434 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



shorter, and bill averaging slightly longer, and, perhaps, relatively 

 broader." 



Adult male.— Ijength. (skins), 127-137 (132); wing, 67.5-77 (72.4); 

 tail, 56-63.5 (60.1); exposed culmen, 11-12 (11.4); tarsns, 16-17 

 (16.6); middle toe, 9-10 (9.7).^ 



Advlt female.— Length, (skins), 122-135 (129); wing, 63-75 (69.2); 

 tail, 55-61 (60.5); exposed cnlmen, 10.5-11.5 (11); tarsus, 15-17.5 

 (16.1); middle toe, 8.5-10 (9.2). « 

 Panama (San Miguel Island, Bay of Panama). 

 Elsenia sordidata Bangs, Auk, xviii, Jan., 1901, 28 (San Miguel I., Bay of 



Panama; coll. E. A. and O. Bangs). 

 [Elainea] sordidata Sharpe, Hand-list, iii, 1901, 122. 



Elainea albivertex sordidata Thayer and B.\ngs, Bull. Mus. Gouip. Zool., xlvi, 

 Sept., 1905, 152 (San Miguel I.; crit.). 



EL.^NIA FRANTZII FRANTZII Lawrence. 

 FRANTZIUS' EL.a:NIA. 



Adults (sexes alike). — Above plain brownish olive, the center of 

 crown rarely with a few white streaks on basal portion of feathers;*^ 

 tail deep grayish brown (hair brown) with light greenish olive edgings; 

 wings dusky, the middle and greater coverts broadly (but not sharply) 

 tipped with pale yellowish olive (usually paler and more yellowish on 

 greater coverts), forming two distinct bands, the secondaries broadly 

 edged (except basally) with pale olive-yellow, the primaries and 

 greater coverts narrowly edged with pale olive; sides of head and 

 neck similar in color to pileum and hindneck but slightly paler, 

 slightly relieved by an indistinct supraloral streak and indistinct 

 narrow orbital ring of very pale olive or dull olive-whitish; chin, 

 tlu'oat, chest, sides, and flanks pale yellowish olive or grayish olive- 

 buff, passing into pale straw yellow on abdomen, under tail-coverts, 

 and median portion of breast; axillars and under wing-coverts 

 mostly pale straw yellowish; maxilla dark brown or horn brown, 

 mandible much paler, sometimes brownish at tip; iris brown; legs 

 and feet dark brown. 



a I am not able to verify other characters given in the original description as dis- 

 tinguishing the two forms, which, indeed, I have much difficulty in separating satis- 

 factorily. 



b Eight specimens. 



c Six specimens. 



rf Although Doctor Sclater (Cat. Birds Brit. Mus., xiv, pp. 136, 137, 145) places this 

 species in the section of the genus characterized by possession of a white "vertical 

 spot," I find, after careful examination of thirty-two adults that only eight of these 

 (exactly one in four) ha^'e even a trace of white on center of crown, and in none of 

 these eight does the white amount to more than a minute streak at the base of a few 

 feathers. 



