THE GBAPSOID CBABS OF AMEBICA. 405 



Merus of large cheliped of male marked with very fine granulated 

 rugae. Carpus and palm coarsely granulate, the granules continued 

 on the fingers, becoming very fine towai'd the tips; granulation 

 coarser on the upper part of the chela than on the lower. Besides the 

 sulcus following the lower margin of the palm there is another very 

 short longitudinal sulcus at the distal end of the palm, and opposite 

 the middle of the poliex. 



The oblique, tuberculate ridge leading up from the lower margin 

 of the inner surface is continued in a zigzag line to upper margin, 

 surface distal to it granulate. Fingers about as long as palm, nar- 

 rowly gaping ; prehensible tubercles coarse, a larger one at middle of 

 poliex. 



Measurements. — Male (19441), length 8, width 11.5 mm. 



Habits. — Extremely abundant in the mud of the mangroves. In 

 some places it is quite impossible to walk along without hurting many 

 of them. In the stomach of a kind of owl {Ciccaha nigroUneata 

 Sclater) I found many carapaces of the little species. (Note by J. F. 

 Tristan.) 



Range. — Mexico to Chile. 



Material examined. — 



Guaymas, Mexico; Capt. C. P. Stone; 1 male without large che- 

 Uped (M. C. Z.). 



Corinto, Nicaragua; J. A. McNiel; 2 males, 1 female (M.C.Z.). 



Boca del Rio Jesus Maria, Costa Eica; April, 1905; J. F. Tristan; 

 4 males, 3 females (32320). 



Santo Domingo, Gulf of Dulce, Costa Rica; April, 1896; H. Pit- 

 tier; 2 males, 3 females (19441). 



Chile; 2 males, cotypes (Paris Mus.). 



Additional records. — Colombia : Tumaco (Nobili ) . Ecuador : Pun- 

 tilla di S. Elena (Nobili). 



UCA RECTILATUS (I.ockington). 



Gclasimus reetilatus Lockington, Proc. California Acad. Sci., vol. 7, 1S7G 



(1877), p. 148 (type-locality, west coast of Lower California; type not 



extant, Cat. No. 3112, California Acad. Sci.). 

 Gelasimns annuHpcs Kingsley, Proc. Acad. Nat. Sci. Philadelphia, ISSO, 



p. 148 (part). (Not Milne Edwards.) 

 Uca rectilata Holmes, Occas. Papers California Acad. Sci.. vol. 7, 1900, 



p. 7G, pi. 1, figs. 10-14. 



Diagnosis. — Side margins strongly convergent and almost straight 

 lines. Front narrow. 



Description. — Carapace wide, nearly flat transversely, but longi- 

 tudinally strongly convex. Front about one-sixth width of carapace, 

 arched strongly forward. Upper edge of eyebrow much curved, 



