HARRIS: CRAYFISHES GENUS CAMBARUS. 69 



19. Maryland. 



1. [Potomac R.], Montgomery county. (F., '85.) 



2. Potomac river, Charles county. (F., '85.) 



3. [Potomac R.], Williamsport, Washington county. (F., '85.) 



4. [Potomac R.], Cumberland, Alleghany county. (F., '85.) 



5. [Chesapeake bay], Anne Arundel county. (F., '85.) 



6. [Patapsco R.], Gaynns Falls, Druid Hill, etc., Baltimore county. (F., '85.) 



7. [Chesapeake bay], Cecil county. (F., '85.) 



29. New Jersey. 



1. [Trib. Delaware R., or Raritan R.], Schooley's Mountain, Morris county. 



(F., '85.) 



2. [Delaware R.], Camden county. (F., '85.) 



3. [Delaware R.], Trenton [Mercer county]. (F., '85.) 



4. [Delaware R.], Burlington [Burlington county]. (F., '85.) 



5. [Navesink R.], Red Bank, Monmouth county. (F. '85.) 



31. New York. 



1. [Niagara R.], Niagara [Niagara county]. (F., '85.) 



37. Peuusylvania. 



1. [Schuylkill R.?] [ county]. (F., '85.) 



2. [Trib. Delaware R.], Reading [Berks county]. (F., '85.) 



3. [Delaware R.], Philadelphia [Philadelphia county]. (F., '85.) 



4. [Trib. Susquehanna R.], Carlisle [Cumberland county]. (F., '85.) 



5. [Susquehanna R.], Bainbridge [York county]. (F., '85.) 



6. Susquehanna river. (F., '85.) 



7. [Delaware R.], Bristol [Bucks county]. (F., '85.) 



8. Brandy wine creek [Chester county]. (F., '85.) 



45. "Virginia. 



1. Potomac river, Gunston, Fairfax county. (F., '85.) 



2. Shenandoah river, Waynesborough [Waynesboro], [Augusta county]. 



(F., 90.) 



3. Blackwater river, Zuni [Isle of Wight]. (F., '90.) 



Abbott ('73) characterizes this as "a deep water [as compared 

 with C. acutus] , stone-hunting form." In the neighborhood of 

 Trenton, N. J., he found it usually resting under flat stones 

 well out from the banks of the stream, where the water was of 

 considerable depth, and also in fewer numbers on the mud-bot- 

 tomed portions of the river. He found none among the vege- 

 tation, where C. acutus was abundant. There was nothing to 

 indicate that it is a burrowing species. 



Smith ('74) takes his material from Abbott ('73). 



Faxon ('85) states that since Abbott's paper ('73) appeared 

 Doctor Abbott and he have taken C. affinis in great numbers from 

 shallow ditches in the Delaware meadows, near Trenton, N. J., 



