TO YELLOWSTONE NATIONAL PARK. 73 
must confess to having experienced a ludicrous feeling of astonishment the first time I saw the 
bird walk unconcernedly down a sloping rock until its head disappeared under the water. It 
repeated this performance several times, occasionally rising to the surface as if forced up by the 
water, and then immediately diving again. When carried down a few yards by the force of the 
current, it would fly a short distance up the stream and dive from the wing. 
With the help of a good glass I saw from the top of the cafion two of these little birds flying 
about over the river where it boiled and surged along below the Lower Falls. 
SAXICOLID. 
7. SIALIA ARCTICA, Sw. 
AROTIC BLUEBIRD; WESTERN BLUEBIRD. 
One of the most abundant birds in the wooded region through which we passed. 1t was espe- 
cially numerous in the Yellowstone Park late in August and early in September, when it formed a 
large division of the army of small birds that were being constantly started from the ground. 
PARIDZ. 
8. PARUS ATRICAPILLUS SEPTENTRIONALIS, (Harris) Allen. 
LONG-TAILED CHICKADEE. 
Common along the Missouri River and in the mountains. 
9. PARUS MONTANUDUS, Gamb. 
MOUNTAIN CHICKADEE. 
A few birds of this species were seen searching for food among the pines that grow among 
the Bad Lands near the mouth of the Judith River. In habits, they seemed to resemble closely 
the preceding species; but the note was slightly different, being more slowly uttered, almost drawled 
in fact. 
SITTID. 
10. SITTA CAROLINENSIS ACULEATA, (Cass.) Allen. 
SLENDER-BILLED NUTHATCH. 
Common in the Yellowstone Park and in the mountains toward the Missouri River. 
TROGLODYTIDZ. 
11. SALPINCTES OBSOLETUS, (Say) Cad. 
Rock WREN. 
Very abundant in the Bad Lands along the Missouri and among the sandstone bluffs near the 
Judith Mountains. These birds were also common in the Little Belt Mountains near White-tailed 
Deer Creek, darting about among old stumps and wood-piles, just as they do among the bluffs of 
the Bad Lands. A nest found near Haymaker’s Creek was nothing more than a short burrow 
under a flat rock. The little chamber at the end contained three nearly full-grown young. 
12. TROGLODYTES AEDON PARKMANNI, (Aud.) Coues. 
WESTERN HOUSE WREN. 
Abundant on the Missouri near Bismarck. 
10 w 
