ORTMANN: THE CRAWFISHES OF THE STATE OF PENNSYLVANIA 407 
Inuinois: Chicago, Cook County, (Hagen); Evanston, Cook County, (Hagen) ; 
Lawn Ridge, Marshall County, (Hagen); Abingdon, Knox County, (Faxon) ; 
Decatur, Macon County, (Faxon); Belleville, St. Clair County, (Hagen). 
Wisconsin: “Abundant in Wisconsin,” (Bundy); Racine, Racine County, 
(Faxon); Green County, (Faxon); Appleton, Outagamie County, (Faxon). 
Minnesora: Fort Snelling, Hennepin County, (Faxon). 
Iowa: Davenport, Scott County, (Faxon); Delhi, Delaware County, (Faxon) ; 
selmond, Wright County, (Faxon). 
Missourr: St. Louis, St. Louis County, (Faxon); Carroll County, (Faxon). 
Kansas: Leavenworth, Leavenworth County, (Faxon); Lawrence, Douglas 
County, (Harris). 
ARKANSAS: Paragould, Greene County, (Faxon); Fayetteville, Washington 
County, (Faxon). 
Mississtpp1: Monticello, Lawrence County, (Hagen). 
LourstaAna : New Orleans, (Hagen). 
Wyomina : Cheyenne, Laramie County, (Faxon). 
Cotorapbo: Clear Lake, (Faxon)”; Boulder, Boulder County, (Harris). 
REMARKS. 
Cambarus diogenes occupies two areas, in the United States, which, according to 
our present knowledge, are separated from each other; a western and an eastern. 
Both areas enter Pennsylvania, the one extending over a large portion of the south- 
western territory of tlris state, the other being much smaller and restricted to the 
southeastern extremity. 
I have closely studied the material at hand, and have found certain differences 
between eastern and western specimens, which however are very slight, and not 
always constant; yet a tendency to a morphological separation between the eastern 
and western forms seems to be indicated. Faxon (1885a, p. 72) has already called 
attention to some of these differences. 
The description given above refers chiefly to the eastern form of this species. 
Specimens from western Pennsylvania show the following differences : 
1. Areola in most cases not entirely obliterated. There are, indeed, cases in the 
eastern form where the two lines bordering the branchial regions are not in contact, 
but they are rare. In western Pennsylvania the latter condition is rather the rule, 
although specimens in which both lines unite, forming in the middle only one line, 
28 Location unknown to the writer. 
® Professor T. D. A. Cockerell has sent to me for examination a young male collected October 7, 1905, in a small 
stream near Boulder. Although very small it clearly belongs to this species. 
