the Systematics of Scorpions. 377 



apparently such as is seen in the Texan examples of C. vitta- 

 tus in the British Museum. 



The species also resembles the preceding, C. Hasethi, 

 Pocock, from Curayoa, in the absence of the subaculear tooth, 

 but differs in having the crests on the hands studded with 

 pearly granulation, the smaller number of pectiual teeth, the 

 smooth and more globular vesicle, &c. 



Genus Rhopalurus, Thor. 



Rhopalurus BoreUii, sp. n. 



Heternctenus agamcmnon, Pocock, Journ. Linn. Soc, Zool. xxiv. p. 303 

 (1893). Noc Tityits n(/amemnon, C. Koch, Die Arachn. vi. p. 103, 

 tig. 506 ; and Kraepelin, Das Tierr., Scorpiones &c. p. 94 (1899) 

 ( Centrurus) . 



? . — Colour. Upperside of trunk a nearly uniform yellowish 

 brown, the frontal area of the carapace infuscate ; tail yellow, 

 with exception of the fourth and fifth segments, the latter 

 deep blackish brown throughout, the former blackish poste- 

 riorly, moi'e deeply and extensively so beneath aud laterally 

 than above ; inferior median keels of third segment sometimes 

 infuscate ; chelae with humerus and brachinm clear yellow, 

 hands strongly infuscate, but not so dark as the fingers, 

 which are black, with the extreme apex yellow ; mandibles 

 distally infuscate ; legs and sterna uniformly pale yellow. 



Carapace coarsely granular, the granules subserially 

 arranged laterally, as long as the first + ^ the second or as 

 the fifth caudal segment. 



Terga coarsely granular, without lateral crests. 

 Stei'na for the most part smooth, but the depressed area on 

 each side of the first finely and closely granular throughout 

 as far back as the stigma, the median triangular area 

 perfectly smooth and sparsely punctured, last sternum granular 

 throughout and with four granular crests. 



Tail thick and strong, more than five times as long as the 

 carapace ; fourth segment as wide as long, fourth and fifth a 

 little wider than first, the former about one fourth, the latter 

 about one third longer than wide ; upperside of tail weakly 

 granular, sides and lower surface thickly and coarsely 

 granular, especially on the posterior segments ; the keels 

 coarsely granular, the superior subdenticulate posteriorly, 

 upperside of fourth and fifth segments excavated, with up- 

 standing keels; the median lateral keel strong on the second 

 and quite distinct on the third segment, and just detectable on 

 the fourth ; vesicle weakly granular, wider than high, a little 



