570 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Dendroeca peridentalia (typographical error) Cooper, Ain. Nat., iii, Nov., 1869, 



480, footnote (Colorado Valley, California, May 27). 

 Dendroeca chrysoparia (not of Sclater and Salvin, 1860) Sclater, Proc. Zool. Soc. 



Lond., 1862, 19 (La Parada, Oaxaca) ; Cat. Am. Birds, 1862, 358 (do.). 

 Dendreeca niveiventris, Salvin, Proc. Zool. Soc. Lond., 1863, 187, pi. 24, fig. 2 



(San Ger6nimo, Guatemala; coll. Salvin and Godman). 



DENDROICA RARA (Wilson). 

 CERULEAN WARBLER. 



Wing less than 69; crown blue or greenish blue; auricular region 

 blue or olive. 



Admit male {all seasons). — Above grayish blue, brighter on the 

 pileum, where approaching cerulean or azure; sides of hinder crown 

 and occiput streaked with black, sometimes suffused into lateral 

 patches; back and scapulars more or less broadl}"- streaked with black; 

 upper tail-coverts black, margined with grayish blue or bluish gray; 

 wings and tail black with grayish blue edgings, the middle and greater 

 coverts broadly tipped with white, forming two conspicuous bands; 

 the inner webs of rectrices with a subterminal patch of white, largest 

 on outermost; sides of head grayish blue, relieved by a more or less 

 distinct postocular streak of dusky, this often margined above by a 

 more or less distinct (sometimes conspicuous) supra-auricular streak 

 of white; malar region and under parts white, the sides and flanks 

 broadly streaked with dusky (more or- less suffused, especially on sides 

 of breast, with grayish blue), the chest usually crossed by a narrow 

 band of blackish, more or less suffused with grayish blue, this band 

 often interrupted in the middle, sometimes wanting; maxilla black, 

 mandible grayish dusky (grayish blue in life); iris brown; legs and 

 feet brownish dusky in dried skins; length (skins), 102.9-115.6 (110.5); 

 wing, 62-67.6 (65.5); tail, 43.2-47.7 (45); exposed culmen, 9.4-^10.2 

 (9.9); tarsus, 15.7-17 (16.5); middle toe, 9.9-10.4 (10.2).' 



Adult female {all seasoiis). — Above varying from light bluish gray 

 to grayish olive-green, the pileum brighter (grayish glaucous-blue to 

 sage green), entirely unstreaked; wings and tail as in adult male, but 

 edgings light greenish or olive-grayish instead of bluish; a more or 

 less distinct whitish or pale yellowish superciliary stripe; auricular 

 region grayish or grayish olive-green, darker along upper margin, 

 somewhat streaked with whitish or pale yellowish anteriorly; under 

 parts dull white, usually more or less suffused with pale yellow (some- 

 times strongly so), especially on sides of neck and across chest; length 

 (skins), 104-110.5 (107.7); wing, 58.2-62.7 (61.2); tail, 41.1-42.7(42.4); 

 exposed culmen, 9.9-10.4 (10.2); tarsus, 15.5-17 (16.3); middle toe, 

 9.4-10.4 (9.9).' 



' Seven specimens. 



