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112 FRESH-WATER FISHES OF NEW JERSEY. 
half bury themselves, while the young of S. rhotheus are 
fond of and frequent always pebbly-bottomed, rapid brooks. 
To recapitulate, we have, in the Delaware River and its 
. tributaries, the Semotilus rhotheus in abundance, likewise 
the young in the directly tributary streams, equally nu- 
merous — and in eertain streams, some cut off from the 
river by dams, the fish described by Mitchell as Cyprinus 
atromaculatus, which reaches a length of six and seven 
inches, and presents a coloration of black, yellow, reddish 
and silvery, like no other fish of our waters. If these are 
the young of the Cyprinus corporalis of the same author, 
why have we not this latter fish in abundance also? But 
we have not. Again, in streams, as the Assunpink and 
Shabbaconk, which are cut off from the Delaware by dams, 
and in the Stony-brook and Mill-stone, which are eut off 
from the Rariton, we have Semotilus atromaculatus which 
never cease to be such. Do they die for want of the rivers 
to become the S. corporalis? If not, where are these larger 
chub? In Stony-brook and the Mill-stone we have also the 
SS. rhotheus, from half an inch to nearly half a yard in 
length. The difference in the scales of these two species of 
"ehub" render them distinguishable without reference to 
color; and the S. atromaculatus agree with the size and 
number of scales of S. corporalis, as given in the “Mono- 
graph of the Cyprinide of Pennsylvania," by E. D. Cope. 
We are not yet satisfied, however, that the atromaculated 
chub of the Delaware basin is the young of any other 
species. 
Roach (Stilbe Americana). Professor E. D. Cope in his 
Monograph says of this fish: “This Stilbe rarely exceeds 
seven inches in length." In the various streams in which we 
find the "roach," it is so frequent an occurrence to meet with 
them eight, nine, and nine and a half inches in length, that 
we are surprised at the figure mentioned by Cope as the 
maximum length. Otherwise his remarks accord with our 
observations. These large specimens have the pectoral, 
