300 AVES : PASSERES, — XLVI. : 
tions. The adult males of the different species are readily dis- 
tinguished, but 9 and young offer difficulties. The tail feathers 
are always marked with white or yellow, and the bill is usually 
little pointed, notched, and with evident bristles at the rictus. 
The following artificial analysis, partly taken from Coues’s 
“Key,” will generally enable the student to distinguish speci- 
mens, at least the males in full plumage : — 
a. Tail feathers edged with yellow; plumage chiefly yellow. . cstwa, 969. 
aa. Tail feathers blotched with white. 
6, A white blotch on the primaries near their bases; no wing bars. 
cerulescens, 970. 
66. No white blotch on primaries. 
c. Wing bars, if present, not white. 
d, White below; crown and wing patch more or less yellow. 
pennsylvanica, 974. 
dd. Yellow below; sides reddish-streaked; crown chestnut. 
palmarum, 983. 
ddd. Yellow below; sides black-streaked. 
e. Back olive with reddish spots. . . . . . . « discolor, 982. 
ee. Backashy. . . . » «© 2 + « «© « » ©  kirtlandi, 981. 
ec. Wing bars or wing patch white. 
J. Rump yellow. 
g- Crown clear ash; yellow and streaked below. maculosa, 972. 
g9- Crown with yellow spot; white and streaked below. 
coronata, 971. 
ggg. Crown black with a median stripe of orange brown; an 
orange brown ear-spot. . . . . . « tigrina, 968. 
Jf. Rump not yellow. 
h. Crown with orange or yellow spot; throat orange or yellow. 
blackburnie, 978. 
hh. Crown black; no distinct yellow anywhere; much streaked. 
striata, 976. 
hhh. Crown blue or greenish, like the back; no definite yellow. 
rara, 973. 
Ahhh. Crown chestnut, like the anita no definite yellow; 
buffy below. . . . . + + « Castanea, 975. 
hhhhh. Crown bluish or yellowish, nee as above, — some yel- 
low. 
i. Throat black (sometimes obscured by yellow tips to 
feathers); outer tail feather white-edged. virens, 979. 
ti. Throat yellow. 
Jj» Back ashy blue; cheeks black. . . . dominica, 977. 
jj» Back yellowish olive; cheeks same. . . vigorsi, 980. 
We copy from Coues’s Key the following valuable diagnostic marks 
of Warblers in any plumage : — 
A white spot at base of primaries... . s+ + © © cerulescens, 970. 
Wings and tail dusky, edged with spalliwt4 se ee ww es @stiva, 969. 
Wing bars and belly yellow. . . . . - - » . .» . . discolor, 982. 
