CAMBAHUS. 87 



vania: Brandywine Creek (Coll. Acad. Nat. Sci. Phila); So huylkill (Coll. 

 Ld. Nat Sci Phila.) ; Reading (Girard) ; Philadelphia (Coll. Acad. Nat. Sc, 

 p^". Bristol; Susquehanna River (Coll. U. S. Nat. Mu,) ; Bainbndge 

 (C^U. a Nat! MusO; Carlisle. Maryland: Cecil Co, Havre de Grace, 

 Harford Co, Guynn's Falls, Druid Hill, etc., Baltimore Co. (Coll. P. R. 

 Uhler,; Anne Arundel Co. (Coll. P. R Uhler) ; Montgomery Co, Charles 

 Co, Ptomac River (Coll. P. R Uhler); Williamsport Washing ton Co. 

 (Col P. R- Uhler); Cumberland, Alleghany Co. Distnct of Columbia. 

 Washington, Potomac River (Coll. U. S. Nat. Mus.). Vxrgmja : Guuston, 

 \vasmn i , n „ N . M x La ke Erie Coll. Pea- 



Potomac River, Fairfax Co. (Coll. U. b. Wat. mus.; 

 body Acad. Sci.). Lake Superior (Coll. Bost. Soc. Nat. Hist.). 

 Rafinesque's description of Astacus Umsus is as follows : - 

 « N Sp Astacus Umosus. Antens length of the thorax, rostrum equal 

 to then peduncle, one-toothed on each side, canaliculated at its base ; a 

 thom above the eyes, another on each flank, three pairs of pmcxferousfe, 

 bearded at their articulations, hands short, smooth, unarmed. - Oh, 1 dis- 



ered this species in 1803, and observed it again in 18 6 ,- 

 , )anks of the Delaware, near Philadelphia ; vulgar name, mud lob ei ; length 

 from three to nine inches; good to eat; commonly brown, with an ohva- 



Ce0 ^!m g 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. affirds, as assumed by Girard and Hagen. 



A dry male specimen in the Academy of Natural Sciences of Phdadelphta, 

 No 127 b "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 

 Bartomi ; A. Bartmw as A. affinis. . 



Erichsons type, a female, in Urn Berlin Museum, was examined by 

 Hagen in September, 1870. The specimen is stated by Enchson to have 



been collected in Carolina by Cabanis. The label only gives Anenca to te 



Dr Cabanis assured Dr. Hagen that he collected all his Astacuhe ma nvulcl 

 near Greenville, in the northwestern part of South Carolina. No other spec, 

 men of C. affirm has been reported from that State, and I suspect that Ericn- 



BOn 's type belongs to the closely allied C. spi » Bundy, which has been 



found fn the Saluda River, S. C, by Prof. D. S. Jordan. In the museum o 

 the Academy of Natural Sciences is a specimen of tins species (No. 1-0 



