136 ORTMANN — AFFINITIES OF CAMBARUS. [April 13, 
Doubtful records. — Faxon, 1885, gives Deer Park, Garrett Co., 
Md. ‘This should be confirmed ; according to the writer’s experi- 
ence, C. carolinus ought to be expected there. If confirmed, this 
locality will be highly interesting. 
Faxon further gives: Cheyenne, Wyoming, and Clear Lake, 
Colorado ; in both cases the most western extremity of the range 
of the genus is reached. Harris (Kansas Univ. Quart., 9, 1900, p. 
267) gives: Boulder, Colorado. This serves to establish the cor- 
rectness of the above records, but the connection with the rest of 
the range must be found (I have not been able to locate Clear Lake 
in Colorado).. The southern.localities for C. dzogenes recorded by 
Faxon, Monticello, Lawrence Co., Miss., and New Orleans, 
Louisiana, certainly need further support. 
C. argillicola Fax. 
New locality. — Oberlin, Lorain Co., Ohio (Mus. Oberlin). —I 
have seen three specimens from Oberlin (adult and young male, 
adult female), two of which bear the label: Hovey’s Ice house, 
northeast of Oberlin, coll. by Leuthi, Sept. 29, 1892. 
Doubtful records.— The localities, Kinston, N. Carolina, and New 
Orleans, Louisiana, given by Faxon in | 1885 are doubtful, as 
admitted by himself. The localities given in 1898, Victoria and 
Brazoria, Texas (U.S. Mus. ), most emphatically need confirmation. 
CARNEGIE MusEuM, 
PITTSBURGH, April 7, 1905. 
EXPLANATION OF PLATE VIII. 
The plate is introduced to illustrate the centers of origin, and the chief directions 
of migration of the different subdivisions of the genus Camzbarus. Circles or ellip- 
ses indicate centers of origin, the lines radiating from these, and ending in an 
arrow-point, indicate the migration. The different colors mark the different sub- 
genera: Red, Cambarus ; brown, Cambarellus ; green, Faxonius ; blue, Bartonius., 
It will be remarked that two centers are given for the subgenus Caméarus - the 
one in Mexico marks that of the more primitive forms, the other in Alabama and 
Georgia, that of the more highly advanced forms (é/andingt-section). ‘This latter 
one, as well as the subgenera Faxonius and Bartonius, took their origin probably 
from a primitive stock of the subgenus Caméarus, immigrated into the southern 
United States along the broken red line running from Kansas to Alabama. 
For further particulars see text, pp. 103, 106, 113, 121, and 124 ff. 
