88 [May, 
5. CampBarus rusticus, Girard.—Rostrum narrower than in both C. affinis 
and C. Pealei, and besides, concave on the sides. Terminal point shorter than 
in either of the preceding species; anterior pair of abdominal legs (in the male) 
elongated, slender, with their tip curved inwards, whilst the same tips are 
straight in C. afinis, and twisted in C. pellucidus. The dorsal area is broader 
than in C. Pealez. 
Locality.—The Ohio, at Cincinnati. 
6. CampBarvs Propinquus, Girard.—Closely allied to C. afints, from which 
it differs, as well as from C. Peale, by a proportionally shorter rostrum, and 
from C. rusticus by a much broader one. The area between the dorsal sutures 
of the carapace is still broader than in either C. afinis, C. Pealei or C.rusticus. 
There are also differences in the structure of the anterior pair of abdominal legs 
of the male. 
Localities.—Lake Ontario, four miles from the shores, opposite to Oswego, 
found in the stomach of Lota maculosa ; Garrison Creek, Sackett’s Harbor ; 
Four-mile creek, Oswego (Baird). 
7. CamBarus Fossor, Girard.—Astacus fossor, Ravin. Amer. Month. Mag. ii. 
1817, 42. 
This species we have not seen, but if Rafinesque’s description is correct, 
‘«¢ rostrum short, one toothed on each side,”’ there can be no hesitation in referring 
it to this group. He further states that its ‘vulgar name is « burrowing lobster,”’ 
and that ‘*it burrows in meadows and mill-dams, which it perforates and da- 
mages.”? This would indicate habits similar to a species of the second group, 
which we describe hereafter, under the name of C. diogenes. We cannot help, 
however, from expressing some apprehension that on the examination of au- 
thentic specimens from the same localities whence Rafinesque had obtained his, 
the rostrum should be found without lateral tooth, in which case the C. fossor 
might not differ from our C. diogenes. 
Localities.—Virginia, Pennsylvania and New York (Rafinesque.) 
Second growp.—Rostrum generally broad, conical and short, with margins 
entire and toothless, terminated anteriorly by an acute and comparatively short 
point. Anterior pair of abdominal legs (in the male) recurved on their extremity, 
the tip of which is rounded. 
8. Camparus Barront, Erich. Arch. f. Naturg. 1846, I, 97. 
Astacus Bartonii, Fasr. Ent. Syst. Suppl. 407.—Latr. Gen. Cr. and Ins. v, 
240.—Bosc, Hist. Nat. Cr. II, 62, pl. Il, fig. 1.—Say, Journ. Acad. Nat. Sc. 
Philad. I, 1817, 167 and 443.—Harw. Med and Phys. Res. 1835, 230, fig. 3.— 
Gounp, Rep. Inv. Mass. 1841, 330.—Dr Kay, N. Y. Fauna VI, 1844, 22, pl. 
vill. fig. 25. . 
Astacus etliarts, Ravin. Amer. Month. Mag. II, 1817, 42. 
Localities.—-Foxburg, Carlisle and Berwick (Pa.); New York (De Kay); Mas- 
sachusetts (A. A. Gould). Brooks near Fishkill, Newburg, &c. (Rafinesque.) 
9. Camparus carouinus, Erich. Arch. f. Naturg. 1846, I, 96. 
Astacus affinis, M. Epw. Hist. Nat. Cr. Il, 332. 
Localities.-—Carolina (Erichson); Anderson, 8S. C. 
10. CamBaRUSs MONTANUS, Girard.—Antenne more elongated and more fili- 
form than in C. Bartonii. Rostrum intermediate in shape between the latter 
and C. carolinus, being proportionally‘longer than in C.Bartonzi and shorter and 
less tapering than in C. carolinus. Dorsal sutures of the carapace more apart 
than in both of the latter species. 
Localities. —Within the Alleghany ranges in Virginia and Maryland: tributaries 
of James river in Rockbridge Co. (Va.); Shenandoah river in Clarke Co. (Va.), 
and Cumberland (Md.) of the hydrographical basin of the Potomac; Sulphur 
Spring, Greenbrier river, an affluent of Kenhawa river (Va.) of the Ohio basin. 
11. CampBarus pIocENEs, Girard.—Rostrum proportionally the most elongated 
and the most conical amongst all the species of this group. Dorsal lines of 
