214 U.S. NATIONAL MUSEUM BULLETIN 292 



between coxae of third and fourth pereiopods. Denuded first pleopod 

 of male terminating, in posterior view, in tapered tip directed disto- 

 laterally (fig. 7li). A medium-sized species, maximum carapace 

 length in midline about 20 mm. 



Habitat. — Mangrove swamps. 



Distribution. — Bahamas and Mexico to French Guiana (Bimini 

 Is., San Salvador I., Cuba, Jamaica, Puerto Rico, Saint Croix, 

 Guadeloupe). 



Remarks. — Inasmuch as many of the localities cited by Seba 

 (1761) have proved to be erroneous, it is unlikely that the specimen 

 figured by him as "Cancer Uka una, Brasiliensis," and selected by 

 Holthuis (1962) as the lectotype of this species, came from Brazil. 

 The species has not been recorded since from any locality south of 

 Cayenne, French Guiana. As the identity of the species is not in 

 question at the present time, there seems to be no justification for 

 designating a neotype, apparently the only means by which the type- 

 locality can now be corrected. 



88. Uca rapax (Smith) 



Figures 73a, b 



Gelasimus rapax Smith, 1870; p. 134, pi. 2: fig. 2; pi. 4: fig. 3 [type-locality: Colon, 



Panama]. 

 Uca pugnax rapax. — Rathbun, 1901, p. 7, 1918, p. 397, pi. 140. 

 Uca rapax. — Tashian and Vernberg, 1958, p. 89, pi. 1: figs. 3, 4. 

 Uca (Minuca) rapax. — Holthuis, 1959, p. 266, text-figs. 64d-f, 65, pi. 14: figs. 



4-6; pi. 15: fig. 3. 



Diagnosis. — Carapace broadly subtrapezoidal, about two-thirds 

 as long as wide, strongly convex but not semicylindrical longitudinally, 

 surface smooth and polished, without pubescence; fronto-orbital 

 distance slightly less than maximum carapace width; front widening 

 toward base, not subspatulate, width between posterodistal angles 

 of basal segments of eyestalks, with eyes retracted, about one-third of 

 fronto-orbital distance; lateral margins diverging slightly posteriorly 

 from outer orbital angles, curving rather regularly into strongly con- 

 vergent posterolateral ridges. Cornea moderately swollen, occupying 

 between one- third and two-fifths of extensor surface of distal segment 

 of eyestalk. Chelipeds greatly dissimilar and unequal in males, small 

 and subequal in females; fingers of major chela of male much longer 

 than palm, slender, widely gaping, not unusually compressed. Second, 

 third, and fourth pereiopods pubescent on extensor margins of carpus 

 and propodus. Hair-fringed ventral opening present between coxae of 

 third and fourth pereiopods. Denuded first pleopod of male ter- 

 minating, in posterior view, in two blunt distal projections directed 



