ANALYSIS OF THE SPECIES OF VIREO 491 



use, as I (lid in the " Key ", through Professor Biiird's kiuduess, 

 tliey haviug been originally iirepared 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 Ist 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. 



ib. Back olive; no streaks on chin V. olivaceus. 



b. 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. atricapellus. 



4. Crown not black. 



c. Ist primary at least i as long as 2d, and wing 2i inches long. 



V. VICLNIOR. 



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



cc. Wiug-bauds wanting: coloration as in x^liiladelpliicus . . .Y . GILVUS. 

 dA. 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. Wing-bands present : length 5 inches or less. 



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



V. PUSILLUS. 



A', 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. 



fc'. Wing longer than tail; crown olive; cbin and under parts yel- 

 lowish V. nUTTONL 



The following North American species are not known to 

 occur in the Colorado Basin : — 



Tirco calidris barbatalas.— Monstaclictl Grcenlet. 



Vlreo gilvus, D'Orh. La Sagra's Cuba, 1839, 43. (Not of Authora.) 



Vireo longlrostrls, 1 Nutt. Man. i. 2d ed. 1840, 359. 



Vireo Ultlloquns, Gamh.'Pv. Phil.i. Acad. 1848, 127 (Florida).— Ud. BNA. 1858, 334, fixcl. 



syn. (Florida). (Not Mtiscicapa altiloqua of Vicillot.) 

 Vlreosjivla nltiloqua, Cass. Pr. Phila. Acad. 1851, 152 (Florida).— (7a«s. Eliist. 1853-4, 



iiiil, pi. 37 (partly; mc\xidea trao alliloquus, "Florida").— .Bn/. Pr. Boat. Soo.vii. 1859, 



113 (Bahamas).— AZ&rcc/i«, J. f. 0. 1861, 206 (Cuba). 

 VIreosylva aUiloqaa, Bd. Rop. Great Salt Lake, 1852, 328 (Florida). 

 Vlrco Tlrescens, Poe.v? (Cuba. Either this or oiiwaccws. Not of Vieill.) 

 Vireo olivaceus, rAicnCTnaJin, J. f. 0.1857, 147 (Cuba; egg). 



