A 5 . Hand smooth, uot granular; sterna, 



except the last, smooth ; median and 



posterior keels of carapace not forming 



a continuous unbroken crest. 



a 6 , Brachiuin of chela with two distinct 



keels on the upper side. 

 a'. Carapace and terga, except the 

 last, blackish green ; posterior end 

 of tail not darker than the rest ; 



hands yellow B. alticola, p. 21. 



b~. Median portion of terga and cara- 

 pace blackish green, lateral por- 

 tions yellow ; posterior end of 

 tail deep brown, much darker 

 than anterior portion ; hands and 



ringers, excepting their tips, black. B. nigrifrons, p. 22. 

 b e . Brachium not crested above, or fur- 

 nished merely with a Aveak crest in 

 front. 



a 8 . Tail thinner, 2nd and 3rd segments 

 usually distinctly longer than 

 wide ; total length of adult from 

 about 65 to over 80 mm. ; pectinal 

 teeth from as low as 28 ( 2 ) up 



to 39 ( d 1 ) B. tamulus, p. 23 



b s . Tail thicker, 2nd segment as broad 

 or broader than long, 3rd almost 

 as broad or broader than long: 

 total length of adult less than 60 

 mm., average about 50 ; pectinal 

 teeth from 18 ( $ ) up to 29 ( <3 ). 

 a 9 . Tail thinner ; movable finger 

 longer, as long as carapace, fur- 

 nished with 14-15 rows of teeth 

 as in tamulus; pectinal teeth 



23-24 ( $ ), 24-26 ( c? ) B. hendersoni, p. 26. 



b*. Tail thicker ; movable finger 



shorter, with 12 rows of teeth ; 



pectinal teeth 18-24. 



a 10 . Colour yellowish brown to 



blackish on body ; legs, chelae, 



and tail never dark B. rugiscutis, p. 26. 



b l . Colour black, blackish green, 

 or very deep brown on body 

 and limbs B. pachywus, p. 27. 



1. Buthus australis, Linn. Syst. Nat. ed. x, i, p. 625, 1758 (Scorpio) ; 

 Lonnbery, A. M. N. H. (7) i, pp. 87-88 (Androctonus) : priamus, 

 C. Koch, Arachn. v, p. 45, 1839 (Androctonus) : hector, id. ibid, vi, 

 p. 6, 1839 (Androctonus) : australis priamus, Pocock, Journ. Linn. 

 Soc., Zool xxv, p. 305, 1895 (Prionurus) ; Kraep. Tierr., Scvrp. 

 etc. p. 15, 1899 (Buthus). 



Loc. Algeria and Tunisia (of typical form) ; Egypt ; Syria. 



