OCR Text |
Show 108 webs of primaries marked with transverse spots of white. Rest of plum age continuous plumbeous, inclining to pearl- gray or ashy- blue OQ the lower surface ( where the shafts of the feathers are usually conspicuously dai'ker), and on the upper parts becoming gradually lighter toward the nape, which is bluish- plumbeous, abruptly contrasted with the black of the pileum. Young:- Pileum brownish- black, bordered below by a continuous nuchal collar of unvariegated ochraceous. Best of upper parts plain blackish- sepia, unbroken by any exposed white markings, and scarcely relieved by the narrow faint tips of fulvous to some of the feathers. Tail black, narrowly tipped with white, and crossed by four to five narrow bands of grayish- brown or mixed brown and white; these bands more regular, continuous, and almost entirely white on the under surface. Lower parts entirely ochraceous or white, paler on the crissura, and without any markings, except an occasional dusky shaft- streak here and there. Auriculars black. Sexes alike in colors, but differing in size, as follows:- Male:- Wing, 8.00- 8.50; tail, 7.20- 8.00; culmen, 0.55- 0.00 ; tarsus, 2.25- 2.40; middle toe, 1.45- 1.50. ( Six specimens.) Female:- Wing, 9.50- 10.00; tail, 8. G0- 8.80; culmen, 0.70- 0.75; tarsus, 2.45- 2.70; middle toe, 1.60- 1.80. ( Five specimens.) The principal variations noticed among the few adults before us are quite trifling. The white of the lining of the wing and of the crissum is usually much clouded by a fine, irregular mottling of plumbeous; but in No. 61,363, 6*, from Yeragua, there is none of this mottling, while the shafts of the feathers are conspicuously black. In No. 16,573, 4, Panama ( Frijole), the usual blackish shaft streaks of the lower parts are almost obsolete. The plumbeous of the nape is also darker or lighter iu different individuals, producing thereby a variable abruptness of contrast with the black of the pileum. The young plumage varies more. Some are nearly pure white beneath, but a light ochraceous shade is the more usual color of the lower parts. In a young male, however ( 43,047), from Costa liica, the entire lower parts and the nuchal collar are deep tawuy- ochraceous, almost rufous on the breast and thighs. A young female from Costa Rica ( No. 39,733) is strikingly similar in all the details of coloration to the adult of Micrastur melano* leucus, even to the markings of the tail. The general form and the size, also, are so similar to the adult male of that bird that the generic characters ouly are different. List of specimens in United States National Museum, 6 A 1 3 « e 16573 " © A B O 35182; .. 39733 HOT 43047 17 473631 62127 3704 663331 11 67868 \" v K * . s 4 A S. 8. M. M M. S. S. s. "" J t& o « 9 1 •* M 1 < f ad. 9 9JIIV < f od. j cf ad. d- juv. 9 ad. Locality. Panama Railroad . . .. SAD Jose, Costa Rica Coata Rioa Costa Rica ( Turrialba) j C « « ra Rica Chiriqua Lipuno, Coata Rioa do When col-lee ted. Sept. 4,1664 Nov. -, 1863 July 17, 1866 July 30,1866 From whom received McL Carmiol. A. von Frantzitta ... J. Cooper Carmiol O. Salviu , W. M. Gabb i ... do Othtr specimens examined.- Mus. Phila. Acad., 5; Boston Soc., 2 ; G. N. Lawrence, 5; Americau Mus., N. Y., 1. Total, •<*!. |