386 CRAYFISHES. 
CAMBARUS BARTONII MONTANUS (Girard). 
In looking over any extensive collection of Cambarus bartonii from the Alle- 
ghany Mountain region of Virginia and West Virginia one is struck by the 
tendency of the material before him to fall into two sets of forms, one character- 
ized by a rather narrow areola, sparsely sown with impressed points or dots 
which incline to a serial arrangement in three or four longitudinal rows; while 
in the other set the areola is shorter and proportionally broader, and its field 
is thickly strewn with innumerable dots. On further examination it will be 
seen that the narrower areola usually goes with a shorter and broader rostrum, 
a more depressed and oval carapace and a narrower antennal scale. These two 
forms are often found in the same locality and with these alone in view one might 
be justified in deeming them two well-differentiated species, but it soon becomes 
clear that in other places specimens are found that combine in a most perplexing 
fashion the features of our two supposed species. 
The second of the two forms above noticed, the one with the shorter and 
broader and more thickly punctate areola and longer rostrum is the one too 
curtly diagnosed by Girard under the name of Cambarus montanus. 
Girard’s description of C. montanus is as follows:— ‘‘ Antenne more elon- 
gated and more filiform than in C. Bartonii. Rostrum intermediate in shape 
between the latter and C. carolinus, being proportionally longer than in C. Bar- 
tonii 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 the Kenhawa River 
(Va.) [now W. Va.] of the Ohio basin.” 
When Dr. Hagen was preparing his Monograph of the: North American 
Astacidae in 1868, he had the opportunity to examine one of Girard’s types of 
C. montanus from Greenbrier River, W. Va., sent to him by Wm. Stimpson who 
then had the types from the Smithsonian Institute in Chicago, where in 1871 they 
were most unfortunately destroyed by the disastrous conflagration of that year. 
Sixteen years later, while I was revising the Astacidae, I had the advantage 
of close personal intercourse with Dr. Hagen and free use of his notes and memo- 
randa. The identity of Girard’s Cambarus montanus is thus assured by an 
unbroken tradition. Neither Dr. Hagen nor myself in my earlier publications 
esteemed this form worthy of even a subspecifie name, although its characters 
