148 U.S. NATIONAL MUSEUM BULLETIN 29 2 



Guinotia (Guinotia) garmani. — Pretzmann, 1965, p. 3 [by implication]. 

 Pseudothelphusa garmani garmani. — Rodriguez, 1966, p. 123, text-fig. 6, pi. 5. 



Diagnosis. — Carapace not very convex longitudinally or trans- 

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

 groove distinct, nearly straight; anterolateral margin denticulate, 

 denticles extending onto posterolateral margin, not emarginate either 

 near outer orbital angle or near end of cervical groove; front delimited 

 dorsally by strong, tuberculate, transverse crest concealing true 

 frontal margin from dorsal view. Third maxilliped with merus rather 

 evenly convex along distolateral margin; exopod much reduced, not 

 reaching end of basal fourth of lateral margm of ischium. Pereiopods 

 not unusually long and slender. Chela with prominent, swollen pro- 

 tuberance on outer surface near base of fingers. Fu'st pleopod of adult 

 male not armed distally mth scattered, short, stout spines; terminating 

 in long, blunt, finger-like projection and armed mesially with sharp, 

 subtriangular tooth directed mesially. A large species, maximum 

 carapace length in midline about 57 mm. 



Habitat. — In and near fresh water. 



Distribution. — Trinidad; Isla de Margarita; eastern Venezuela. 



Genus Pseudothelphusa 



51. ^^Pseudothelphusa''' ajjinis Rathbim 



Pseudothelphusa affinis Rathbun, 1898, p. 524 [type-locality: Cuba]; 1905, p. 301. 

 Potamocarcinus (Pseudothelphusa) affinis. — Ortmann, 1902, p. 309 [by implica- 

 tion]. 

 "Pseudothelphusa" affinis. — Pretzmann, 1965, p. 10. 



Diagnosis. — Carapace not very convex longitudmally or trans- 

 versely, broad, less than three-fifths as long as wide; cervical groove 

 curving slightly posteriorly near anterolateral margm; anterolateral 

 margin denticulate, without emargmations ; front delimited dorsally 

 by strong, tuberculate, transverse crest. Thnd maxilliped with merus 

 slightly convex laterally, concave distally; 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. A medium-sized species, carapace length 

 in midline about 23 mm. 



Habitat.— Presumably in or near fresh water. 



Distribution. — Known only from the unique specimen from Cuba. 



Remarks. — The generic status of this species, which is known only 

 from the dry female holotype, must remain in doubt until the male is 

 discovered. Ortmann (1902) notes that even the type-locality needs 

 confirmation. 



