Pedipalpi from the Lower Amazons. 365 



Sterna entirely smooth and polished ; a few large punc- 

 tures here and there. 



Ihil a little more than three times as long as carapace, 

 posteriorly narrowed ; lower surfaces of segments 1-3 smooth, 

 polished, keelless, but furnished with long bristles ; the supe- 

 rior and superior lateral keel distinct and weakly granular, 

 terminating on the second segment in an angular tooth ; fourth 

 segment like the third, but sparsely granular below, upperside 

 of these segments sparsely granular; upperside of fifth 

 without granules except on the side margins ; the sides 

 granular, the lower surface coarsely but not closely granular, 

 lateral keels granular ; vesicle coarsely granular below, 

 hairy, smooth at base of aculeus. 



Chela with humerus granular above on its anterior and 

 posterior keel; brachium smooth, not kejeled, hairy; hand 

 smooth, polished and punctured above except towards the 

 inner edge and the base of the immovable digit, where there 

 is coarse granulation, the inner edge with a distinct basal 

 tooth ; hand-back and lower surface quite smooth, immovable 

 digit stout, punctured, rugose. 



Le()s smooth except for the femora of third and fourth, 

 which are finely granular externally. 



Pectinal teeth 6-7. 



(J. — Like the female, but with the carapace, terga, the sides 

 of the caudal segment, including also the lower surface of the 

 third and fourth, and the lateral portions of the sterna finely 

 sha2;reened with sianules. 



Pectines larger, 8-9 teeth, in which the sensory area e.\;tends 

 up to the base; upper surface of hand not so smooth as in 

 the female, but only very finely shagreened externally. 



lileasurements in millimetrfs. — $ . Total length 27 ; length 

 of carapace 3*5, of tail 13, width of its first segment 2. 



^ . Total length 24 ; length of carapace 3-5, ot tail 13'8. 



Loc. Santarem. Several specimens taken in the forest 

 beneath rotten wood by Mr. Cambridge. 



The three known species of this genus may be recognized 

 by the following table : — 



Female. 



«. Carapace and terga and external surfixces of fe- 

 mora of legs smooth, without granules ; hand 

 and brachium also almost entirely smooth, as 

 well as the side;? of the fifth caudal seg-raent. . Gollmeri (Karscli) 



( = n itidus, I'oc. ) . ( Ve- 

 nezuela and Trinidad.) 

 h. Carapace, external surface of femora of third 

 and fourth legs, sides of fifth caudal segment, 



