ORTMANN: THE CRAWFISHES OF THE STATE OF PENNSYLVANIA 349 
affinis = limosus, Schuylkill River at Reading, Bucks County; C. barton, Foxburg, 
Clarion County; Carlisle, Cumberland County; Berwick, Columbia County. 
In Hagen’s Monograph (1870) no new species are added, although he doubtfully 
records (p. 100) C. obscwrus from the state, but this was done under the erroneous 
assumption that Astacus fossor of Rafinesque is the same as C. obscwrus. Thus 
Hagen’s Monograph adds only a few new localities, namely: for C. limosus (affinis) 
the Schuylkill River, Philadelphia, and Carlisle, Cumberland County. ‘The new 
locality “Pittsburgh” for the same species is wrong. 
The great revision of the genus published by Faxon (1885a) adds two species : 
C. diogenes from Derry, Westmoreland County, and C. rusticus from Pittsburg. 
The latter record is incorrect, and should be dropped. Besides Faxon gives the fol- 
lowing new localities: C. limosus, Brandywine Creek, Chester County; Delaware 
River, Bristol, Bucks County; Bainbridge, Lancaster County; C. barton, Bedford 
and Pattonville, (see infra, foot-note 16), Bedford County; Windham, Bradford 
County; Hummelstown, Dauphin County; Chester County; Bainbridge, Lancaster 
County; McKean County. 
Thus only three species were known up to this date: C. limosus, C. bartoni, and 
C. diogenes. 
In 1898 Faxon added a fourth species for the state, C. obscwrus from Westmore- 
land County, and also gave a new locality for C. bartoni, Westmoreland County. 
Williamson (1901) enumerated five species, and one variety from Allegheny 
County, but, as has been demonstrated by the writer (1905a), this is to be reduced 
to four species and one variety, of which the species recorded as CU. dubius by 
Williamson (C. monongalensis Ortmann) is new for the state, as is also the variety C. 
bartoni robustus. Allegheny County is for the first time cited as a locality for the 
other species, C. obscwrus (recorded as C. propinquus and rusticus), C. bartoni, and C. 
diogenes. Williamson’s discoveries brought up the number of species known from 
the state to five, and one variety, namely: C. limosus, C. obscwrus, C. bartoni, C. bar- 
toni robustus, C. monongalensis (as dubius), and OC. diogenes. 
In the preliminary report of the writer for western Pennsylvania, two other 
species were added : C. propinquus from Erie and Crawford Counties, and C. carolinus 
from Fayette, Westmoreland, and Somerset Counties. Numerous new localities 
were added to those already known. C. dubiws of Williamson was recognized as a 
species new to science, and described as C. monongalensis. ‘The number of species 
present in the state has not been increased by subsequent investigations, and stands 
now as seven, with one variety, namely: Cambarus limosus (Rafinesque) ; C. prop- 
inquus Girard; C. obscurus Hagen ; C. bartoni (Fabricius) ; C. bartoni robustus (Girard); 
C. carolinus Erichson ; C. monongalensis Ortmann ; C. diogenes Girard. 
