ORTMANN : THE CRAWFISHES OF THE STATE OF PENNSYLVANIA 369 
West Vireinta: Wetzel County, Fishing Creek, New Martinsville; Pleasants 
County, Middle Island Creek, St. Marys. 
PREVIOUS RECORDS. 
Type locality : Smoky Creek, Carter County, Kentucky (Faxon). 
Onto: Lorain County (Faxon); Vermilion River; Beaver Creek; French Creek 
(Ortmann); Wayne County, Killbuck Creek, Creston (Ortmann); Tuscarawas 
County, Tuscarawas River, Gnadenhtitten (Ortmann); Anox County, Big Jelloway 
Creek (Osburn and Williamson); Licking County (Williamson); Franklin County, 
Alum Creek (Osburn and Williamson). 
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3. CAMBARUS (Faxontus) opscurus Hagen. 
(Plate A, Fig. 1 and 2; Plate XX XIX, Fig. 7a-7e; Plate XL, Fig. 1.) 
Cambarus obscurus Hagen, 1870, p. 69, PI. 1, f. 72-75, Pl. 3, f. 154 ; Smith, 1874, p. 689; Faxon, 1884), p. 148; Faxon, 
1898, p. 652 ; Ortmann, 1905a, p. 402. 
Cambarus propinquus obscurus Faxon, 1885a, p. 92; Faxon, 1885), p. 360 ; Underwood, 1886, p. 372; Hay, 1899, p. 
960, 964. 
Cambarus propinguus and C. rusticus Williamson, 1901, p. 13. 
Cambarus ( Faxonius) obscurus Ortmann, 1905), p. 112. 
Body of the same shape as in C. propinquus, but slightly more robust in old 
specimens. 
Carapace similar to C. propinquus, but the width of the hepatic, as also of the 
branchial regions, is slightly greater; G:H:6B=1:1.1:1.3 to 1.5. These differ- 
ences of dimension may, however, be due to the fact that large individuals of this 
species are at hand. 
Cervical groove and areola identical with those of C. propinquus, but the areola 
generally is slightly longer than half of the anterior section of the carapace. 
Rostrum similar to that of C. propinquus, but always without any trace of a 
median keel. In young specimens the rostrum and its acumen are about identical 
in shape with those of C. propinquus. In older specimens there is a tendency to a 
shortening of the acumen, which often reaches only to the distal end of the second 
joint of the peduncle of the antennula and to the base of the terminal joint of the 
peduncle of the antenna. The marginal spines in old individuals are often very 
small and indistinct, represented by mere angles. The postorbital ridges are as in 
C. propinquus. 
The punctures and spines of the carapace are identical with those of C. 
propinquus. 
