310 
U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY-GENERAL REPORT. 
color extending a short distance around towards the nape. Rump light chestnut. Forehead 
and middle of belly brownish or dull yellow brownish white ; the upper part of the breast and 
the sides of the body light grayish brown. A large spot on the throat crossing the line of 
separation between the chestnut and brown, steel blue ; this sometimes seen in the chin. 
The lores and a very narrow line along the base of the bill are black. The feathers on the 
middle of the hack exhibit whitish edges, more or less conspicuously. Wings and tail brown, the 
secondaries with lighter margins. 
The female is not appreciably different in color. 
The young lacks the frontal band, and the gray collar on the nape is only faintly indicated. 
There is usually a good deal of white on the throat, on the lower part of which the black spot 
is more extended and less distinct than in the adult. 
Specimens vary in the extent of chestnut on the rump, in the width and precise shade of the 
frontal patch, &c. 
This species differs from the true Hirundo fidva, Yieillot Encyclop. 527, of the West Indies, 
in the larger size, lighter colored rump, and in the presence of a black spot on the throat. 
List of specimens. 
Caial. 
No. 
Sex and 
age. 
Locality. 
When col¬ 
lected. 
Whence obtained. 
Original 
No. 
Collected by— 
Length. 
Stretch 
of wings. 
Wing. 
443 
Aug. 31, 1841 
S. F. Baird. 
5.75 
12.50 
2358 
May 26, 1845 
5 92 
12 50 
4 50 
2284 
o 
May 17. 
5.67 
12.25 
4 42 
2617 
A 
May 11, 1846 
5.67 
12 25 
4.50 
1565 
O 
A 
May 22, 1844 
5.83 
12.08 
4.92 
685 
O 
Aug. 21, 1842 
1623 
V 
July 9, 1844 
5.92 
12.92 
4.33 
2616 
V 
May 11, 1846 
5.75 
12.33 
4.33 
6487 
Q 
. 
4776 
Lieut G. K. Warren ... 
5.87 
12 25 
4.50 
4777 
4778 
Q 
5.50 
12.25 
4.50 
477Q 
5.75 
12.25 
4.50 
4780 
Q 
5.75 
12.25 
4.50 
5508 
159 
W. S. Wood .. 
5.50 
4.75 
550 Q 
s 
158 
5.50 
4.50 
7070 
o 
July 22, 1857 
58 
4304 
A 
May —, 1855 
Dr. Suckley, U. S. A_ 
178 
5.62 
4.37 
6001 
A 
6000 
o 
A 
6023 
O 
May 8, 1855 
HIRUNDO BICOLOR, Yieillot. 
White-bellied Swallow. 
Hirundo bicolor, Vielliot, Ois. Am. Sept. I, 1807, 61; pi. xxxi.— Audubon, Orn. Biog. 1831,491; pi. 98.— Ib. Syn. 
1839, 35.— Ib. Birds Amer. I, 1840,175 ; pi. 46.— Cassin, Illust. I, 1855, 244.— Brewer, N. Am. 
Oology, I, 1857, 100 ; pi. iv, fig. 47. (Egg.) 
Tachycineta bicolor, Cabanis, Mus. Hein. 1850-’51, 48. 
Ilerse bicolor, Bonap. Conspectus, 1850, 341. 
Hirundo viridis, Wilson, Am. Orn. V, 1812, 49 ; pi. xxxviii. 
Hirundo leucogaster, Stephens, Shaw, Zool. X, 1817, 105. 
q h< _Glossy metallic green above ; entirely white beneath. Female much duller in color. Wing 5 inches. 
Length, 6.25 inches; wing, 5.00 ; tail, 2.65. 
Hah ,—North America from Atlantic to Pacific. 
