244 



U. S P E. E. EXP AND SUEVEYS — ZOOLOGY — GENERAL EEPOET. 



In this species the wings are short and broad ; the tertials in the closed wing longer than 

 the secondaries, and about .45 of an inch shorter than the primaries ; the wing considerably 

 rounded, the first quill intermediate between the fourth and fifth, the second longest. The tail 

 is moderately graduated, the lateral feathers .15 of an inch shorter than the middle one. 



It is quite possible that in the full plumaged male the entire throat may be black, as there 

 is a tendency to this in some specimens. A fall male (1697) shows the black only on the fore 

 breast. 



Authors describe the black feathers of the throat as crenulated (margined) with white. I 

 have never seen any specimens (out of about twenty) in which these margins were other than 

 ash color. 



The mourning warbler is very similar to the Oporornis agilis, and is only to be distinguished by 

 the smaller size, much shorter, and more rounded wings, longer legs, and shorter toes, and other 

 generic characters. The adult males are easily separated by the decided black of the throat 

 and absence of white ring round the eye in G. Philadelphia. The females are much more closely 

 related, both having the pale ring round the eye. The longer and more pointed wings of 

 agilis will distinguish them ; the relations to O. macgiUivrayi will be pointed out under that 

 species. 



A female (2906) has a strong tinge of buff yellow on the throat. 



List of specimens. 



GEOTHLYPIS MACGILLIVKAYI, Baird. 



Macgillivray's Warbler. 



Sylvia macgiUivrayi, Addubon, Orn. Biog. V, 1839, 75 ; pi. 399. {Sylvia Philadelphia on plate.) 



Trichas macgiUivrayi, Aud. Syn. 1839, 64. — Is. Birds Amor. II, 1841, 74 ; pi. 100. 



Sylvia tolmioei, Townsend, J. A. N. Sc. VIII, 1839, 149, 159. (Read April, but the volume really not published 



till 1840.) 

 Sylvia tolmiei, Townsend, Narrative, 1839, 343. 

 Trichas tolmiaei, Nuttall, Man. I, 2d ed., 1840, 460. 



Sp. Ch. — Head and neck all round, throat and fore part of the breast dark ash color ; a narrow frontlet, loral region and space 

 round the e^e (scarcely complete behind) black. The eyelids above and below the eye (not in a continuous ring) white. The 

 feathers of the chin, throat, and fore breast really black, with ashy gray tips, more or less concealing the black. Rest of upper 

 parts dark olive green, (sides under the wings paler ;) of lower, bright yellow. Female with the throat paler and without any 

 black. Length of male, 5 inches ; wing, 2.45 ; tail, 2.45. 



Hah. — Pacific coast of North America, south to Gulf of California and across to Monterey, Mexico. In Rocky mountains to 

 Fort Laramie .' (Dr. Cooper.) 



