ORTMANN: THE CRAWFISHES OF THE STATE OF PENNSYLVANIA 393 
from northern individuals of the same size. The other characters incline 
toward the typical bartoni, while the shape of the carapace varies to the other 
extreme. 
A single male of the second form, about 60 mm. long, from Deer Park, Garrett 
County, Maryland, sent to me for examination by Dr. P. R. Uhler of Baltimore, was 
found under a lot of typical C. bartoni, (supposed to be C. diogenes). This male 
agrees fairly well with the specimens from Kentucky. The carapace is rather eylin- 
drical; there are no lateral spines on the carapace; the punctures of the areola are 
like those of C. bartoni; the chelee, which are unequal, and apparently both regen- 
erated, have rather distinct impressions on the upper surface, but the inner margin 
has only one row of tubercles. The rostrum is of the robustus-type. Thus, of the 
characters of robustus, only the shape of rostrum and the impressions of the chelee 
were present, all other characters being those of typical barton. 
Specimens possessing a rather elongated rostrum, but with the other characters 
of typical bartoni, I have seen associated with individuals of the typical form taken 
at Gettysburg, Adams Co., Pa. (Dep. Agric., Harrisburg) ; but these I have recorded 
with typical C. barton. (See above, p. 385.) 
It is very desirable that the southern form in Maryland, Virginia, Kentucky, and 
adjacent localities, should be investigated more closely. The records at hand, and 
the few, immature specimens the writer has seen, do not permit a final conclusion 
as to whether we have to deal in the south with a form differing from that in the 
north, or not. The same reason forbids us to restore our C. robustus to the rank of 
a species, which I surely would have done if the Pennsylvanian material alone 
were to be considered. 
In Pennsylvania ©. bartoni robustus is not always associated with C. bartoni. I 
found it thus in every case in Allegheny County, in Crawford County, and in War- 
ren County. In McKean County I found it associated with C. obscwrus in the Alle- 
ghany River at Larabee, but the typical C. bartoni was not there, although occurring 
not far away in small streams and springs. In Erie County C. barton was found 
only twice, in Elk Creek and Walnut Creek, associated with C. bartoni robustus, but 
then only a single individual of the former was found in each case. At Albion and 
Union City C. bartoni robustus alone was present, and I am sure of it, since I hunted 
for C. bartoni, but without success. The rich material from Northeast (forty-four 
specimens are now in the Museum, but many more were originally in the lot) did 
not contain a single C. bartoni. Thus it is beyond doubt that C. bartoni robustus is 
not infrequently found without the typical form, and chiefly so in the most northern 
and western sections of the state. 
