46 E. LÖNNBERG. PATAUONIAN SCORPIONS. 



only once, 17 in some, but 18 and 19 is more common even 

 in the smallest speeimens from both localities. According to 

 Kr.epelin the nnmber of comb-teeth can vary from 13 to 17, 

 the last nnmber being an exception. 



Thus it does not seem impossible that the speeimens 

 brought home by the Swedish expedition represent a geogra- 

 phieal race or variety with a more sonthern distribution 

 characterized by better developed candal keels and a larger 

 nnmber of comb-teeth. However as there are no greater diffe- 

 rences, I do not want to introduce any new name. The home 

 of the typical Urophonins brachycentrns is sonth-western 

 Brazil, Uruguay and Argentine, but how far it ranges south 



1 do not know. 



The colour of the sonthern type does not seem to offer 

 any distinctive characteristics and even the youngs show 

 about the same pattern of colouration although a little lighter 

 of course. The grown speeimens measure about 3 cm. 



Bothriurus burmeisteri (Kr.epelin). 



2 (o", $) speeimens ( 6 /n 95) Puerto Madryn sandy places, not 



rare, under stones and düng etc.» 



The speeimens agree with Kr^epelin's description (1. c. p. 

 227 — 28). His speeimens were also from the Argentine republic. 



Bracliiosternus alienus n. sp. 



1 speeimen ( 6 /n 95) Puerto Madryn »sandy places» etc. together 

 with Bothriurus burmeisteri. 



There is only one speeimen of this kind, but as it differs 

 from B. ehrenbergi (G-erv) according to Kr^epelin's descrip- 

 tion (1. c. p. 216—18) almost in every respect neither is de- 

 scribed later 1 do not hesitate to regard it as representing a 

 new speeies. whieh can be described as follows. The colour 

 of the upper surface is dirty yellow, but on both sides of 

 each abdominal segment is a large brown spot which however 

 leaves the hindmargin free (conf. B. ehrenb. »dunkle Hand- 

 linien am Hinterrande der Segmente*). The cauda is unspotted, 

 rusty yellow. The legs are yellow with a rather well defined 



