1890. J OF THK FAMILY BUTHID^. 127 



since this species is also the type of Leiurus it follows that Leiurus, 

 the subgenus, must give place to Androctonus. 13ut eurupceus, the 

 tyi)e of Buthus, is recognized as synonymous with tunetanus, and 

 Buthus antedates Androctonus by 14 years : therefore Androclonus 

 must be a synonym of Buthus. Prionurus can then be used to 

 include those powerful-tailed species of which australis is the type 

 — ^that is, in the sense in which Ehrenberg presumably meant it to 

 be used, and in the sense in which Peters himself employed it. 



Synopsis of the Buthidae. 



a. The inferior border of the immovable digit of 

 the cheliceras unanned. 

 «'. The lateral -internal series of denticles on the 

 digits of the chelse composed of transversely 



set pairs of teeth Uroplectes, Peters. 



Type U. ontatun, Peters, 

 i'. The lateral-internal series of denticles on the 

 digits of the chelaj composed of a row of 



teeth vridely separated and set singly Lepreus, Thor. 



Type L. pUusiui, Thor. 

 h. The inferior border of the immovable digit of 

 the cheliceras armed with one tooth. 

 a'. The intervals between the main teeth of the 

 lateral series on the digits of the chela not 

 occupied by smaller teeth. 

 a?. Ante-ocular portion of cephalotliorax 

 horizontal, with lightly emarginate 

 anterior border. 

 «'. With a spine or tubercle beneath the 

 aculeus ; fifth caudal segment not 

 coarsely punctured, and normally keeled 



beneath Isometkus (Ehrb.), Thordl. 



Type maculatus (De Geer). 

 6*. Without a spine or tubercle beneath 

 tlie aculeus ; fifth caudal segment not 

 keeled beneath and adorned with large 



punctures Isometroides, Keys. 



Type /. vescus (Karsch). 

 b^. Ante-ocular portion of cephalothorax 

 sloped forwards, with its anterior margin 



convex; tail very powerful Butheolu.s, Simon. 



Type B. thalassinus, Simon. 

 h-. The intervals between the main teeth of the 

 lateral series on the digits of the chelae 

 occupied by a single row of smaller teeth ; 



the rest as in Isometrns Centkurus (Ehrb.), Peters. 



Type C. gracilis (Latr.). 

 c. The inferior border of the immovable digit of 



the chelicera) armed with two teeth Buthus, Leach. 



Type IS. atropmus (Linn.). 



£■'. Tergites with a single median longitudinal 



keel; cephalothorax without distinct keels. 



c^. All the pectinal teeth alike in both sexes ; 



tail moderate or powerful ; the segments 



moderately strongly keeled ; a distinct 



spine beneath the aculeus Subgenus Eiioi'THURUS, Karsch. 



Type E. dcntatus, Karich. 

 d-. The basal pectinal tooth dilated in the 

 female ; tail moderate, not strongly keeled ; 



10* 



