IH THUS. 



IS 



or. Abdominal terga with three crests; all 

 the caudal segments keeled. 

 a a . Immovable finger of mandible with 

 two teeth below ; carapace with con- 

 spicuous keels ; not variegated BuTHUS, p. 13. 



h'. Immovable finger of mandible with 

 only one tooth below ; carapace with- 

 out keels ; variegated yellow and 



black Hemibuthtts, p. 34. 



Ir. Abdominal terga with only one median 



keel ; tail scarcely keeled. 



a 1 . Sternum pentagonal: median rows of 



teeth on fingers of chela? scarcely 



overlapping ; trunk and tail thickly 



granular Charm rs. p. :;1 . 



/>'. Sternum triangular; median rows of 

 teeth on fingers of chela- largely 

 overlapping ; tail and body smooth, 

 polished, scarcely granular Stenochirus, p. -*52 



A. 



Genus BUTHUS, Leach. 



Buthus, Leach, Tr. Linn. Soc. xi, p. 391, 1815 (and of most subse- 

 quent authors except 0. Koch). 



Androctonus -\- Liurns 4- Prionurus, Hempr. $■ JEhr. Symb. Phys., 

 Scorpiones, pp. 3-5, 1829. 



Androctonus, Thorett, A. M. N. H. (4) xvii, p. 7, 1870 : Kraepelin, 

 J/>. Haml>. wiss. Anst . viii, p. 173, 1891. 



Prionurus, Peters, MB. Akad. Berlin, 1861, p. 513 ; Pocock, P. Z. s. 

 1890, p. 120. 



Two teeth on the under edge of the 

 immovable mandibular finger. Terga 

 with a median and two lateral gran- 

 ular keels. Carapace with strong 

 keels (at least in all the Indian 

 species), an anterior pair in front of 

 the ocular tubercle, a shorter median 

 and a longer posterior pair behind 

 it, also a single lateral keel on each 

 side. Tail keeled; no spine beneath 

 aculeus. Sternum triangular, not 

 shorter than the genital operculum. 

 Armature of digit of chela consisting 

 of numerous median rows of teeth, 

 an outer series consisting of couplets 

 Fig. 7.— A. Diagram of cara- f ] al . ge teeth, and an inner of single 



teeth, set in advance of those of the 

 outer series. 



Type, B. occitanw, Amor.,S. Europe, 

 &c." 



Distribution. Mediterranean area of 

 Palsearctic Region ; China; Ethiopian 

 Kegion down to Zambesi ; India, but 

 absent from Ceylon and Burma. 



B. 



in, median, p, posterior, /. 

 lateral keel; x, lateral, anil 

 z, median eyes. 



B. Abdominal tergum of same. 

 h, median, /«•, lateral keel. 



C. Triangular sternum (,s) of ce- 

 phalothorax, and (g) genital 

 operculum of same. 



