472 Mr. R. I. Pocock on some neio or 



especially in its ui)pei- half; bitiiig-edj^e of iiniuovable finger 

 move than twice as long as basal width of the finger, armed on 

 its basal portion with a spiniform tooth, which fits into a 

 shallow excavation occupying nearly the basal half of the 

 movable digit and emphasized in front by a low lobe. 



Leffs with femora granular above and below anteriorly 

 (externally), smooth, except for a few granules on the femur of 

 the foiirtii. 



Pectinal teeth 7. 



Measurements in miUimetres. — Total length 68; cara- 

 pace 9 5; tail 36; width of hand 7; length of movable 

 digit ^■^. 



Loc. Rio Aniboke in Ecuador {P. 0. Simons). 



Allied to G. liosenhergi, Poc, from Ciumbo, but with the 

 legs black, the terga not finely and closely granular, the tail 

 more granular, especially on the lower surface of the third 

 segment, &c. 



Chactas lojanus, sp. n. 



$ . — Colour as in C. Bosenbergi, but with the legs darker 

 brown, although considerably paler than in C. Simon si ; 

 vesicle ferruginous. 



Carapace with anterior border more truncate than in 

 C. Rosenhergi, the frontal lobes scarcely rounded and separated 

 by a very narrow notch. 



Terga more granular than in C. Rosenhtrgi^ being mostly 

 covered with granules, which are especially fine and close-set 

 in the median impression and at the sides. 



Tail much as in C. Ilosenhergi, but more granular, the sides 

 of the first and second segments granular down to the position 

 of the inferior lateral keel, and the lower surface of the third 

 also more granular and obsoletely keeled in the middle ; 

 third caudal segment longer than wide, fifth nearly three times 

 as long as wide. 



Cheke very similar to those of C. Rosenhergi^ but smooth, 

 the fingers longer and more like those of C. Simonstj the 

 basal w idth of the immovable being less than half the length 

 of its biting-edge. 



Spines on tarsi long. 



Pectinal teeth 7. 



Male much like the female, but with upperside of trunk 

 and tail dull, being closely covered with granules, the eminence 

 on the carapace alone shining. Chelce not longer than in 

 female, but with the hand stouter. 



