HIRUNDO. 29 1 



perhaps only elsewhere in Callichelidun cyaneoviridis. The baKul 

 joint of middle toe is entirely adherent externally, and for more than 

 half internally, and in this respect agrees with leucoptera and albi- 

 linea, while in bicolor and leucorrhoa it is adherent for only three- 

 fourths externally, and about half internally. 



The feet of H. leucorrhoa appear proportionally more robust than 

 in other species, differing in this respect from its miniature, albilinea, 

 which agrees better with the rest. 



The following is a synopsis of the American species ; all of which, 

 as stated, 'are green above, with or without white rump ; white 

 beneath : — 



a. Tachycineta, 

 Plumage soft and velvety, without metallic gloss. Sides of head, 

 space around eyes, and whole under parts white ; with the 

 feathers all plumbeous at base. Female duller in plumage. 

 Above green, with various shades and tinges of violet and 



purple ......... thalassina. 



Plumage above compact, and with rich (usually gieen) metallic 

 gloss. Sides of head to line with eyes like its upper part. 

 Beneath white, sometimes with ashy tinge across breast ; the 

 feathers of chin and throat, and generally of crissum, white 

 to base. A concealed spot in jugulum. 

 Entire upper parts uniform in color. 



Inside of wings and axillars ash color. No concealed 



basal white on the upper parts . . . bicolor. 



Rump white. No white loral line. 



Back green. Pure white beneath. Feathers of back 



and forehead with much concealed white at base. 



Edges of secondaries and greater coverts white albiventris. 



"Back bluish or purple. A grayish band across 



breast. No white on wing. Feathers of back 



? at base" meyeni. 



Rump white. A distinct whitfe loral line. 



Ruuip plain white. Bases of dorsal feathers ashy. 

 No shaft streaks beneath. Length, 5.50 ; wing, 



4.50; tail, 4.40 leucorrhoa. 



Rump and tinder parts with more or less distinct 

 dusky shaft streaks. Breast and sides with an 

 ashy tinge. Length, 4.50 ; wing, 3.75 ; tail, 2.00 albilinea. 



Ilirundo bicolor. 



Hirundo bicolor, Vieill. Ois. Am. Sept. I, 1807, 61, pi. xxxi. — Ann. 

 Orn. Biog. I, pi. 98. — Ib. B. A. I, pi. 46.— Cassin. — Beewek, N. Am. 



