ANALYSIS OF THE SPECIES OP VIREO 491 



use, as I did in the " Key ", through Professor Baird's kindness, 

 they having been originally prepared with reference to his 

 " Keview ". 



The North American species of Vireo may ordinarily be dis- 

 tinguished by the following 



Analysis of Species 



A. Primaries apparently only 9, the 1st being rudimentary and usually con- 



cealed or displaced (occasionally quite visible). 



1. Throat and breast rich yellow V. FLAVIFRONS. 



2. Throat and breast white. 



a. Crown ashy, black-edged. 



aa. Back olive; sides of chin streaked V. BARBATULUS. 



6Z>. Back olive ; no streaks on chin ....V. OLIVACEUS. 



6. Crown ashy, not black-edged, quite like the back, V. PHILADELPHICUS. 



B. Primaries evidently 10, the 1st being obvious, though short and " spu- 



rious". 



3. Crown black V. ATRICAPILLUS. 



4. Crown not black. 



c. 1st primary at least as long as 2d, and wing 2-J inches long. 



V. VICINIOR. 



d. 1st primary not as long as 2d ; or, wing not 2 inches long. 



cc. Wiug-bands wanting : coloration as in philadelphicus . ..V. GILVUS. 

 dd. Wing-bands present : length over 5 inches. 



e'. Back olive, contrasting with ashy-blue crown V. SOLITARIUS. 



/'. Back plumbeous, crown scarcely different V. PLUMBEUS. 



ee. Wiug-bands present : length 5 inches or less. 

 g'. Wing equal to tail, 2 inches ; 1st primary as long as 2d. 



V. PUSILLUS. 

 h'. Wing longer than tail ; crown ashy ; chin and superciliary line 



white V. BELLI. 



i'. Wing longer than tail; crown olive; chin white; superciliary 



line yellow V. NOVEBORACENSIS. 



&'. Wing longer than tail; crown olive ; chin and under parts yel- 

 lowish V. HUTTONI. 



The following North American species are not known to 

 occur in the Colorado Basin : 



Vireo calidris barbatnlns. Monstachcd Greenlet. 



Vireo gilvus, D'Or&. La Sagra's Cuba, 1839, 43. (Not of Authors.) 



Vireo longirostris, ? Nutt. Man. i. 2d ed. 1840, 359. 



Vireo Ultiloquus, Qamb. Pr. Phila. Acad. 1848, 127 (Florida). Bd. BNA. 1858, 334, excl. 



syn. (Florida). (Not Muscicapa altiloqua of Vieillot.) 

 Vireosylvia altiloqua, Cass. Pr. Phila. Acad. 1851, 152 (Florida). Gass. Uluat. 1853-4, 



231, pi. 37 (partly; includes true oMiloquus, "Florida"). Bry. Pr. Boat. Soc. vii. 1859, 



113 (Bahamas). Albrecht, J. f. 0. 1861, 206 (Cuba). 

 Vireosylva altiloqua, Bd. Eep. Great Salt Lake, 1852, 328 (Florida). 

 Vireo Yirescens, Poey? (Cuba. Either this or olivaceus. Not of Vieill.) 

 Vireo olivaceus, Thicnemann, J. f. 0. 1857, 147 (Cuba ; egg). 



