Scorpions from Central and South America. 389 



Centrurus 7-ubricauda, sp. n. 



^ . — Colour almost a uniform reddish black all over ; the 

 hands redder than the rest of the chelte ; tarsi and pectines 

 yellow ; tail reddish ochre-brown. Granular crests on hand 

 evident and finely granular ; crests on tail rather coarsely 

 granular, but the gr a aides few in number and more spaced 

 than in allied forms ; on tlie infero-lateral keel of the third 

 segment, for example, the granules are fewer than twenty 

 (15-19); vesicle granular; the spine not close up to tlie 

 acnleus. Sterna 2-4 smooth, punctured, especially number 3. 



Pectinal teeth 20-21. 



^._Differing from the female in the normal sexual 

 features, but in addition with the legs bright yellow ; crests 

 on hand scarcely perceptible ; crest on tail weakly and 

 sparsely granular as in female ; vesicle parallel-sided when 

 viewed from below, bulging on each side at right angles at 

 the base of the aculeus. 



Pectinal teeth 21-23. 



Measurements in millimetres. — ? . Total length 80 ; length 

 of carapace 8-5, of tail 51. S • Total length 103 ; length of 

 carapace 9, of tail 71. ^ 



Loc. Managua in Costa Rica {Dr. Rothschuh). lour 

 male and four female specimens. 



Centrurus nigrescens, sp. n. 



5 , — Colour a uniform blackish green ; tarsi and distal half 

 of fingers ferruginous ; pectines fiavous ; coxre and sternal 

 areas mesially ochraceous. Coarsely and thickly granular ; 

 middle finger-keel or hand strong, all the crests on the tail 

 strongly granular ; vesicle weakly granular ; the spine close 

 up to the base of the vesicle. 



Pectinal teeth 25-27. 



^ . — Like female in colour. Inferior crests on fifth caudal 

 segment distinct and granular ; vesicle about twice as long 

 as wide, almost smooth, its shoulders not very strongly ex- 

 panded. 



Pectinal teeth 28-30. 



Measurements in millimetres. — ? . Total length 89, of 

 carapace 9, of tail 53-5. S- Total length 105, carapace 9, 

 tail 73. 



Loc. Xantipu (5500 feet alt.) (type) ; also Amula and 



Orizaba. 



In colouring the female of this species resembles that of 

 rubricauda, except that the reddish tint upon the palpi and 



