262 
U. S. P. R R. EXP. AND SURVEYS— ZOOLOGY GENERAL REPORT. 
(2159.) It is especially noticable in jNo. 8020, from Guatemala. This is also of an unusually- 
dark olive above. 
The female differs only in being a little smaller, and perhaps in having the spots beneath 
more restricted. Autumnal and winter specimens are decidedly more sulphury yellow beneath, 
and the spots less sharply defined. Tbere is little variation in the size of bill and feet in individuals 
oftbe sa m e sex. 
It is somewhat a question whether the Seiurus sul/urascens of authors be not merely the winter 
plumage, as observed in South America. This conclusion can only be avoided by showing that 
the sulphur-bellied bird breeds in South America in this plumage. 
List of specimens. 
Catal. 
No. 
Sex and 
age. 
Locality. 
When 
collected. 
Whence obtained. 
Collected by- 
Length. 
Stretch 
ot'wings. 
Wing. 
Remarks. 
2668 
2531 
1501 
1502 
2434 
2159 
3317 
4304 
8669 
May 14, 1846 
Apl.30, 1846 
May 10, 1844 
May 10, 1844 
Sept. 8, 1845 
Apl. 28, 1845 
5.25 
6.25 
6.25 
6.16 
5.91 
5.50 
6.00 
9.33 
9.66 
9.83 
9.75 
9.41 
8.75 
9.50 
3.00 
3.50 
3.16 
3.08 
3.00 
2.75 
3.00 
3 
3 
3 
Q 
? 
Calcasieu Pass, La 
8 
Sept. 24, 1857 
Sept. 25, 1857 
3.00 
3.00 
3.00 
6.00 
5.25 
9.00 
9.50 
7358 
10169' 
4721 
4818 
8020 
Sept. 26, 1857 
Light brown legs, black eyes. 
3 
3 
Lieut. Warren.. .. 
6.12 
10.50 
3.12 
7639? 
SEIURUS LUDOVICIANUS, Bo nap. 
Large-billed Water Thrush. 
?? Turdus motacilla, Vieillot, Ois. Am. Sept. II, 1807, 9 ; pi. lxv. 
Turdus ludovicianus, Aud. Orn. Biog. I, 1832, 99 ; pi. 19. 
Seiurus ludovicianus, Bonap. List, 1838. 
Seiurus motacilla, "Bon ap. Consp. 1850, 306. (Not of Vieillot.) 
Henicocichla major, Cabanis, Mus. Hein. 1850, 16. (Xalapa.) 
g p q h gin longer than the skull. Upper parts olive brown with a shade of greenish. A conspicuous white superciliary line 
from the bill to the nape, involving the upper lid, with a brown one from the bill through the eye, widening behind. Under 
parts white, with a very faint shade of pale buff behind, especially on the tail coverts. A dusky maxillary line ; the fore part 
of breast and sides of body, with arrow shaped streaks of the same color. Chin, throat, belly, and under tail coverts entirely 
immaculate. Length, 6.33/, wing, 3.25 ; tail, 2.40 ; bill from rictus, .75. 
Hah.— Eastern United States to the Missouri. South to Mexico. 
This species may be readily distinguished from the S. noveboracensis by its larger size, 
especially of bill and tarsi, which are very conspicuously larger, the former especially. The 
color above is of perhaps a lighter olivaceous. The stripe over the eye, besides being more 
conspicuous, is, with the under parts, of a decided white, instead of brownish yellow; the spots 
beneath are paler and much fewer in number ; the chin and throat, the middle of the posterior 
portion of the breast, the sides of the body behind, and the under tail coverts, being entirely 
