Fic. 
Fia. 
Fie. 
Fia. 
Fic. 
Fie. 
3a. 
4b. 
6b. 
Te. 
ORTMANN: THE CRAWFISHES oF THE STATE OF PENNSYLVANIA 519 
Cambarus bartoni robustus (Girard). Rostrum. 4, 
Female, 89 mm. long. Collected by the writer Oct. 4, 1904, in Temple Creek, Albion, 
Erie County. Catalogue number 74.435. Normal shape. 
Young female, 18 mm. long. Collected by Miss G. Kinzer, Aug. 27, 1905, in Sixteen- 
Mile Creek, Northeast, Erie County. Catalogue number 74.630. Normal shape in 
young specimens. 
Cambarus carolinus Erichson, Rostrum. 4. 
Male, first form, 66 mm. long. Collected by the writer, Sept. 5, 1905, at Ohiopyle, 
Fayette County. Catalogue number 74.640. Normal shape. 
Male, second form, 30 mm. long. Collected by the writer, June 11, 1904, at Indian 
Creek, Fayette County. Catalogue number 74.365. Shape exceptional. Most ex- 
treme case as regards convergence of margins. 
Cambarus monongalensis Ortman. Rostrum. 4. 
Male, first form, 63.5 mm. long. (Type.) Collected by the writer, May 21, 1905, a 
Edgewood Park, Allegheny:County. Catalogue number 74.316. Normal shape. 
Female, 73 mm. long. Collected by the writer, Oct. 12,1904, at Hill, Westmoreland 
County. Catalogue number, 74.449. Shape unusually broad, and margins almost 
parallel. Most extreme case in this direction, standing rather isolated. 
Cambarus limosus (Rafinesque). Left first pleopod of male, first form. 3. 
Inner view. Collected by the writer, Sept. 19, 1904, in Marcus Hook Creek, Mar- 
cus Hook, Delaware County. Catalogue number 74.423. 
Posterior view of same. 
Cambarus propinquus Girard. Left first pleopod of male. 3. 
Inner view, male, first form. Collected by the writer, Oct. 4, 1904, in Temple Creek, 
Albion, Erie County. Catalogue number 74.439. 
Inner view, male, second form. Collected by the writer, June 7, 1904, in a tributary 
of Conneaut Creek, Conneautville Station, Crawford County. Catalogue number 
74.336. 
Cambarus obscurus Hagen. Left first pleopod of male. 3. 
. Inner view, male, first form. Collected by the writer, Aug. 24, 1904, in the Ohio 
River, Ambridge, Beaver County. Catalogue number 74.401. 
. Posterior view of same (horny tip of outer part hidden behind inner part). 
Inner view, male, second form. Collected by the writer, June 24, 1904, in the Loyal- 
hanna River, Crisp, Westmoreland County. Catalogue number 74.352. 
. Inner view, hermaphroditic specimen (type of male, first form). Collected by Atkin- 
son, Graf, and Williamson, May 14, 1899, in the Ohio River, Neville Island, Alle- 
gheny County. Catalogue number 7.436. (See text, p. 376.) 
Posterior view of same. 
