7 
HIRUNDO. 297 
perhaps only elsewhere in Callichelidon cyaneoviridis. The basal 
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. Tachycincta. 
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, 
b. 
Rlumage above compact, and with rich (usually green) 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” . c “ : : + meyent. 
Rump white. A distinct white loral line. 
Rump plain white. Bases of dorsal feathers ashy. 
No shaft streaks beneath. Length, 5.50; wing, 
4.50; tail, 4.40 ; - 5 : ; . leucorrhoa. 
Rump and under 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. 
Hirundo bicolor. 
Mirundo bicolor, Vir. Ois. Am. Sept. I, 1807, 61, pl. xxxi.—Avp. 
Orn. Biog. I, pl. 98.—Is. B, A. I, pl. 46.—Cassin.—Brewer, N. Am. 
