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 chele 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 chele, which differ 
in a number of features from the types of chelz usually seen 
in the genus Cambarus. 
Measurements: 
The following are the dimensions of the three type-speci- 
mens: o'(I): total length 48 mm.; carapace 23; anterior part 
15, posterior part 8; abdomen 25; hand 17, palm 1, fingers 10; 
width of hand 7.—d' (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.— ?: 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 S (I) measures 51 mm., and the largest 2 
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 
