352 MEMOIRS OF THE CARNEGIE MUSEUM 
e’’, 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. ( Bartonius) diogenes Girard. 
C. Description and Distribution of the Species. 
1. CamBarus (Faxontus) Limosus (Rafinesque). 
(Plate B, Fig. 3; Plate XX XIX, Figs. 5a and 5b.) 
Astacus limosus Rafinesque, 1817, p. 4. 
Astacus affinis Say, 1817, p. 168 ; Harlan, 1835, p. 230, fig. 2; DeKay, 1844, p. 23; Gibbes, 1850, p. 195 (partim). 
Astacus bartoni Milne-Edwards, 1837, p. 331 (non Fabricius). 
Cambarus afinis Girard, 1852, p. 37; Hagen, 1870, p. 60; Pl. 1, figs. 19, 22, 84, 85, Pl. 3, fig. 152, Pl. 5; Abbott, 1873, 
p- 80; Smith, 1874, p. 638; Faxon, 1884), p. 146; Faxon, 1885a, p. 86; Faxon, 1885), 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. 
Cambarus ( Faxonius) limosus Ortmann, 1905b, p. 107, 112, 131. 
Body robust, pubescent all over, but chiefly so on carapace and chele; 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 chele. 
Carapace subovate, depressed, the depression being brought about by a bulging 
out of the branchial regions. The vertical height of the carapace, at a point about in 
the middle of the gastric region (measured from this point to a point on the sternum 
just in front of the first pereiopods), the vertical height of the carapace at a point of 
the areola directly above the sternum between the second pereiopods, and the great- 
est width of the carapace at the hepatic regions are about the same; while the great- 
est width of the carapace at the branchial regions is distinctly greater. Relation 
G:H:B=1:1:1.2toi4% 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 groove deep, continuous on the sides. Areola about half as long as an- 
terior section of carapace (including rostrum). Relation of a:p = 1:0.40 to 0.55. 
Areola rather broad, relation of w:] = 1:4.0 to 5.4,° with about 5 irregular rows of 
punctures. 
vostrum 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 the antennula, rarely slightly 
*G= vertical diameter at gastric region ; H = transverse diameter at hepatic region; B= transverse diameter at 
branchial region. 
‘a=anterior, p= posterior section of carapace. 
5 = width, length of areola. 
