356 MEMOIRS OF THE CARNEGIE MUSEUM 
There is a brown (chestnut, [V, 9) spot on the anterior margin of the carapace on 
each side below the eyes, not noticed by Faxon. The brown bands of the abdomen 
are burnt sienna (1V, 6). In the middle of the abdomen the epimera are hazel (IV, 
12). ‘The color of the finger tips is ferrugineous (1V, 10), often paler, the preceding 
band is dark olive-green, often almost black. The articular tubercles on the lower 
side of the hand are tawny (V, 1), on the upper side they are dark-green. 'The 
articular membranes of the chelee are wine-purple (VIII, 15). The darker green of 
the carapace is generally confined to distinct large blotches, symmetrically disposed ; 
one pair on the gastric region, and one each on the anterior and the posterior part 
of the branchial regions. Often the two blotches of the gastric region run together, 
which may also be the case with those of the branchial regions. They often appear 
spotted or mottled with the lighter, or rather more brownish (tawny olive), ground 
color. The brown spot on the anterior margin of the carapace is sometimes indis- 
tinct, and in young specimens with fresh shells, it may have a trace of yellow 
below. All these colors are bright and distinct only in fresh shells. On old shells, 
a coat of mud is generally deposited, giving to the whole body a dirty blackish 
color, and besides, the colors themselves fade considerably, so that only a dirty olive- 
green remains, with some brown on the abdomen. . 
The color of newly laid eggs under the abdomen of the female is olive-green (X, 
18). 
The above description is founded upon the examination of one hundred and 
twenty-one specimens, now preserved in the collections of the Carnegie Museum. 
Fifty-six of these specimens are from the state of Pennsylvania, fifty-four from 
New Jersey, eight from Maryland, and three from West Virginia (Potomac River 
at Cherry Run, Morgan County). This, however, does not represent the total num- 
ber of specimens seen by the writer, since many others were collected by him, as 
well as seen in the collections of the Department of Agriculture of Pennsylvania, of 
the Academy of Natural Sciences in Philadelphia, and of Oberlin College. 
DISTRIBUTION.’ 
LOCALITIES REPRESENTED IN THE COLLECTIONS OF THE CARNEGIE 
MUSEUM. 
PrnnsyLvanta: Bucks Co., Delaware River, New Hope; Delaware River, Penns 
Manor; Little Neshaminy Creek, Grenoble; Common Creek, Tullytown; Phila- 
delphia Co., Delaware River, Torresdale Fish Hatchery, Torresdale; Delaware 
7 All localities without further record have been ascertained by the writer in person. In other cases the authority 
(when published ), or the collector and institution, where the specimens are preserved, is given. 
