236 
inclined to think that with the preceding species the Cassin’s Yireo retires in summer 
to more northern breeding-grounds. 
Ko. 
Sex. 
Locality. 
Date. 
Collector. 
376 
Q 
Tejon Mountains, Cal.... 
Aug. 17 
H. W. Hensliaw. 
HF 
43. Vireo solitarius, (Wils.), var. plumbeus, Coues.—Western Solitary Yireo. 
I procured a single specimen of this Yireo in the mountains near Fort Tejon, August 
1. It is in much-worn plumage, and probably had bred in this locality. 
The species is, however, one belonging more particularly to the Southern Rocky 
Mountains. 
Mb. 
Sex. 
Locality. 
Date. 
Collector. 
767 
$ ad. 
Tejon Mountains, Cal... 
Aug. 1 
II. W. Henshaw. 
44. Vireo pusillus, Coues.—Least Yireo. 
The Least Yireo was the most abundant of its tribe about Los Angeles in June, and 
their notes, remarkable only for their oddity and quaintness, were constantly heard 
issuing from the thickets, often several males singing at a time. The bird seems to be 
the counterpart of the eastern Vireo belli. It is never seen in the open, and very rarely 
in the taller, trees, but keeps within the shelter of the shrubbery, either along a stream 
or in the swamps. It is very active and restless, and, numerous as they were, I found 
it very difficult to get even a glimpse of them, as they flitted about, now just over the 
ground, now in the tops of the young trees, that grew so thickly as to limit my view 
to the space of a few yards. 
As far north as Santa Barbara and Fort Tejon they were quite numerous, and their 
range will very probably be found to reach as far north as San Francisco. 
No. 
Sex. 
Locality. 
Date. 
Collector. 
Wing. 
Tail. 
Bill. 
Tarsus. 
24 
cf ad. 
cf jam 
? jun. 
Los Angeles, Cal_... 
June 17 
H. W. Henshaw. 
2.12 
2. 25 
0. 41 
0. 72 
258 
Santa Barbara, Cal. 
July 7 
Aug. 7 
_do.. 
2. 08 
2. 22 
0. 38 
0. 77 
312 
Fort Tejon, Cal. 
_do. 
2. 07 
2. 05 
0. 42 
0. 74 
335 
.do. 
A i i it. 9 
_do. 
2. 20 
2.14 
0. 40 
0. 75 
45. Vireo huttoni , Cassin.—Hutton’s Yireo. 
Vireo huttoni , Cassin, Pr. A. N. Sc.Phila. v, Feb., 1851, 150.—Bel., B. N. A., 1858, 339.—Coop., B. 
Cal., i, 1870,121.—Coues, Key K. A. B., 1872,123.—B., B., & R., K A. B., i, 1874, 387. 
This species is one of the least known of all our Yireos; nor is this owing entirely to 
its rarity, for at Santa Barbara, in June, it was quite common, and according to Dr. 
Cooper this is true in other parts of California, it wintering plentifully as high as 
latitude 38°. It breeds, I am inclined to believe, through the whole of Southern 
California. 
In habits it is arboreal, as much so, judging from those I saw, as the Warbling Vireo. 
It frequented the oaks exclusively, and was at this season entirely silent, so that, 
though I watched them for the express purpose of listening to their notes, I heard not 
a single strain. This was probably due to the fact that their broods were just out and 
required their full attention. 
All their movements were marked with a quiet deliberation as they silently moved 
about the ends of the branches, searching them with the utmost care for food. 
No. 
Sex. 
Locality. 
Date. 
Collector. 
Wing. 
Tail. 
Bill. 
Tarsus. 
769 
$ ad. 
Santa Barbara, Cal. 
June 14 
II. W. Hensbaw. 
2.45 
2.15 
0. 43 
0. 76 
58 
cf ad. 
.do. 
June 25 
_do... 
2. 43 
2. 09 
0. 42 
0. 75 
109 
cf jun. 
.do. 
June 27 
__do ___ 
2. 35 
2. 10 
0. 39 
0. 73 
110 
? ad. 
.do. 
June 27 
_do. 
2. 38 
2. 04 
0. 43 
0. 73 
111 
cf ad. 
.do. 
June 27 
... .do. 
2. 29 
2. 07 
0. 42 
0. 76 
135 
cf jun. 
.do. 
June 29 
_do. 
2. 35 
2. 04 
0. 42 
0. 75 
152 
cf jun. 
.do. 
June 29 
.... do. 
2. 40 
2.12 
0. 43 
0. 73 
245 
? ad. 
.do. 
July 17 
..do.. 
2. 45 
2. 15 
0. 40 
0. 72 
