— 8 — 



is furnished witli a pair of respiratory stigmata; the last 

 sternite usually only Mith four keels. 



A synoptical table of families, genera and species of scorpions. 



The scorpions of British East Africa are referable to 2 

 families, 9 genera and about 17 species, the characters of 

 which may be tabulated as follows: 



A. Sternum triangular, narrowed in front; legs furnished 

 with a pair of tarsal spines, one in front and one behind; 

 hands of the palpi slender and rounded— fam. Buthidae. 

 a. 3rd and 4th legs furnished with spurs, 

 ai. No triangular tooth (or only a small tubercle) beneath 

 the aculeus on the vesicle; immovable finger of mandible 

 Avith two teeth below. 



Sio. Carapace of the cephalothorax not crested; tergites 

 furnished with only one median keel: no small tuber- 

 cle beneath the aculeus on the vesicle. 

 a3. Tail posteriorly very distinctly incrassate; inferior 

 keels of l — 3rd caudal segments forming on each 

 segment a pair of posteriorly con-verging ridges; 

 movable digit of palpi furnished witli ll —12 exter- 

 nal granules; pectinal teeth 27-28 (?) or 33—34 



(^) PnrabiifJius palfidus Poc. 



ba.- Tail posteriorly slightly incrassate; inferior keels 

 of 1—3 rd caudal segments nearly parallel; movable 

 digit of palpi furnished with J3— 14 external gra- 

 nules; pectinal teeth ::i2-33 (?) or 39—47 (d') . . 



Pnrabuthus liosoma (W. et. Elir.). 



b2. Carapace of the cephalothorax distinctly crested; ter- 

 gites furnished with three (one median and two late- 

 ral) keels; a small tubercle beneath the aculeus on the 

 vesicle (or only geniculate). 



a^. „Less coarsely granular; tail thinner and lower 

 height of 4th segment barely half its own length 

 nnd distinctly less than length of 1st; upper sur- 

 face of caudal segments much less strongly exca- 

 vated"; superciliar crest of the ocular tubercle gra- 

 nular Bufhiis polystictns Poc. 



b.,. „AIore coarsely granular: tail thicker, its superior 

 keels more strongly elevated; height of 4th segment 

 more than half its length and equal to length of 



