SCORPIOPS. 65 



is of Indian Species. 



a. Brachium of cbela armed at base in front with 



a pair of small tubercles. 



a 1 . Upper and posterior crests upon the hand 

 and brachium very strong and smooth. 



a 2 . Upper surface of hand without a smooth 

 crest Iving longitudinally between the 

 finger-keel and the inner border and 

 ornamented with granules which fre- 

 quently run together into ridges ; length 

 of underhand exceeding width of hand, 

 especially in tf , in which the chela? are 

 elongate S. ftardwickii, p. 66. 



6 a . Upper surface of hand with a smooth 

 longitudinal crest between the finger- 

 keel and the inner border and ornamented 

 with a coarse network of perfectly 

 smooth ridges resulting from the anas- 

 tomosis of low tubercles ; width of hand 

 exceeding length of underhand, espe- 

 cially in c? , in which the chelas are not 



elongate S. insculptus, p. 68. 



b l . Upper and posterior crests upon hand and 

 brachium distinctly, often coarsely granular. 



a 3 . Length of underhand in $ about equal 

 to width of hand; keel forming inner 

 edge of upper surface of hand projecting 

 so as to conceal upper crest on inner 

 surface of hand S. crassimanus, p. 6 



i 3 . Length of underhand in both sexes much 

 greater than width of hand ; crest 

 forming inner edge of upper surface 

 weak and not projecting so as to conceal 

 upper crest on inner surface of hand . . S. leptochirus, p. 69. 



b. Brachium of chela armed in front at base with 



one or more, usually two, long sharp spini- 

 form tubercles. 



4 . Tail almost four times ( $ ) or more than 

 four times ( <f ) as long as the carapace ; 

 superior keels of segments 2-4 posteriorly 

 depressed, not spiniform ; brachial pores 7; 



vesicle, especially in <J , large petersii, p. 70. 



6 4 . Tail shorter: superior keels of segments 

 2-4 or 3-4 posteriorly spiniform and, ex- 

 cept in S. asthenurus, elevated: vesicle 

 smaller ; brachial pores not fewer than 9. 

 a 5 . Aculeus not defined at the base on each 

 side by a semicircular groove ; tail short 

 and slender, with strongly spiniform 

 superior keels ; hands and carapace 

 flatter ; width of area on hand between 

 finger-keel and inner edge not less in 

 adult $ than half the movable finger . . S. montanus, p. 70. 



F 



