6 ORTMANN 



sexual organs, as well as the spiniform process, not horny ; 

 hook of fourth pereiopods smaller and weaker. 



Female: Similar to the male, but chelae not so strong. An- 

 nulus ventralis transversely semicircular, anterior margin con- 

 vex, elevated, with a curved longitudinal fissure ; posterior 

 margin with a subtriangular depression. Sternum between the 

 fifth pereiopods with a triangular, spiniform process, directed 

 forward, which fits into the depression of the annulus. 



Aside from the peculiarities offered by the subgeneric charac- 

 ters, this species is also remarkable for its chelae, which differ 

 in a number of features from the types of chelae usually seen 

 in the genus Cambarus. 



Measurements : 



The following are the dimensions of the three type-speci- 

 mens : c? (I) : total length 48 mm.; carapace 23; anterior part 

 15, posterior part 8 ; abdomen 25 ; hand 17, palm 7, fingers 10 ; 

 width of hand 7. — c? (II) : total length 48.5 mm.; carapace 

 23.5, anterior part 15.5, posterior part 8 ; abdomen 25 ; hand 16, 

 palm 6.5, fingers 9.5 ; width of hand 6. — 9 : total length 48 

 mm. ; carapace 23, anterior part 15, posterior part 8 ; abdomen 

 25 ; hand 15, palm 6.5, fingers 8.5 ; width of hand 6. 



The largest cT (I) measures 51 mm., and the largest 9 

 54.5 mm. 



Locality : Sierra de Zacapoaxtla, State of Puebla, Mexico. — 

 L. Diguet coll. 1904 (" ruisseaux torrentueux des montagnes, a 

 le cafiada de Tetela de Ocampo"). (Mus. Paris, numerous 

 specimens.) 



II. CAMBARUS (PROCAMBARUS) PILOSIMANUS, 



new species. 



Diagnosis : Rostrum subplane, with a marginal spine on each 

 side ; carapace with two lateral spines on each side ; areola nar- 

 row, as long as, or longer than, half of the anterior section of 

 the carapace ; first pereiopods with the chela long, subcylindri- 

 cal, slightly compressed, covered with tubercle-like granules ; 

 fingers about as long as the palm, each with a smooth longi- 

 tudinal ridge on the outer side, for the rest densely pilose on 



