110 FRESH-WATER FISHES OF NEW JERSEY. 
spoken of we know of one or two creeks that are annually 
visited by a few of these herring, and have occasionally seen 
several bushels hauled from the deep holes in the creeks they 
had entered. They appear in the Delaware early in March, 
before the other representatives of the Clupeide do, and as 
they are not ever taken in very great numbers, as are the- 
other herring in the river, we judge that the immense quan- 
tities occasionally taken in creeks, is to be explained in the 
suggestion that those that come in the spring do not return. 
We have seen them in mid-winter frozen to death, appar- 
ently, and have reason to believe that they bury themselves 
in the mud when they take up their winter quarters in creeks 
and ponds. 
The specimens we first met with, and described as Cha- 
toéssus insociabilis, were from the pond referred to, stocked 
in 1857. They were different in coloration from the same 
fish as found on the coast and in the Delaware, and appeared 
to be distinct. If these Dorosome are left to themselves, un- 
visited by others later from the coast, will they in time be- 
come so far changed by the change in their surroundings as 
to be a different species? We thought them distinct in 1860, 
and the .Dorosoma, from this same pond, is a different 
looking fish now, in 1870, from what it was then. The dif- 
ference being one of color only it suggests the question as 
to whether the character of the water influences the charac- 
teristic coloring of species? 
The Chub (Semotilus rhotheus and S. corporalis). In all 
the tributaries of the Delaware, as well as in the river itself, 
“chub” abound. There are several points in their history that 
we cannot fully understand when reading what has been pub- 
lished of the two species, especially “Cope’s Monograph on 
the Cyprinidz of Pennsylvania." This author very correctly 
gives the Delaware as the locality of the Semotilus rhotheus, 
and admits the presence of S. corporalis. Now in the Del- 
aware, at Trenton, "chub" are very abundant, as we de- 
scribed them in 1861, which description Cope says is his S. 
