Classijication of Scorpions. 9 



** Both the inner and outer lateral teeth of the palp-fiuger3 

 arranged in a number of short oblique rows, with at least 

 three teeth in each row. 



1 . The fifth caudal j oint broadly excavated above, its upper margins 



forming an elevated keel. (The tail gradually broader from 



its base towards the fifth joint.) Rhopalurus, n.' 



Type R. laticauda, n.'^ 



2. The upper margins of the fifth caudal joint rounded, not form- 



ing an elevated keel. . Centrurus, (Henipr. et Ehr.), 18!29^. 

 Type C. biaculeahis, (Lucas), 1839. 



Fam. II. Telegonoidse. 

 Sternum very short, forming a transverse falciform band or 

 line cm-ved backwards between the coxfB of the second pair 

 and the genital plates. The intermediate lamellee of the 

 combs generally (always ?) numerous, most of them rounded 

 and small (little or not larger than the fulcra), and arranged 

 in 1-3 longitudinal rows. Both fingers of the mandibles 

 provided with a single row of teeth. Lateral eyes three or 

 two (?) on each side, small. No tooth or spine under the sting. 



A. Tail without keels on the underside. 



1. The fifth caudal joint provided on the underside, near the apex, with 

 a lai'ge, depressed, almost semielliptical area, roimded in front, and 

 limited by a row of small teeth or gi'anules. 



BoTHRiuRus, (Pet.), 186P. 

 Type B. vittatus, (Guer.), 1830. 



^ poiraKov, club ; olpa, tail. 

 * Rhopalurus laticauda, n. 



Subtestaceus, cauda a basi ad segmentum quintum dilatata, tum fortiter 

 angustata, apice late infuscata, manibus subtiliter granulosis, plus 

 minus evidenter costatis, brachio circiter dimidio latioribus, digito 

 manuum mobili manu postica pauUo plus dimidio longiore, ordinibus 

 denticulorum secundum mediam aciem circa 8 ; dentibus pectinuni fere 

 19-23. Long, circa 44—50 millini. America merid., Columbia. 



^ Hemprich and Ehrenl^erg formed the genus Centrurus for those 

 scorpions which had " 10 eyes," without giving any species as its type. 

 Peters says {I. c. p. 508) that it is founded on a Brazilian species, and 

 that there can be no doubt of that species belonging to the genus Titijus 

 of 0. L. Koch. I have therefore as type of the genus taken a species, 

 C. biaculeafus, (Luc), which Peters expressly names as belonging to 

 Centrurus, Ilempr. et Ehr. In this genus the eyes do not appear to 

 me to be in" general more than 8 ; but there certainly are species with 10 

 (for instance, C testaccus, (l)eGeer), which has an accessory eye either on 

 both sides or only on one of the sides), and even with 12 eyes. It is 

 therefore impossible to take tlie number of ej^es into account in charac- 

 terizing this genus. 



■^ I have altered the characteristics of Peters's genus Bothriurus so as 

 to make it also comprehend Brotheas erythrodactj/lus, C. L. Koch, which 

 probably is the female of B. honariensix, ejusd. ; Scorpio vittatus, Gu^r., is, 

 I believe, the same species. 



