216 U.S. NATIONAL MUSEUM BULLETENT 292 



Diagnosis. — Carapace broadly subtrapezoidal, about two-thirds as 

 long as wide, only moderately convex longitudinally, surface uneven 

 but relatively smooth and bare; fron to-orbital distance representing 

 maximum carapace width; front widening toward base, not sub- 

 spatulate, width between posterodistal angles of basal segments of 

 eyestalks, with eyes retracted, slightly more than one-third of fronto- 

 orbital distance; lateral margins converging posteriorly from outer 

 orbital angles, posterolateral ridges forming distinct angle with lateral 

 margins, strongly convergent, convex anteriorly. Cornea considerably 

 swollen, occupjdng nearly two-fifths of extensor surface of distal seg- 

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

 small and subequal in females; fingers of major chela of male more 

 than twice as long as 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 terminating, in posterior view, in 

 obliquely tnmcate tip with very small, sharp spine at distomesial 

 angle (fig. 73c). A small species, maximum carapace length in midline 

 about 10 mm. 



Habitat. — Very wet mud. 



Distribution. — Southern and western Florida, Yucatan Peninsula, 

 Cuba, Jamaica. 



Remarks. — The male from Kingston Harbor, Jamaica, reported 

 as Uca spinicarpa by Rathbun (1918) proves to be U. speciosa, 

 whereas the two lots from Curasao recorded as U. speciosa by the 

 same author (1918 and 1924) are U. cwnulanta. 



90. Uca thayeri Rathbun 



Figures 73e, / 



Uca thayeri Rathbun, 1900b, p. 134, pi. 8: figs. 1, 2 [type-locality: mouth of Rio 



Paraiba, Estado da Parafba, Brazil]; 1918, p. 406, text-fig. 169, pi. 144. 

 Uca (Minuca) thayeri. — Holthuis, 1959, p. 275, text-figs. 6Sb-c, pi. 16. 



Diagnosis. — Carapace subtrapezoidal, slightly less than two- 

 thirds as long as wide, moderately convex longitudinally, surface 

 uneven and at least partially covered with scurflike pubescence; 

 fronto-orbital distance nearly or quite equalling maximum carapace 

 width; front widening toward base, very obscurely constricted between 

 bases of eyestalks, width between posterodistal angles of basal seg- 

 ments of eyestalks, with eyes retracted, slightly more than one-fifth 

 of fronto-orbital distance; lateral marginal ridge converging strongly 

 in regular curve posteriorly from outer orbital angles or just posterior 

 thereto. Cornea considerably swollen occupying about one-third of 

 extensor surface of distal segment of eyestalk. Chelipeds greatly 



