NORTH AMERICAN BIRDS. 
I 90 
I Cypselinse. Tarsi feathered ; phalanges of the middle and outer toes three 
each’ (instead of four and five). Hind toe directed either forward or to one 
side, not backward. (Page 90.) 
Tarsi feathered ; toes bare ; hind toe directed forward . . . Cypselus. 
Both tarsi and toes feathered ; hind toe lateral (Page 90.) . Panyptila. 
Cheeturinae. Tarsi bare; phalanges of toes normal (four middle, five 
outer). Hind toe directed backwards, though sometimes versatile. 
Tarsi longer than middle toe. Tail-feathers spinous. Shafts of tail- 
feathers projecting beyond the plumage. (Page 90.) . . . Chcetura. 
Similar to last, but shafts of tail-feathers not projecting. . . Nephoecetes. 
Subfamily CYPSELXNiE. (Page 90.) 
Genus PANYPTILA, Cabanis. (Page 90.) 
P. melanoleuca. Lustreless dull black ; no supraloral white spot, but instead a hoary 
wash ; white of throat extending back along middle of abdomen to the vent. Tail 
moderately forked, the lateral feathers obtuse. Length, 5.50; wing, 5.75; middle tail- 
feather, 2.30, outer, 2.85. Hob. Middle Province of United States, south to Guatemala. 
( White-throated Swift.') 
Subfamily CHiETXJRINiE. (Page 90.) 
A. Tail forked ; spinous points of the feathers not extending far beyond the 
webs or entirely wanting. Feathering of the sides of the forehead extending 
forward outside the nostrils nearly to their anterior end. Wing more than 6.00. 
a. No trace of spinous points to tail-feathers. Feathering of frontal points 
almost completely enclosing the nostrils between them. No light collar 
round the neck ; sides of the forehead with a hoary suffusion. (Page 90.) Neplicecetes. 
B. Tail rounded ; spinous points of the feathers much elongated. Feathering 
of sides of forehead scarcely reaching beyond posterior end of nostril. Wing 
less than 5.50. (Page 90.) Chcetura. 
Genus NEPHCECBTES, Baird. (Page 90.) 
N. niger. General color dark sooty-brown, with a greenish gloss, anteriorly. The 
on top of the head edged with, light gray, which forms a continuous wash on 
e of the forehead above, and anterior to the usual black crescent in front of the 
ill and 'feet black. Length, 6.75 ; wing, 6.75; tail, 3.00; the depth of its fork 
5 in the male, and scarcely .1 5 in the female. Hob. Washington Territory, Oregon, 
and Orizaba (var. borealis ) ; Cuba and Jamaica (var. niger). ( Black Swift.) 
Genus CENTURA, Stephens. (Page 90.) 
pelagica. Nearly uniformly dusky grayisli-brown, the throat, however, 
y much lighter, and the rump just appreciably so. 
Above glossy dusky-brown, hardly appreciably paler on the rump ; ■* 
abdomen scarcely paler than the back. Length, 5.25; wing, 5.20. 
Nest at the present time usually built against the inside of a chimney. 
Hab. Eastern Province North America. {Chimney Swallow.) var .pelagica. 
