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»I(UH» VI HIRUNDO. 'iAVrUft 



209 



Hlruntlo thalasslna. 



Uirundo thala»»ina, tivrxinmv, Plill. Mag. 1, 1827, 3(J5 (Mexico). — Am. 

 r ■' Orn. Blog. IV, pi. 3Hr).— In. IJ. A. I, pi. 4«.— Uukwku, N. A. Ool. 

 -'" ° 1, 1857, 102 (the flg. pi. t, flg. 74 of egg belongH to another HpeoleH). 



— Baikd, Birds N. Am. 1858, 311.— Maxam. Cab. Jour. 1858, 101. 



— Lord, Pr. R. A. Innt. Woolw. IV. 18t)4, 115 (Vancouver M. ; nents 



■ *' In holes of trees).— Coopkr & SnrKLKV, F. R. R. R»'p. XII, ii, 185 



'' (W. T.).—Chelidon thalamina, Boib, IhIh, 1844, \1\.— Tarhiirineta 



thulasiitKt, Cab. Mus. Ilein. 1850, 48. — Petrnchelidon thalnmua, 



BcLATKR & Salvin, Ibls, 1H59, 13 (Guatemala). — Sclatku, Catal. 



1861, 39, no. 239.— Ib. V. Z. S. 1804, 173 (City Mex.) 



i7jft. Western and middle provinces of United States, south to Guatemala. 



SpofMiiens from dilTcrcnt locnlititis, as well as from tljc huiiic i)lace, 

 vary Honiewhat in the shade of coloration. Sonietimos, as in other 

 Swallows, the innermost secondariea aro edged and tipped with 

 wliite, more or less conspicuously. Young birds are uniform lustre- 

 less grayish-brown above, something like Cotyle ri[)aria, white 

 below, with perhaps a tinge of ashy across breast ; the upper sur- 

 face of wings and tail with a greenish gloss ; the whole side of 

 head, including loral region and around the eye, dusky, not white as 

 ill the adult. The white feathers on the posterior inner face of the 

 tarsus are more conspicuous than in the adult, and reach nearly two- 

 thirds the way to the toes, but do not exist at tiie lower end as in 

 CoUjle riparia, which at once distinguishes them. All the feathers 

 of under parts, even of chin and throat, are gray at base, not white; 

 those of breast plumbeous to near tips, with a central stripe of lighter 

 (concealed). 



Specimens (probably resident) from Cape St. Lucas are much 

 smaller than from Upper California, the wing measuring 3.95, the 

 tail l.flO inches, while 1,89.5 measures 4.50 and 2.20, respectively. 

 No. 29,204, from a typical locality (Orizaba), measures 4.70 and 

 2.40. 



Tiio fully fledged young bird differs so much in appearance from 

 the iidult, that I was at one time inclined to consider them as differ- 

 ent species. The female is duller than the male, especially on the 

 head and rump. ; 



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