ORTMANN: THE CRAWFISHES OF THE STATE OF PENNSYLVANIA 377 



4. Cambarus (Bartonius) bartoni (Fabricius). 

 .Plate B, Fiji. 1 ; IMate XXXIX, Fig. ]ctr-]f, and Fig. 8 ; Plate XL, Fig. 2.) 



Astacus harloni Fabricius, 1798, p. 407 ; Say, 1817, p. 167 ; Harlan, 1835, p. 230. f. 3 ; Gould, 1841, p. 330 ; Thompson, 



1842, p. 17(1 ; De Kay, 1844, p. 22, PI. 8, f. 23 ; Gibbes, 1850, p. 195, (jmrtim). 

 Aatacus ciliaris Kafinesque, 1817 p. 42. 

 Aalacus pusillus Rafinesque, 1817, p. 42. 

 Astacus ojjiuis Milne-Edwards, 1^37, p. 332 (non Say). 

 Cambdrus barluni Girard, 1852, p. 88; Bell, 1859, p. 210; Hagen, 1870, p 7.5, PI. 1, f. 47-50, PI. 2, f. 1:55-139. PI 3, 



f. 166; Abbott, 1873, p. 80; Smitb, 1874, p. 639 ; Putnam, 1874, p. 191 ; Faxon, 18846, p. 22; Kaxon, 1885a, p. 



59 ; Faxon, 18856, p. a58 ; Underwood, 18*'6, p. 367 ; Ganong, 1887, p. 74 ; Faxon, 1890, p. 622 ; Hay, 1896, p. 



487, f. 6; Faxon, 1898, p. 649; Osburn and Williamson, 1898, p. 21 ; Williamson, 1899, p. 47; Hay, 1899, p. 



959, 966 ; Williamson, 1901, p. 11 ; Ortmaun, 1905ri, p. 3!H) ; Paulmier, 1805, p. 134, f. 6 ; KathbuD, 1905, p. 18. 

 Camharus pimllus anA monlanus Girard, 1852, p. 88. 

 Cambarus {Jinrlonius) barloni OTtmUBD, 1905i, p. 120, 134. 



Body robust, very sparsely pubescent in fresh, but perfectly naked in old speci- 

 mens, with only a few hair8 on the fingers of the cheltc, and sometimes a slight 

 pubescence on the cutting edge of the fingers. 



Carapace subovate, strongly depressed. (V : 7/: /> = 1 : 1..') or 1.4:1.5 or 1.6. 

 Greatest width of branchial regions well forward, at a short distance behind the 

 cervical groove. Upper surface of carapace very Hat. 



Cervical groove deep, not interrupted on the sides. Areola distinctly longer than 

 half of the anterior section of carapace; a:p = 1 :0.6 Areola rather broad («• : / 

 = 1 : 5 or G), with about 3-5 irregular rows of punctures. 



Rostrum (Plate X.\ .\ I .\, Ilg. l'/-l/') broad and short, reaching generally to the 

 distal end of the second joint of the peduncle of the antennula, and hardly be- 

 yond the middle of the fourth joint of the peduncle of the antenna. Upper surface 

 almost flat or only slightly concave, but margins elevated, without marginal spines. 

 The margins converge more or less from the base, sometimes they are almost par- 

 allel, and near the apex they are suddenly contracted into a short, triangular acu- 

 men having a sharp point. The angles at the base of the acumen are rounded, but 

 generally well marked, and the elevated margins are continued to the apex, al- 

 though slightly decreasing distally from the lateral angles. Postorbital ridges short, 

 almost parallel, angulated anteriorly, but without spine, except in young 

 specimens. 



Surface o/co?-«^:)rfcci punctate, distinctly granulated on the hepatic region in larger 

 specimens. There are also a few more or less distinct granulations immediately be- 

 hind the cervical groove, but no spine. External orbital angle well marked by an 

 angulation or a small tubercle, more rarely, and only in young specimens, spiniform. 

 Branchiostegal spine formed by a small tubercle, which is sometimes ol isolate. 



