171 



sex. The extremes are represented by No. 57845, Tehiiantepec, Mexico, 

 and No. 40394, Nicaragua. In the former, the middle band is less than 

 an inch wide, Avliile the terminal one is so abraded that only traces of 

 it are discernible on some feathers; on tlie 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 intermedin, 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 baud is about half an inch wide. 



As in U. sonura, 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 amountof 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 aluiost wanting even on the 

 inner w^ebs. 



Many 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. 



Locality. 



Date. 



Donor. 



17785 

 22405 

 27101 

 29:W3 

 29326 

 30411 

 30539 

 30.540 

 32970 

 33203 

 35058 

 40394 

 41247 

 41781 

 42072 

 50768 

 50769 

 52823 

 54030 

 54110 

 57845 

 57861 

 57862 

 58777 

 58959 

 59003 

 64950 

 64951 

 66329 

 67283 

 67879 

 67880 

 67881 

 67882 

 67883 



285 



156 



41 



138 



cT ad, 



159 

 2010 



d" ad, 

 cfjuv, 

 — ad, 

 d" ad, 

 — juv, 

 ?juv. 



9 juv. 

 — ad. 



d - 

 cT — 

 ? - 



763 



855 



563 

 515 

 349 

 764 

 702 



-JUV. 



d ad. 



juv. 



— ad. 



? - 

 d — 



563 

 199 



? ad. 

 9 - 



— ad, 



— ad. 

 cTJiiv. 

 d ad, 



— ad. 

 d ad. 

 d ad. 

 9iuv. 

 ?juv. 



Kio Atrato, Ifew Granada 



Punta Arenas, Costa Rica 



Mirador, Eastern Mexico 



Colinia, Western Mexico 



Mazatlan. Western Mexico 



Costa Rica 



Orizaba, Eastern Mexico 



Acajutla, Central America 



Mexico , 



Costa Rica (San Jos6) , 



Rio de Goahuyana, Western Mexico. 



Nicaragua 



Costa Rica ( Angostura) 



Orizaba 



Mirador 



Mazatlan 



Sau Bias, Western Mexico 



Mazatlan 



Panama 



Puna Island, Guayaquil, Ecuador ... 



Tehnantepec, Southern Mexico 



do 



do 



Mazatlan 



Tehnantepec , 



Aca.i utla Central America , 



Costa Rica, (Talamanca) 



do 



Costa Rica (Old Harbor) 



Tehnantepec 



Costa Rica (Talamanca) 



do 



do 



do 



do 



July 3,1858 

 Feb.— '1863 



Mar. 14, 1863 

 Mar. 11,1863 



Sept. — , 



Mar. 30, 1865 



jSTov. — , 



— , 1863 



Feb. 1, 1865 

 .Jan. 25, 1869 

 Dec. 30, 1868 



May 30, 1869 

 Aug.— ,1863 



,1873 



— , 1873 



July 14, 1874 

 April 3, 1872 



Dr.A.Schott. 



O. Salvin. 



Dr. C. Sartorius. 



J. Xantns. 



Col. A. J. Grayson. 



Dr. A. von Frantzius. 



Prof. F. Sumichrast. 



Capt. J. M. Dow. 



Verreaux. 



Dr. von Frantzius. 



J. Xantns. 



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. 

 Profes.sor Sumichrast. 

 Professor Gabb. 



Do. 



Do. 



Do. 



Do. 



Other specimens examined. — lu nius. Philad. Acad., 4; Boston Soc, 5: Am. JIus., N. 

 Y., 1 ; G. N. LawreDce, 3; total, 48. 



