CRAYFISHES. 363 
other, on each side of the latero-anterior margin of the carapace, above the well- 
developed branchiostegian spines. This is a feature that one would not suspect 
to bea juvenile mark, and it may denote specific diversity. There are, moreover, 
two sharp spines on the second segment of the antennae near the base of the 
antennal scales. 
The chelae of the specimen collected by Mr. Peters are slender and nearly 
smooth, the fingers sparsely pilose, the spines of the carpus and merus well devel- 
oped, as in young specimens of C. pilosimanus according to Ortmann. The 
anterior segment of the telson is three-spined on each side, the inner spine being 
very small; the median longitudinal rib on the dorsal face of the inner branch 
of the last abdominal appendages ends in a spine some distance from the posterior 
margin. E 
The type locality of C. pilosimanus is Coban, Guatemala. Dr. Ortmann 
also records one specimen, in the Museum of Natural History of Paris, from 
Belize, British Honduras, a locality not very remote from the place where Mr. 
Peters got his specimen. Mr. A. 8S. Pearse (13th Ann. Rep. Mich. Acad. Sci., 
1911, p. 110) has more recently recorded it from Cuatotolapam, Canton of 
Acayucan, State of Vera Cruz, Mexico. The type locality of C. williamsoni is 
Los Amates, Province of Izabal, Guatemala. 
CAMBARUS MEXICANUS Erichson. 
New localities:— Mexico: Tuxtla Gutierrez, State of Chiapas (U. 8. N. 
M., No. 30,580); Jalapa, State of Vera Cruz (Field Mus. Nat. Hist.). 
Mr. A. 8. Pearse! has recently redescribed this species under the name 
Cambarus ruthveni, sp. nov., from the hacienda of Cuatotolapam, Canton of 
Acayucan, State of Vera Cruz, Mexico, altitude, 15 metres. 
CAMBARUS CUBENSIS Erichson. 
New localities:— Cupa: Almendares River, Calabazar, Province of Habana 
(U. S. N. M., No. 31,881); Unién de Reyes, Province of Matanzas (M. C. Z., 
No. 7,633); Ciego de Avila, Province of Camagiiey (Coll. J. T. Nichols). 
There is a small specimen, a male, only ? in. long, in the U. 8. National Mu- 
seum (No. 28,625), from Nueva Gerona, Isla de Pinos. It was collected by 
1 Report on the Crustacea collected by the University of Michigan — Walker Expedition in the State 
of Vera Cruz, Mexico. Thirteenth Ann. Rep. Mich. Acad. Sci., 1911, p. 110. 
