CH.ERILUS. 



55- 



humerus, brachium, and under- 

 hand all exceeding length of cara- 

 pace ; humerus more than twice as 

 long as wide : width of hand less 

 than half the length of the under- 

 hand ; terga smooth C. insignis <$ , p. 58. 



b 4 . Width of 1st caudal segment equal 

 to length of 4th, 2nd wider than 

 long ; humerus shorter than bra- 

 chium, and underhand equal to 

 length of carapace ; width of hand 

 always more than half the length 

 of underhand. 



a 5 . Terga smooth, only obsoletely 

 granular ; frontal area of cara- 

 pace weakly granular anteri- 

 orly ; inferior median keels of 

 2nd caudal segment granular . . C. margaritatus < , 

 b'\ Terga very distinctly and closely [p. 58, 



granular" throughout, frontal 

 area of carapace coarsely gran- 

 ular anteriorly ; inferior median 

 keel of 2nd caudal segment 



smooth C. anihracinus $ , 



b 3 . Chelae short ; humerus, brachium, [p. 57, 



and underhand considerably shorter 

 than carapace ; pectines small, 

 length from base of shaft to tip of 

 apical tooth much less than patella 

 of 3rd leg. 



a 6 . Abdominal terga so densely and 

 uniformly covered throughout 

 with granules that no visible inter- 

 spaces are left ; trunk and chelae 

 blackish, legs yellowish brown . . C. anthracinm 2, 

 b''. Abdominal terga studded with [p. 57, 



pearl-like granules separated by . 

 very distinct interspaces ; body 

 and chelae dull brown. 

 a 7 . Frontal area of carapace weakly 

 granular throughout, the gran- 

 ules at most only a little 

 coarser anteriorly ; hand wider, 

 its width about equal to length 

 of humerus ; trunk and limbs 



uniformly coloured C. margaritatus 2 , 



b~. Frontal area of carapace smooth [p. 58, 



behind, coarsely granular an- 

 teriorly; hand narrower, its 

 width noticeably less than 

 length of humerus ; trunk and 



limbs variegated C. granosus, p. 56. 



'. Vesicle much less inflated, flatter 

 beneath, as high as 5th caudal seg- 

 ment, and, when viewed from the side, 

 passing gradually and without constric- 

 tion into the aculeus ; aculeus less 



