462 NORTH AMERICAN BIRDS. 



southern Mexico, from Isthmus of Panama to Mazatlan and British 



Honduras. 



T. albilinea Lawk. White-rumped Swallow. 1 



a 2 . Ear-coverts partly or mainly white ; feathers of lower parts abruptly grayish 

 beneath the surface; upper parts in adult soft, metallic (but not burnished), 

 green or greenish bronze, varied with tints of purplish, purplish bronze, 

 violet, etc. (Subgenus Tachycineta.) 



Adult male: Top of head, hind-neck, back, and scapulars rich green, either 

 the head and neck or dorsal region, or both, usually overlaid by a more 

 or less distinct wash of, bronze or purple; rump and upper tail-coverts 

 rich bluish green or bluish, usually mixed with rich plum-purple ; a 

 white patch on each side of rump, these in life often brought close to- 

 gether so as apparently to form a continuous white band ; entire lower 

 parts, including ear-coverts and line above posterior half (or more) of 

 eye, pure white, but the feathers immediately beneath surface grayish. 

 Adult female: Similar to the male, but much duller, the ear-coverts and 

 hind-neck dull grayish, the former, however, more or less mixed with 

 white. Young : Similar to same stage of T. bicolor, but with feathers 

 of lower parts distinctly grayish beneath the surface, this showing 

 through on anterior portions, especially on breast. Length 4.75-5.50, 

 wing about 4.30-4.75, tail 1.95-2.20. Eggs .73 X .51. Sab. Western 

 United States, east to Eocky Mountains, south, in winter, to Guate- 

 mala 615. T. thalassina (Swains.). Violet-green Swallow. 



Gentjs CALLICHELIDON Bryant. 2 (Page 458.) 



Species. 



Adult male : Above soft dull metallic green (not burnished), changing to more 

 bluish green on wings, rump, upper tail-coverts, and tail; entire lower parts, in- 

 cluding sides of head below level of eyes, pure white. Adult female : Similar to male, 

 but suborbital region and ear-coverts mottled grayish. Length about 5.50-5.70, 

 wing 4.30-4.50, tail 2.60-2.85, forked for .85-.95. Sab. Bahamas. 



C. cyaneoviridis Bryant. Bahaman Swallow. 8 



Genus CLIVICOLA Forster. (Page 458, pi. CXIV., fig. 4.) 



Species. 



Adult : Above dull grayish brown or brownish gray, dai'ker on head and wings, 

 paler on rump and upper tail-coverts ; beneath white, interrupted by a broad band 

 of brownish gray across chest, this continued along sides ; usually, a more or less 



1 Petrochelidon albilinea LAWR., Ann. Lye. N. Y. viii. 1863, 2. Tachycineta albilinea Lawr., Mem. Bost. 

 Soo. ii. 1874, 271. 



2 Callichelidon " Bryant, MSS." Baird, Review Am. B. i. May, 1865, 303. Type, Hirundo cyaneoviridie 

 Bryant. 



8 Hirundo cyaneoviridis Bryant, Pr. Bost. Soo. N. H. vii. 1859, 111. 



