352 MEMOIRS OF THE CARNEGIE MUSEUM 



c" . Areola generally obliterated in the middle, or extremely narrow. Inner margin of hand with several 

 rows of tubercles. Color greenish or brownish. Rostrum rather long and narrow. (Swamps on hills 

 and in lowlands, southwestern and eastern Pennsylvania.) C. (Buitniiius) diogenes Girard. 



C. Description and DistrUyut'ion of the Specicfi. 



1. (Jambarus (Faxonius) limosus (Rafinesque). 



(Plate B, Fig. 3; Plate XXXIX, Figs. 5fl. and 5h.) 



Aslacns limosus Rafinesque, 1817, p. 4 . 



Ashivtis nffinis Say, 1817, p. 168 ; Harlan, 183.5, p. 230, fig. 2 ; DeKay, 1844, p. 23 ; Gibbes, 1850, p. 195 ipartim). 



J.s^ic'Ms 6(((7()«/ Milne-Edwards, 1837, p. 331 (now Fabricius). 



Cambariis affinis Girard. 1852, p. 37 ; Hagen, 1870, p. (10 ; PI. 1, figs. 19, 22, 84, 85, PI. 3, fig. 152, PI. 5 ; Abbott, 1873, 



p. 80 ; Smith, 1874, p. 638; Faxon, 1881J, p. 146 ; Fa.xon, 1885^, p. 86 ; Fa.xon, 188.5//, p. 360 ; Underwood, 1886, 



p. 366 ; Faxon, 1890, p. 628 ; Hay, 1899, p. 960, 964 ; Andrews, 1894, p. 165. 

 Cumbarus pealei Girard, 1852, p. 87. 

 Cambnrus (F<i.rn7ihis) limosus Ortniann, 19056, p. 107, 112, 131. 



Body robust, puliescent all over, but chiefly so on carapace and chela?; but the 

 pubescence wears off easily, and in old individuals, especially in early spring, the 

 body is more or less hairless. The hairs are most persistent on the fingers of the 

 large chelfe. 



Carapace subovate, depressed, the depression being brought about l)y a bulging 

 out of the brancliial regions. Tlie vertical lieight of the carapace, at a point ab<jut in 

 the middle of the gastric region (measured from this point to a point on the sternum 

 just in front of the first jiereiopods), the vertical height of the carapace at a point ot' 

 the areola directly above the sternum between the second pereiopods, and tlie great- 

 est width of the carapace at the hepatic regions are about the same; while the great- 

 est width of the carapace at the Ijranchial regions is distinctly greater. Rehition 

 G : H: 11 — I A : 1.2 to 1.4.^ The greatest width of carapace (at branchial regions) 

 is well behind, at about the middle of the branchial regions. The whole carapace 

 appears rather flattened dorsally. 



Cervical (jroove deep, continuous on the sides. Anvhi about half as long as an- 

 terior section of carapace (including rostrum). Relation of (( :^; = 1 :0.40 to 0.55.^ 

 Areola rather broad, relation of /r : / = 1 : 4.0 to 5.4,'' with aljout 5 irregular rows of 

 punctures. 



Rostrum long and broad, reaching to the middle of the fifth joint of the peduncle 

 of the antenna, and to the end of the peduncle of tlie antennula. rarely slightly 



3G= vertical diameter at gastric region; /f= transverse diameter at hepatic region; 7? = transverse diameter at 

 branchial region. 



*a^ anterior, p = posterior section of carapace. 

 5 10 = width, I = length of areola. 



