210 



edge, and with other, generally coarser teeth, arranged in one or more 

 rows on each side of these. Three principal lateral eyes and 2-0 

 accessory eyes on each side of the cephalothorax.] 



Fam. I. Androctonoidae. 



2 (5) Not only the upper but also the under margin of the immovable 



mandibular finger armed with two strong teeth. [Lateral teeth of the 

 palp-fingers, which are coarser than the median teeth, forming along 

 the inner side a single simple row, but arranged along the outer side 

 in a series of teeth placed two and two obliquely and transversely 

 near to each other. No tooth or spine under the base of the sting. 

 Generally two accessory eyes, besides the three principal eyes, on each 

 side of the cephalothorax.] Subfam. 1. Androctoxixi. 



3 (4) The fifth joint of the tail broadly excavated above, its upper mar- 



gins forming an elevated denticulate or granulate keel . Androclonus. 



4 (3) The upper margins of the fifth joint of the tail rounded, not com- 



pressed into an elevated keel Buthus. 



5 (2) The under margin of the immovable mandibular finger has no tooth 



or only one. [Lateral teeth of the palp-fingers arranged in a single 

 row or forming several short transverse rows. The sixth joint of the 

 tail generally provided with a spine or' tooth under the sting. Acces- 

 sory lateral eyes often wanting, sometimes one or two on each side.] 



Subfam. 2. Cextrukini. 



6 (7) " Joints of the tail destitute of keels." 1 Uroplectes. 



7 (6) At least a few of the joints of the tail evidently keeled. 



8 (11) Under margin of the immovable mandibular finger toothless. 



9 (10) Lateral teeth of the palp-fingers forming on the inner side a single 



simple row, but arranged on the outer side in a row which partly con- 

 sists of teeth placed two and two transversely near to each other. 



Lepreus. 



10 (9) Lateral teeth of the palp-fingers forming, both on the inner and 

 outer side, a row of teeth placed two and two transversely near to 

 each other ........ Tilyus. 



1 1 (8) Under margin of the immovable mandibular finger armed with one 



(very small) tooth. 



12 (15) Both the inner and outer lateral teeth of the palp-fingers ar- 



ranged in a single row. 



13 (14) The fifth joint of the tail broadly excavated above, its upper 

 margins forming an elevated keel Phassus. 



14 (13) Upper margins of the fifth joint of the tail rounded, not forming 



an elevated keel Isometrus. 



15 (12) Both the inner and outer lateral teeth of the palp-fingers ar- 



ranged in a number of short oblique rows, with at least three teeth in 

 each row. 



1 Peters, the author of. the genus, has placed in it a species with " upper crests of 

 the tail distinct." Uroplectes is perhaps not different from Tit} us. 



