98 Proceedings of the Biological Society of Washington. 



25.2 by44.2mm.,the largest hard-shell female (45,722) is31.3by57.2mm. ; 

 a thin-shell female (45,873) is about I mm. larger. 



A female (45,724) is accompanied by over 50 young in the first free- 

 swimming stage ; some of them are still attached to the abdomen ; they 

 have the general form of the adult ; the upper margin of the front is just 

 beginning to develop; the exognath is longer than in larger specimens 

 but does not reach end of ischium ; the efferent branchial orifice is open, 

 the jugal spine not yet developed. 



One female (45,721) has the left cheliped represented by a very short 

 stump; the right cheliped is of normal size but the fingers are strongly 

 bent, tlie immovable finger outward and the dactylus inward so that 

 their planes form an angle of about 55°. 



Pseudothelphusa angulata sp. nov. 



Holotype. — Adult male, Cat. No. 45,880, Museum of Zoology, Uni- 

 versity of Michigan, Ann Arbor, Micliigan. Collected above Mlnca, 

 Santa Marta INIountains, Colombia, 2900 feet elevation, under stones 

 bordering a rill, July 10, 1913. 



Measurements. — Holotype male, length of carapace on the median line 

 40 mm., width of carapace 65 mm., width between outer angles of orbits 

 32 mm., width of front above, between the eyes, 15.3 mm., length of 

 larger propodus below 52.7 mm., height of palm at distal end 19.9 mm., 

 greatest tliickness of palm 14.6 mm. ; length of dactylus of cheliped 

 (approx. ) 27.2 mm. 



Description. — This species in its shape and ornamentation resembles 

 the preceding, but is somewhat larger. The front is narrower and the 

 orbits higher. The orifice of the efferent branchial channel is wide open 

 behind. The merus of the outer maxilliped is similar in shape to that of 

 pearsei, having a concave outer margin, but that margin forms at its 

 union with the anterior margin a very prominent angle or lobe, to which 

 the specific name refers. Exognath very short, about J^ as long as 

 ischiognath. Chelipeds rougher than in pearsei, carpal tooth acute. 



Shape of male abdomen subtriangular after the third segment. Append- 

 age of first segment with a large outer lobe near the end; tip subtruncate, 

 with a short projecting point. 



Relationships. — Near P. monticola Zimmer* but distinguished as fol- 

 lows: In monircoZa the outer margin of the merognath is not concave 

 and the antero-external angle not so well marked or so advanced ; the 

 penultimate segment of the abdomen is shorter; the lobe on the outer 

 edge of the first abdominal segment is more evenly rounded, not subtri- 

 angular as in angulata. 



Pseudothelphusa clausa sp. nov. 



Holotype. — Adult male. Cat. No. 45,864; Museum of Zoology, Uni- 

 versity of Michigan, Ann Arbor, Michigan. Collected in brooklet, 



♦ Mem. Soc. iieuchdteloise Sui. nat., vol. 5, 1912, p. 3, pi. 1, figs. 3 and 4, text-figs. C-10. 



