362 MEMOIRS OF THE CARNEGIE MUSEUM 
General color, olive-green (Ridgway, 1886, X, 18), sides of carapace cream-color 
(VI, 20). A rufous (IV, 7) spot on anterior margin of carapace. Lower side 
whitish. Anterior half of abdominal segments hazel (I1V, 12). Chelee olive-yellow 
(VI, 16), mottled with olive-green. Finger tips orange (VI, 3), followed proximally 
by a citron-yellow (VI, 15) band. One rufous articular tubercle above on the hand. 
Articular membranes of hand luke-red (VII, 2). Finger tips of chelee of second and 
third pereiopods, and dactylopodites of fourth and fifth pereiopods orange. Pereio- 
pods pale brownish-white, mottled and marbled with olive-yellow. Antennal flag- 
ellum annulated olive-green and ochraceous (V, 7). Spines on sides of carapace and 
rostrum buff (V, 18). Antennal scale olive-yellow, its center olive-green. 
It is to be remarked that in this specimen no dark olive-green band is found 
near the finger-tips. The same was the case generally in specimens from Temple 
Creek, Albion, and from Elk Creek (all collected in autumn). However, specimens 
from Conneautville Station, Crawford County, collected in June, generally had a 
dark green, almost black band, succeeding the pale band. A similar dark band 
appeared in some of the Temple Creek specimens, after they had been preserved 
for some time in alcohol, but it disappeared again with the progress of the bleach- 
ing action of the preserving fluid. In collecting the specimens of this species and 
of C. obscuwrus- in Erie County in October, 1904, I was generally able to distinguish 
the two species, where they were found associated, by the color of the finger tips. 
However, too much reliance should not be placed upon this character, since I was 
not subsequently able to test this observation. 
The description of this species, as given above, is drawn from sixty-one speci- 
mens preserved in the collection of the Carnegie Museum. Of these, fifty-three are 
from the State of Pennsylvania (forty-eight from streams flowing into Lake Erie, 
five from the lake itself). One specimen is from Lake Erie, Erie County, Ohio, and 
seven are from the northern parts of Michigan. 
DISTRIBUTION (see Plate XLII, Fig. 3). 
LOCALITIES REPRESENTED IN THE CARNEGIE MUSEUM. 
Pennsytyanra: Hrie County, Lake Erie, Presque Isle, (D. A. Atkinson coll.) ; 
Lake Erie, Miles Grove; Walnut Creek, Swanville; Elk Creek, Girard; Elk Creek, 
Miles Grove; Conneaut Creek, Albion; Temple Creek, Albion; Crawford County, 
tributary of Conneaut Creek, Conneautville Station. 
Onto: Erie County, Lake Evie, Cedar Point, near Sandusky, (O. E. Jennings 
coll.). 
Micuiean: Emmet County, Crooked Lake, Oden near Petoskey, (E. B. William- 
son coll.). 
