322 Birds of Colorado 



b* Inner secondaries slightly elongated ; tail-feathers 

 narrow and pointed. Spiza, p. 405. 



c* 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- 



b^ Iimer 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 roimded at tips. 



a^ Outer (ninth) primary longer than third ; edge of wing 



yellow. Peucaea, 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. 



c. 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. 



c^ Tail without white ; plumage streaky above. 



a^ Outer toe small, not reaching the middle of tlie sub- 

 terminal phalanx of the middle toe. 

 a* Tarsus at least } 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. 



