Scorpions from Central and South America. 387 



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

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

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



Centrurics nigrovariatuSj sp. n. 



(J. Allied to C.infamatus of C. 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 2"3, of its tifth 2'7, 

 height of latter 2*5. 



Loc. Oaxaca, Mexico. 



Centrurus jiavopictuSj sp. n. 



Colour reddish or brownish black, with a narrow median 

 dorsal yellow stripe on the tergites, 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, witli distal third pale reddish ; legs entirely 

 yellow, mandibles infuscate distally. 



External tinger-keel of hand nearly obsolete, internal 

 granular ; eight rows of teeth 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. (J. Total length 69; length of tail 46, of carapace 7; 

 width of hand o''i, of brachium 2" 5, length of finger 8. 



Loc. Jalapa in Mexico. 



Centrums limbatus, sp. n. 



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

 as well as in some structural features. 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 lower 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. 



