362 CRAYFISHES. 
Two specimens, 17, 1 9, in the U.S. N. M., No. 20,073, from Piobesi, near 
Turin, Italy, received from the Turin Zoélogical Museum agree in the essential 
characters with the Pompeiian specimens. 
From these specimens I infer that the Cisalpine crayfishes constitute a 
marked geographical race, which in some respects (viz. the form of the rostrum, 
antennal scale, epistoma, and gonopods) shows an approach to Astacus astacus. 
It is not, however, liable to be confounded with that species, since the median 
carina of the rostrum is not denticulated, and the post-orbital ridges are entire, 
not broken up into an anterior and a posterior section as is the case with Astacus 
astacus. In the important matter of the branchial apparatus, moreover, Astacus 
pallipes italicus differs from A. astacus and agrees with A. pallipes in having but 
two rudimentary pleurobranchiae on each side of the body, upon the eleventh 
and twelfth body-segments." 
The crayfish found in the neighbourhood of Madrid, Spain, is in almost 
every respect like the typical French Astacus pallipes. It does, however, show 
an approach to the Italian examples in one regard, viz. an enlargement of the 
anterior process of the epistoma, and with this in a few specimens goes a tendency 
toward a broadening of the rostrum. It would nevertheless be an over-refine- 
ment to separate the Spanish ecrayfishes from Astacus pallipes. 
CAMBARUS DIGUETI Bouvier. 
Cambarus digueti Bouv., Bull. Mus. d’Hist. Nat., Paris, 1897, 3, p. 225. 
Cambarus carinatus Faxon, Proc. U.S. Nat. Mus., Feb. 17, 1898, 20, p. 648. 
New locality:— Ocotlan, State of Jalisco, Mexico (Field Mus. Nat. Hist.). 
CAMBARUS PILOSIMANUS Ortmann? 
A young female crayfish, 35 mm. long (M. C. Z., No. 7,405) was collected 
by Mr. J. L. Peters at Camp Menzel, 36 miles from the mouth of the Hondo 
River, in the Territory of Quintana Roo, Mexico, March 27, 1912. It is closely 
affined to C. pilosimanus and C. williamsoni of Ortmann, if not identical with one 
of these. It presents certain features, however, that are not found in either of 
Ortmann’s species; viz: — there are two well-marked spines, one above the 
1 This was determined by examination of the branchial apparatus of two examples from the type 
lot of A. p. italicus from the River Sarno. The rudimentary gills borne on the eleventh and twelfth 
somites have the form of reduced simple filaments representing the stem of the completely formed gill. 
