more 

 coarsely granular. Tail robust, with intercarinal spaces 

 smooth, the normal keels coarsely granular ; the median 

 lateral and inferior medians represented by a few granules on 

 the fourth segment ; median keel on fifth weak ; sides of these 

 segments with a few coarse granules ; vesicle granular. Cheloe 

 robust; humerus with irregular coarse granulation above, not 

 distinctly keeled, smooth behind and below ; brachium almost 

 wholly smooth, a little granular in front above; hand smooth 

 above, marked with scattered punctures, its inner edge and 



