ZOOLOGY. 695 
States east of the Mississippi, and altogether wanting in most of the 
states. Very abundant in the West, there supplanting the crows.” 
In the present case it would seem that the raven preoccupied the 
ground, excluding rather than supplanting the other species. The 
disappearance of the raven could not be owing to the wholesale 
and wanton slaughter so often practised by settlers upon the ani- 
mals occupying the lands upon which they locate, for it was seldom 
that a specimen was shot. They were regarded as quite inoffen- 
sive, never being known to commit any depredations upon grain 
fields, and were allowed to range unmolested. It is quite probable 
their departure was owing to the increasing number of settlers, 
the opening up of fields, and other changes incident to new set- 
tlements. 
Another example of the migration and succession of species 
was that of the four-lined squirrel (Tamias quadrivittatus). This 
sprightly little animal was very common, being seen everywhere 
through the forests and around settlements, while not a single 
specimen of the common striped squirrels or chipmunk (Tamias 
striatus) appeared anywhere in the region. 
Other species of squirrels were very common, the red fox, 
gray and black squirrels, and especially that pest of farmers, the 
striped gopher (Spermophilus lineatvs), were everywhere abun- 
dant. I well remember the first specimen of a chipmunk which I 
saw after two or three years residence in that section. I met him 
about five miles in the direction of Fox river on his emigrating 
tour northward. He had taken up his temporary residence under 
the roots of an old stump, on the top of which he was perched 
uttering his characteristic * chip” a note which the other species 
never produce. He was soon followed by numerous others and 
the two species lived together for a while, as far as I could observe, 
without any discord. The four-lined squirrels, however, soon be- 
came less numerous and in a short time were so scarce that it was 
difficult to obtain specimens and they have long since entirely 
disappeared from that region.— Moses Barrett, M. D., Milwaukee, 
isconsin. 
Norges on Two LITTLE-KNOWN BIRDS OF THE UNITED STATES. 
—Baird’s bunting (Centronyx Bairdii) is the most abundant and 
characteristic species along the northern border of Dakota, be- 
tween the Pembina and Turtle Mountains—in some places out- 
