Mr. R. I. Pocock on South-African Scorpions. 379 



tricolor, Sim., for although all these forms were referred to 

 Lej^reus, their dentition maj be of the type presented by 

 planimanus, or by vittatus, or by occidentalis. And, lastly, 

 since all these forms inhabit a single geograjjhical area, it is 

 in the highest degree probable that when the described forms 

 have been re-examined and others discovered still more inter- 

 mediate links than now exist will be found between the various 

 types of dental formula. Prof. Kraepelin has, however, 

 attempted to maintain the genera Lepreus and Uroplectes on 

 other grounds (Jahrb. Hamb. Anstalten, xii. p. 7, 1895), 

 referring to the former the two species ^^Yasws and />/a/ii/?i'Z/i?«s, 

 in which there are small lateral keels on the terga, a long 

 basal pectinal tooth in the female, and no tooth beneath the 

 aculeus on the poison- vesicle; and to the latter the species in 

 which there is only one crest on the terga, the basal pectinal 

 tooth is not elongate, and there is a tooth beneath the aculeus. 

 But as regards the armature of the vesicle, it may be said that 

 variegntus of Koch, which resembles pilosus and planimanus 

 in having the lateral tergal crests, has a large tooth on the 

 aculeus ; and concerning the structure of the basal pectinal 

 tooth in the female, it may be added that in the female of 

 U. triangulifer and of U. Marshalli this tooth is unmodified, 

 and that in variegatus it is also of the same form as in linea- 

 tuSj and is not elongate as in pilosus and pla7iiman us ; so that 

 this feature cannot at present be looked upon as of generic 

 importance. And, finally, I doubt if the genus Lepreus can 

 be maintained on the presence of the lateral tergal keels ; such 

 keels, at all events, are not accorded this importance in the 

 case of Archisometrus tricarinatus and Buthus quinque- 

 striatus. 



Uroplectes planimanus (Karsch) . 



Lejpreus planimanus, Karsch, Mittli. Miincla. ent. Ver. 1879, p. 125 ; 

 Ki-aepelin, Jahrb. Hamb. Wissen. Anst. viii. p. 94, pi. ii. tig. 24 

 (1891). 



The British Museum has recently received three adult 

 examples (two males, one female) of this species from the 

 Umfuli River, 4200 feet, in Mashunaland {G. A. K. Mar- 

 shall). The male ditFers from the female in having the tail 

 much longer (carapace 4 millim., tail 29 millim.), whereas in 

 the female a specimen with carapace 4*3 millim. has the tail 

 only 22 millim. 



27* 



