322 Birds of Colorado 
b* Inner secondaries slightly elongated; tail-feathers 
marrow and pointed. Spiza, p. 405. 
ce? Wing rounded, difference between primaries and secon- 
daries clearly less than the tarsus. 
a® Inner secondaries elongated. 
a‘ Outer primary much shorter than the fifth ; plumage 
streaky. Centronyx, p. 358. 
b* Ninth to sixth primaries about equal and abruptly 
longer than the fifth; plumage black in male, 
streaky in female. Calamospiza, p. 406. 
b3 Inner secondaries not elongated. 
a‘ Four outer primaries about equal; upper mandible 
deeper than the lower; plumage streaky, outer 
tail-feathers chiefly white. Pocecetes, p. 354. 
b* Ninth primary longer than the sixth, seventh and 
eighth the longest; plumage bright coloured in 
male, not streaky ; no white on tail. 
Passerina (in part), p. 403. 
B. Tail about equal to wing. 
a. Tail graduated. 
a? Tail-feathers narrow and pointed. Passerherbulus, p. 360. 
b? Tail-feathers rounded at tips. 
a? Outer (ninth) primary longer than third ; edge of wing 
yellow. Peuceza, p. 384. 
b? Outer (ninth) primary shorter than third; edge of 
wing not yellow. Aimophila, p. 385. 
b. Tail distinctly forked, central feathers always shorter than the 
lateral. Spizella, p. 368. 
ce. Tail nearly even, difference between inner and outer feathers 
always less than culmen. 
a* Outer tail-feathers wholly or chiefly white; plumage 
unstreaked in adult. Junco, p. 373. 
b* Tail black with a white edging, and sometimes a terminal 
spot on the outer web of the outer pair of tail-feathers 
only. Amphispiza, p. 381. 
ce? Tail without white ; plumage streaky above. 
a? Outer toe small, not reaching the middle of the sub- 
terminal phalanx of the middle toe. 
at Tarsus at least 3 of wing and breast distinctly 
streaked. Melospiza, p. 386. 
b‘ Tarsus less than } of wing, breast never streaked. 
Zonotrichia, p. 363. 
b? Outer toe large, reaching to middle of subterminal 
phalanx of the middle toe; plumage streaky above 
_nd below. Passerella, p. 390. 
