BTTHUS. 13 1 



a'-. Abdominal terga with three crests ; all 



the caudal segments keeled. 

 a 3 . Immovable finger of mandible with 

 two teeth below ; carapace with con- 

 spicuous keels ; not variegated BUTHUS, p. 13. 



b 3 . Immovable finger of mandible with 

 only one tooth below ; carapace with- 

 out keels; variegated yellow and 



black HKMIBUTHUS, p. 34. 



b'-. Abdominal terga with only one median 



keel ; tail scarcely keeled. 

 a*. Sternum pentagonal; median rows of 

 teeth on fingers of chelae scarcely 

 overlapping ; trunk and tail thickly 



granular ". CHAHMUS, p. 31. 



b 1 . Sternum triangular; median rows of 

 teeth on fingers of chela? largely 

 overlapping ; tail and body smooth, 

 polished, scarcely granular ' STENOCHIRUS, p. 32 1 



A. 



Genus BUTHUS, Leach. 



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

 quent authors except 0. Koch). 



Androctonus + Liurus + Prionurus, Hempr. Sf Ehr. Symb. Phys. r 

 Scorpiones, pp. 3-5, 1829. 



Androctonus, Thorell, A. M. N. H. (4) xvii, p. 7, 1876 ; Kraepelin, 

 Jb. Hamb. wiss. Anst. viii, p. 173, 1891. 



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

 1890, p. 126. 



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 



I -^ and a longer posterior pair behind 



** I x ii /*._ / . , 'iij.111 



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 



g- 7. A. Diagram of cara- o f ]arge teeth, and an inner of single 



pace ot Buthus. a anterior t th t j adyance o f those of the 



m, median, p, posterior, I, 



lateral keel; .r, lateral, and outer senes. 



Type, B. occitanws, Amor., S.Europe, 



0. 



g, median eyes. 



B. Abdominal tergum of same. 

 h, median, k, lateral keel 



operculum of same. 



Distribution. Mediterranean area of 

 "* Kegion ; China , Ethiopian 

 Eegion down to Zambesi ; India, but 

 absent from Ceylon and Burma. 



