CATALOGUE OF BIRDS. 



GEXU3. TRUE SPARROWS. SPIZELLA. Rather slender birds with 

 slightly forked tails. Top of head, reddish ; unstreaked in adults of our species. 

 No streaks below in adults, and no prominent white markings on tail. Sexes, 

 similar. 



FIG, 5. 



VOCAL ORGANS oP EVENING GROSBEAK. A, transverse bone ; B, portion of windpipe ; C, side view 

 of syrinx and bronchial tube ;D. front view of same; E, X-shaped muscle; F, inner side of bronchial 

 tube; A B, broncialis muscles ; s, sterno-tracheals ; v, vibrating membrane. All enlarged. 



1700-2 Chipping Sparrow, adult. Dark line through eye ; bill, dark, 



1703-4 do do young, streaked on crown* 



1705-6 Field Sparrow. No line through eye ; bill, red. 



1707-12 Tree Sparrow. Bill, yellow at base beneath: spot on breast, 



FIG. 6. 



Bill of Rose-breasted Grosbeak ; A, side view ; I, section through base. 



Genus. Zone-throated Sparrows. Zonotrachia. Wings rather short ; tail 

 founded ; top of head conspicuously masked with black and white. 



1713-16 White-throated Sparrow. Yellow spot in front of eye; throat 

 abruptly white. 



1717 White-crowned Sparrow. Throat not abruptly white ; no yellow in 

 front of eye. 



