THE GRAPSOID CRABS OF AMERICA. 389 



Month of the Kwilu River, West Africa: Falkenstein, collector; 

 received from Berlin Mus. ; 1 male (19557). 



UCA MINAX (LeConte). 



RED-JOINTED FIDDLER CRAP.. 



Plate 137. 



Gclasimus minax LECONTE, Proc. Acad. Nat. Sci. Philadelphia, vol. 7, 1855, 



p. 403 (type-locality, Beesley's Point, N. J. ; type in Mus. Phila. Acad. 



Sci.). 

 Grfttsinnt* palustris STIMPSON, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, 



p. 62 (part). 

 Gclasimus minax SMITH, Trans. Connecticut Acad. Arts and Sci., vol. 2, 



1870, p. 128, pi. 2, fig. 4 ; pi. 4, figs. 1-lb. 

 Uca vocator, var. minax OKTMANN, Zool. Jahrb., Syst, vol. 10, 1897, p. 353. 



Diagnosis. Oblique ridge inside hand terminating at carpal cav- 

 ity. Front very broad and shallow. Eyebrow nearly vertical. Red 

 spots at articulations of large cheliped. Hand very rough. 



Description. Carapace widest behind the antero-lateral angles; 

 greatest width less than one and one-half times greatest length. 

 Surface convex in both directions, very finely granulate, except near 

 the antero-lateral angle where it is coarsely so. H -form depression 

 shallow, a horizontal depression behind the orbit ; lateral portions of 

 the dorsal plane covered with a pubescence easily rubbed off. Front 

 considerably more than one-third the fronto-orbital width, very 

 broadly convex. Upper margin of orbit sloping strongly backward 

 with a slight sinuosity to the obtuse antero-lateral angle. 



Superior lateral margins strongly converging in a very sinuous 

 line to the level of the middle of the cardiac region. Posterior and 

 parallel to this line is a similar but short ridge. 



The eyebrow is about 5 times as wide as it is deep, and is nearly 

 vertical. Lower margin of orbit armed with subtruncate, separated 

 teeth. 



Upper surface of arm of large cheliped sparingly granulate ; inner 

 edge denticulate, outer edge granulate. Wrist tuberculate. Outer 

 face of palm tuberculate on the upper two-thirds, the tubercles 

 diminishing to granules below ; in shape subtriangular, as the upper 

 portion is bent over almost horizontally. Inner surface with an 

 oblique single row of tubercles from the lower margin to the carpal 

 cavity ; also a short parallel row leading down from the ridge on the 

 proximal half of the upper margin ; between the ridges a tuberculated 

 area. The two rows of tubercles at the base of the dactylus are 

 parallel and near together. Fingers one and a half times as long as 

 palm, smocth to naked eye, prehensile edges armed with three rows 

 of irregular tubercles, the largest one at the middle of the pollex. 



