— 
CAMBARUS. 87 
vania: Brandywine Creek (Coll. Acad. Nat. Sci. Phila.) ; Schuylkill (Coll. 
Acad. Nat. Sci. Phila.); Reading (Girard) ; Philadelphia (Coll. Acad. Nat. Sei. 
Phila.); Bristol; Susquehanna River (Coll. U. 8. Nat. Mus.); Bainbridge 
(Coll. U. S. Nat. Mus.); Carlisle. Maryland: Cecil Co.; Havre de Grace, 
Harford Co.; Guynn’s Falls, Druid Hill, ete., Baltimore Co. (Coll. P. R. 
Uhler) ; Anne Arundel Co. (Coll. P. R. Uhler); Montgomery Co.; Charles 
Co., Potomac River (Coll. P. R. Uhler); Williamsport, Washington Co. 
(Coll. P. R. Uhler); Cumberland, Alleghany Co. District of Columbia: 
Washington, Potomac River (Coll. U. 8. Nat. Mus.). Virginia: Gunston, 
Potomac River, Fairfax Co. (Coll. U. S. Nat. Mus.). Lake Erie (Coll. Pea- 
body Acad. Sci.). Lake Superior (Coll. Bost. Soc. Nat. Hist.). 
Rafinesque’s description of Asfacus dimosus is as follows : — 
“N. Sp. Astacus limosus. Antens length of the thorax, rostrum equal 
to their peduncle, one-toothed on each side, canaliculated at its base; a 
thorn above the eyes, another on each flank, three pairs of pinciferous feet, 
bearded at their articulations, hands short, smooth, unarmed. — Obs. I dis- 
covered this species in 1803, and observed it again in 1816, in the muddy 
banks of the Delaware, near Philadelphia ; vulgar name, mud lobster; length 
from three to nine inches; good to eat; commonly brown, with an oliva- 
ceous tinge.” 
From the habitat it is probable that this imperfect description refers to 
the species well described in the following month by Say under the name of 
A. affinis, as assumed by Girard and Hagen. 
A dry male specimen in the Academy of Natural Sciences of Philadelphia, 
No. 127°, “Schuylkill. Dr. Harlan,” is probably Harlan’s type. — 
Milne Edwards, apparently misled by the transposition of the numbers 
of Fig. 2 and Fig. 3 on Harlan’s plate, has described this species as Astacus 
Bartonii; A. Bartonii as A. affinis. 
* Erichson’s type, a female, in the Berlin Museum, was examined by 
Hagen in September, 1870. The specimen is stated by Erichson to have 
been collected in Carolina by Cabanis. The label only gives America borealis. 
Dr. Cabanis assured Dr. Hagen that he collected all his Astacide in a rivulet 
near Greenville, in the northwestern part of South Carolina. No other speci- 
men of C. afinis has been reported from that State, and I suspect that Erich- 
son’s type belongs to the closely allied C. spinosus Bundy, which has been 
found in the Saluda River, 8. C., by Prof. D. S. Jordan. In the museum of 
the Academy of Natural Sciences is a specimen of this species (No. 127) 
