Scorpions from Central and South America. 387 



Measurements in millimetres. — ? . Total length 72, cara- 

 pace 7-2, tail 42. ^ . Total length 67, carapace 6, tail 43. 

 Loc. Yucatan {in Keyserling^s coll.). 



Centrums nigrovariatus^ sp. n. 



^ . Allied to Cinfamatus of 0. Koch in colour and most 

 structural features, but differing in the formation of the 

 posterior segments of the tail, the fifth segment being wider 

 than the first, with its upper surface much elevated in the 

 middle, with a deep median groove expanding posteriorly into 

 an oval depression. 



Measurements in millimetres. — Total length 52, carapace 

 4'5, tail 33, width of its first segment 23, of its fifth 2'7, 

 height of latter 2*5. 



Loc. Oaxaca, Mexico. 



Centrurus Jlavopictus, sp. n. 



Colour reddish or brownish black, with a narrow median 

 dorsal yellow stripe on the tcrgites, and a yellow spot on the 

 posterior angle ; tail reddish brown, darker beneath and 

 posteriorly, vesicle red ; humerus and brachium of chelae 

 blackish red, the trochanter and hand clear yellowish red, 

 digits black, with distal third pale reddish ; legs entirely 

 yellow, mandibles infuscate distally. 



External finger-keel of hand nearly obsolete, internal 

 granular ; eight rows of teetli on digit. 



Pectinal teeth 22 {^ ? ). 



Measurements in millimetres. — $ . Total length 62, tail 37, 

 carapace 6*7 ; width of hand and brachium 2'5, movable digit 

 7'5. c?. Total length 69; length of tail 46, of carapace 7 ; 

 width of hand 3'3_, of brachium 2*5, length of finger 8. 



Loc. Jalapa in Mexico. 



Centrurus limbatus, sp. n. 



(J . — Allied to C. (jracilisj but strikingly different in colour 

 as well as in some structural featui'es. Carapace and tergites 

 yellow or reddish, narrowly margined with black; ocular 

 tubercle black ; tail also yellow, with its fifth segment and 

 vesicle uniformly brown or black; keels spotted black, 

 especially those on the lo\^'er side of the segments; legs 

 entirely pale yellow ; palpi also pale yellow, digits quite 

 black with reddish tips ; mandibles distally infuscate. 



Nine rows of teeth on the digits. 



Pectinal teeth 25. 



