332 U. S. P. R. R EXP. AND SURVEYS — ZOOLOGY — GENERAL REPORT. 
quill is longest ; the third, fourth, and first, successively, shorter. The tail is slightly emar- 
ginate ; the lateral feathers very little shorter. The ash color of the crown does not extend 
beyond the occiput. The sides of the head and neck are lighter olivaceous than the hack. The 
space around the lower eyelid is very little paler. The sides of the body are light olivaceous 
green ; the under wing coverts and axillaries sulphur yellow. There are no whitish edgings 
whatever on the wings and tail ; externally they are margined with the green of the hack ; the 
inner margins of the tail feathers similar, but lighter. There is no indication of a line of black 
feathers on each side of the chin. 
Specimens from Texas are smaller, but otherwise similar. The female is smaller than the 
male. 
There is a slight difference in the colors of the under tail coverts. These, sometimes, are 
almost entirely white, at other times with decided tinge of greenish yellow, as in 7570. In 
no North American specimens before me, however, are there any of the characters of Vireo 
bartramii, as given by Swainson. The proportions of the quills vary somewhat ; the first quill 
sometimes equal to and sometimes a little shorter than the fourth, but it is always decidedly 
longer than the fifth. The second and third quills are generally nearly equal ; the former is 
sometimes the longer. 
List of specimens. 
Catal. 
No. 
1418 
1135 
1140 
4325 
6847 
5650 
7510 
7511 
6814 
6815 
6813 
8049 
Sex. 
3 
3 
Q 
Locality. 
When collected. 
Whence obtained. 
Orig. 
No. 
Collected by — 
Length. 
Stretch 
of wings. 
Wing. 
Carlisle, Pa 
May 1, 1844 
May 3, 1844 
S. F. Baird 
6.33 
6.50 
6.00 
10. 25 
10. 50 
9.75 
3. 33 
3. 50 
2. 17 
do 
do 
do 
W. S. Wood 
Independence, Mo 
do 
Wm. M. Magraw. 
do 
74 
106 
Dr. Cooper 
do 
6. 25 
5. 90 
9.90 
9. 60 
3. 50 
3. 00 
do 
3 
Devil's river, Texas.. 
Col. J. D. Graham 
16 
J. H. Clark 
6. 00 
9.50 
2.75 
VIREO FLAVOVIRIDIS, Cassin. 
Vireosylvia flavoviridis, Cassin, Pr. A. N. Sc. V, Feb. 1851, 152.— Ib. VI ; pi. ii. (Panama.) 
Sp. Ch. — Second and third quills decidedly longest — equal ; first about intermediate between fourth and fifth, but considerably 
longer than the latter. Above very light yellowish green. The sides of the body greenish yellow, in strong contrast to the 
almost pure white of the under parts. The under tail and wing coverts and axillaries bright sulphur yellow. Crown ash color, 
bordered on either side by a brown line, below which is a bluish gray line from the bill over the eye to the side of the occiput ; 
a dusky line from the bill through and behind the eye. Length, 6 inches ; wing, 3.25. 
Hab. — Northeastern Mexico to Panama. 
This species is of the same size with and somewhat similar to V. olivaceus, but may be readily 
distinguished by the much brighter and more sulphur green colors of the upper parts ; the 
