420 Mr. R. I. Pocock on new 



Tail moderately robust ; the superior and supero-lateral 

 crests and area between them granular ; upper surface of 

 segments smooth in middle, granular at sides ; segments 1 to 

 3 finely granular or coriaceous laterally, smooth and keelless 

 below, the third slightly coriaceous below ; fourth distinctly 

 granular below and laterally, with the inferior lateral crest 

 traceable by a series of larger granules, upperside of fourth 

 finely granular mesially; fifth granular above, laterally, and 

 below, the three inferior crests more coarsely granular, with 

 coarser granules between; vesicle large, wider than second 

 segment, granular laterally and below. 



Chelce: humerus finely granular below, coarsely above, 

 the crests strong and granular; two infero- anterior crests; 

 brachium with a row of five posterior pores below, finely 

 granular in front, with a small inferior tubercle, rather 

 coarsely granular above and behind; hand large, its width 

 nearly equal to length of hand-back, finely granularly reticu- 

 late above, more coarsely granular externally and internally 

 and at the base of the digits ; the network of granules extends 

 on to the inner surface, and is intermixed with larger 

 granules; keel of hand- back strong, granular, area below it 

 smooth, marked in front with an oblique series of 3 pores, 

 with 2 also close to the articulation of the movable digit; 

 immovable digit with strong basal tooth fitting into an exca- 

 vation of the movable digit, which is only a little longer than 

 the hand-back. 



Legs : femora of third and fourth finely granular. 



Pectinal teeth 8-10. 



Measurements in millimetres. — Total length 65 ; length of 

 carapace 8'5, of tail 34 ; width of hand 6*8 ; length of hand- 

 back 7*5, of movable digit 8. 



Log. Chimbo, 1000 feet, near Guayaquil [Rosenberg). 



Perhaps most nearly allied to G. Whymperi, Poc, from 

 Milligalli, Ecuador (Ann. & Mag. Nat. Hist. (6) xii. p. 80, 

 pi. V. figs. 7-7 &), which it resembles in having the anterior 

 border of the carapace deeply excised in the middle with 

 prominent lateral lobes, which project in advance of the 

 anterior lateral eye, also in the granulation and crest-develop- 

 ment of the tail, and in the presence of a large tooth on the 

 immovable digit fitting into an excavation in the movable 

 digit. But Eosenbergi has much less coarsely granular cara- 

 pace and palpi, the hands of which are not nearly so noticeably 

 costate ; moreover, the vesicle is granular, not punctured as 

 in Whymperif and, lastly, the legs are yellowish brown. 



