390 Mr. R. T. Pocock on South-African Scorpions. 



b l . All the normal caudal keels at least visible, 

 the lower surface of at least the second, third, 

 and fourth segments granular, not punctured ; 

 uppersides of the fifth caudal segment convex 

 from end to end, not posteriorly elevated; 

 basal pectinal tooth in the $ (? olivaceus) not 

 enlarged. 

 a 5 . The inferior caudal crests weak, nearly ob- 

 solete, and lost arnongst the granules of the 

 lower surface ; those on the first segment 

 smooth ; the superior and superior lateral 

 keels of segments 1, 2, and 3 with terminal 

 denticle much enlarged ; vesicle in the S 

 but little modified; colour greenish, ap- 

 proaching what is seen in chlorodermus . . olivaceus, sp. n. 

 b'°. All the crests of the tail strong and well 

 defined, those on the lower surface of the 

 first segment granular ; vesicle strongly 

 compressed in its basal half, with an angu- 

 lar prominence beneath the aculeus ; pre- 

 vailing colour yellow, with two black 

 patches on the terga, each marked with a >. {triangulifer, Thor.) 

 4. Terga as in 2 and 3 ; tail almost as in a 4 , with 

 smooth unkeeled lower surface ; the fourth and 

 fifth segments and vesicle granular, superior keels 

 distinct, with enlarged terminal tooth ; hand in 

 the male enlarged, without au inner tubercle in 

 either sex ; in the distal two thirds of the digit 

 two of the teeth of the median rows are en- 

 larged and separated to form a trio with the 

 adjacent teeth of the inner set. • • 

 a 6 . The lower surface of the vesicle and of the 

 fifth caudal segment more coarsely and sparsely 

 granular ; superior keels stronger ; middle 

 keel of the terga wholly or partly black. 

 a 7 . Vesicle clear yellow ; terga marked with 

 alternating black and yellow bands. (Typical 



form.) lineatus (Koch) 



W. Vesicle fuscous, with fine yellow lines ; 

 terga darker, not distinctly banded, orna- 

 mented with well-defined X-shaped 



stripes. (Melanistic subspecies.) insignis, Poc. 



b B . The lower surface of the vesicle and of the fifth 

 caudal segments finely and closely granular ; 

 superior keels weaker ; a continuous median 

 flavous band on the terga. 

 a 8 . Chelae, with the exception of the black bands 

 and a few small fuscous spots, orange- 

 yellow ; a conspicuous spot on the base of 

 the maxilla above ; the apices of the maxil- 

 lary processes of the first and second pairs 

 of legs fuscous; last abdominal sternite 

 almost wholly black, a flavous spot in the 

 middle ; terga almost entirely smooth and 

 polished. (Typical form from Natal.) .... formosus, Poc. 

 b 9 . Hands of chelae paler, with deep black bands ; 

 brachium and humerus with large fuscous 





