400 ME. R. I. POCOCK ON THE 



well developed on the four anterior segments, shining but 

 obsoletely crenulate ; the superior keels represented by a single 

 posterior tubercle on the first segment, visible on the others and 

 obsoletely tuberculate or crenulate, the upper angles of the fifth 

 not sharp but squared ; the lateral and inferior surfaces of the 

 first three segments smooth and polished, sparsely hairy, not 

 keeled ; of the fourth obsoletely keeled and granular, the lower 

 surface of the fifth somewhat coarsely but irregularly granular, 

 its posterior border denticulate. Vesicle piriform, coriaceous 

 beneath, smooth and flat above, the aculeus stout at the base, 

 somewhat strongly but evenly curved in its distal half. 



Falpi robust ; humerus with its keels weak but granular, its 

 anterior surface flat, weakly granular ; hrachium smooth, obsoletely 

 custate ; manus large, convex above, its inner portion produced, 

 smooth, obscurely and very feebly granular towards its inner 

 edge, and very obscurely costate above, its width about equal to 

 the length of the "hand-back," which is furnished with an oblique 

 row of four pilif erous pores. Digits short, curved, in contact, the 

 movable a little longer than the length of the " hand-back," the 

 immovable furnished with . five piliferous pores ; four more of 

 these pores in a line on the external surface of the hand, lying 

 between the bases of the two digits. 



Legs smooth, except the inferior edge of the anterior two 

 femora, which are granular ; the distal tarsal segment with two 

 rows of hairs beneath. 



Pectines short, furnished with 7 teeth (one specimen with 8). 



S . Slenderer than female, the tail longer, being about 4|^ 

 times the length of the carapace. The upper surface of the 

 hand very finely granular. Pectiiies larger, the teeth much 

 longer, 8 in number. 



Measurements in millims. — 5 • Total length 38, of carapace 5, 

 of tail 20 ; width of 1st caudal segment 3, length 2 ; length of 

 4th segment 3, width 2'5 ; length of 5th 5"5, width 2*5 ; length 

 of palp 15'5 ; width of brachium 1-8, of manus 4, of " hand-back " 

 38, of movable digit 4'5. 



S . Total length 31, of carapace 4, of tail 19. 



Locality. Trinidad (JV. E. Broadway and J. H. Hart). 



This species is very nearly related to Ghactas Gollmeri, Karsch, 

 from Caraccas, which probably also belongs to the same genus. 

 Karsch, however, makes no mention of the presence of keels and 

 granules upon the lower surface of the 4th caudal segment. Nor 



