-50 BUTHID,!. 



intercarinal spaces scarcely granular ; keels evenly granular ; 

 vesicle with spine not acute, wide at the base, its free edge semi- 

 circularly rounded, armed in front with four small denticles, close 

 to aculeus, the intervening distance less than half the thickness of 

 the base of the aculeus ; aculeus very short, barely half the length of 

 the vesicle. Chelce weakly granular ; brachiutn armed in front 

 with some half-dozen tooth-like tubercles ; hand keeled, distinctly 

 wider than brachium, width more than half the underhand ; the 

 latter nearly as long as the movable digit, which is about equal 

 to the carapace and furnished with 6 rows of teeth. Tarsi 

 furnished beneath with two rows of hairs. Pectinal teeth 13-14. 



c? . Tail very long, more than six times the length of the carapace, 

 which is equal to its 2nd segment ; 1st segment about twice, 4th 

 about three times as long as wide ; keels and intercarinal spaces 

 smoother than in $ , superior keels of 2nd and 3rd segments each 

 ending in a triangular tooth ; chelae with hand smoother and a little 

 thicker and longer than in $ , the length of the underhand being 

 equal to that of the movable finger. 



Measurements in mm. $ . Total length 40, carapace 4*5, tail 23. 

 3 . Total length 56, carapace 5, tail 38. 



Loc. Ceylon : Peradeniya (Sarasin), Haldumullah (Green). 



37. Isometrus brachycentrus, Pocock, Jour. Bom. N. H. Soc. xii, 



p. 263, 1899. 



$ . Nearly allied to the preceding, but much darker in colour. 

 Upper side of trunk deep blackish brown, anteocular area of 

 carapace black ; terga with a clear circular spot on each side of 

 the middle line, also a paler lateral submarginal band ; tail reddish 

 brown, the median inferior intercarinal space marked with a black 

 stripe ; oth segment, with exception of its anterior part, entirely 

 black ; chelae mostly a uniform reddish brown or clearer reddish 

 yellow ; legs strongly infuscate externally, the femur and patella of 

 the posterior legs being almost wholly black with only one or two 

 yellow spots ; abdominal sterna, except the 5th, not infuscate. 

 Structurally almost as in I. basilicus, but the tail thinner, about 

 six times as long as the carapace, the 1st segment longer than wide, 

 the 4th a little more than twice as long as wide. Chelce also as in 

 /. basilicus, but hand a little smaller, scarcely exceeding brachium 

 in width. Pectinal teeth 12. 



Measurements in mm. Total length 42, carapace 4, tail 24. 



Loc. Mangalore (Battie) and Kanara (Bell), on the Malabar coast. 



38. Isometrus vittatus, sp. n. 



2 . Colour : carapace varied with yellow and brown ; upper side 

 of abdomen with two complete yellow bands, separated from each 

 other by a complete median brown band about equal to them in 

 width, and from the external margin by a similar brown band ; sterna 

 pale ; tail uniformly yellowish brown, a little darker posteriorly ; 

 chelae with humerus and hand pale ; brachium, except for its pale 



