DECAPOD CRUSTACEANS OF THE WEST INDIES 143 



by two obscure notches, one at end of cervical groove, one near outer 

 orbital angle; front delimited dorsally by strong transverse crest 

 hiding entire true frontal margin from dorsal view. Third maxLUiped 

 with merus subquadrate, lateral margin feebly convex, distal margin 

 somewhat concave; exopod extending beyond ischiomeral articula- 

 tion. Pereiopods not unusually long or slender. Chela without prom- 

 inent, swollen protuberance on outer surface near base of fingers. 

 First pleopod of adult male armed distally with scattered, short, stout 

 spines; elongate lobe directed posteriorly in situ. A large species, 

 maximum carapace length in midline about 60 mm. 



Habitat. — In and near fresh water. 



Distribution. — Puerto Rico; Saint Croix. 



Subfamily Pseudothelphusinae 

 Genus Guinotia 



49. Guinotia {Guinotia) dentata (Latreille) 



Figures 40, 41, 43a-c 



Telphusa dentata Latreille, 1825c, p. 564 [type-locality: Martinique]. 



Potamia dentata. — Latreille, 1831, p. 338. 



Cancer (Thelphusa)? dentatus. — De Haan, 1833, p. 23. 



Boscia dentata. — H. Milne Edwards, 1837, p. 15, pi. 18: figs. 14-16. 



Pseudothelphusa dentata. — Smith, 1870, p. 147. — Rathbun, 1905, p. 300, text-fig. 



93, pi. 16 (XIV) : fig. 4. 

 f Pseudotelphusa tenuipes Pocock, 1889, p. 7, pi. 2: figs. 1, la [type-locality: 



Laudat, Dominica]. 

 Pseudotelphusa dentata. — Pocock, 1889, p. 9. 

 Potamocarcinus dentatus. — Ortmann, 1897 [part], pp. 317, 318. 

 Guinotia {Guinotia) dentata. — Pretzmann, 1965, p. 3 [by implication]. 

 fGuinotia (Neopseudothelphusa) tenuipes. — Pretzmann, 1965, p. 3 [by implication]. 

 Guinotia dentata. — Mitchell, 1966, p. 89 [color photograph]. 



Diagnosis. — Carapace not very convex longitudinally or trans- 

 versely, rather broad, about tln-ee-fifths as long as wide; cervical 

 groove very distinct, nearly straight; anterolateral margin denticulate, 

 denticles extending well onto posterolateral margin, very shallow 

 emargination near outer orbital angle and occasionally a second near 

 end of cervical groove; front delimited dorsally by strong, tuberculate, 

 transverse crest liiding all but extreme lateral portions of true frontal 

 margin from dorsal view. Third maxilliped with merus narrowing 

 distally, lateral margin slightly convex, distal margin concave or 

 broadly notched lateral to insertion of palp ; exopod not reaching mid- 

 length of lateral margin of ischium. Pereiopods not unusually long or 

 slender. Chela without prominent, swollen protuberance on outer 

 surface near base of fingers. First pleopod of adult male not armed 



