171 
sex. The extremes are represented by No. 57845, Tehuantepec, Mexico, 
and No. 40394, Nicaragua. In the former, the middle band is less than 
an inch wide, while the terminal one is so abraded that only traces of 
it are discernible on some feathers; on the inner webs, there are three 
indistinct narrower bands anterior to the main one, but of these there 
is no trace on the outer webs. In the other specimen, the main tail- 
band is over two inches wide on the intermedia, gradually narrowing 
to about one inch on the lateral pair; anterior to this, there are two or 
three narrow, badly-defined, white bands on the inner webs, as in the 
Nicaragua specimen ; the terminal band is about half an inch wide. 
As in U. zonura , there is much difference in the amount of glaucous 
or chalky cast to the plumage in different individuals, but it is nearly 
always very conspicuous in certain lights. There is also much varia¬ 
tion in the amount of the rusty spotting on the secondaries, this some¬ 
times showing conspicuously on the outer webs, even in the closed 
wing (as in Nos. 17785 and 54030), while again (as in most Central 
American and Mexican specimens) it is almost wanting even on the 
inner webs. 
Mauy adult specimens have white filamentous attachments to the tips of 
the shafts of the tibial plumes, and feathers of the chin, throat, and 
cheeks, like those observable in the type of Onychotes gruberi.. 
There are no specimens from south of Panama now before us for 
comparison with northern ones, but examples from the Isthmus are 
similar to those from Mexico. 
List of specimens in United States National Museum. 
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52823 
54030 
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58777 
58959 
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Locality. 
Rio Atrato, New Granada. 
Punta Arenas, Costa Rica. 
Mirador, Eastern Mexico. 
Colima, Western Mexico. 
Mazatlan, Western Mexico. 
Costa Rica. 
Orizaba, Eastern Mexico. 
Acajutla, Central America. 
Mexico. 
Costa Rica (San Jos6). 
Rio de Coahuyana, Western Mexico. 
Nicaragua. 
Costa Rica (Angostura). 
Orizaba. 
Mirador. 
Mazatlan. 
San Bias, Western Mexico. 
Mazatlan. . 
Panama. 
Puna Island, Guayaquil, Ecuador 
Tehuantepec, Southern Mexico... 
.do. 
.do. 
Mazatlan. 
Tehuantepec... 
Acajutla Central America. 
Costa Rica, (Talamanca). 
..do. 
Costa Rica (Old Harbor). 
Tehuantepec. 
Costa Rica (Talamanca). 
.do. 
.do. 
.do. 
..do. 
Date. 
July 3,1858 
Feb. —j 1863 
Mar. 14,1863 
Mar. 11,1863 
Sept. 
Mar. 30,1865 
Nov. —,- 
—,1862 
Feb, 1,186S 
Jan. 25,1869 
Doc. 30, 1868 
May 30,1869 
Aug. —, 1863 
- —,1873 
- —, 1873 
July 14, 1874 
April 3,1872 
Donor. 
Dr. A. Schott. 
O. Salvin. 
Dr. C. Sartorius. 
J. Xantus. 
Col. A. J. Grayson. 
Dr. A. von Frantzius. 
Prof. F. Sumichrast. 
Capt. J. M. Dow. 
Verreaux. 
Dr. von Frantzius. 
J. Xantus. 
Holland. 
J. Carmiol. 
Professor Sumichrast. 
Dr. Sartorius. 
Colonel Grayson. 
Do. 
Do. 
McLeannan. 
J. F. Reeve. 
Prof. F. Sumichrast. 
Do. 
Do. 
Colonel Grayson. 
Professor Sumichrast. 
Captain Dow. 
Prof. W. M. Gabb. 
Do. 
Do. 
Professor Sumichrast. 
Professor Gabb. 
Do. 
Do. 
Do. 
Do. 
Other specimens examined— In mus. Pliilad, Acad., 4; Boston Soc., 5 : Am. Mus., N. 
Y., 1; G. N. Lawrence, 3; total, 48. 
