ANALYSIS OF THE SPECIES OP VIEEO 491 



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

 they having been originally prepared with reference to his 

 " Eeview ". 



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. Flavifkons. 



2. Throat and breast white. 



a. Crown ashy, black-edged. 



aa. Back olive ; sides of chin streaked ., V. barb atultjs. 



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



b. Crown ashy, not black-edged, quite like the back, V. philadblphicos. 



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



rious". 



3. Crown black V. atkicapillus. 



4. Crown not black. 



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



V. TICINIOR. 



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



CO. Wiug-bands wanting : coloration as in ^ftiMeJpfticus. ..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. plumbeds. 



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



g'. Wing equal to tail, 2i inches ; Ist primary i 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. 



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

 lowish V. HUnONL 



The following North American species are not known to 

 occur in the Colorado Basin : — 



Tlreo calldrls barbatalns.— IHonstactacd Greenlet. 



Vlreo gUvus, D'Orb. La Sagra's Cuba, 1839, 43. (Not of Authors.) 



Vireo longlrostrls, t NuU. Mrh.!. 33 ed. 1840, 359. 



Vlreo altiloauus, Gamb. Pr. Phila. Acad. 1848, 127 (Florida).— Bd. BNA. 1858, 334, excl. 



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

 VlreosylTla altlloqaa, Oass. Pr. Phila. Acad. 1851, 158 (Florida) Cass, niust. 1853-4, 



231, pi. 37 (partly ; inolndea trae oMiloquus, " Florida "). — Sry. Pr. Boat. Soo. Tii 1859, 



113 (Babamaa). —Albrecht, J. f. 0. 1861, 206 (Caba). 

 Vlreosylva altiloqua, Bd. Kep. Great Salt Lake, 1852, 328 (Florida). 

 Vlreo Tirescens, Poei/? (C!aba. Either this or oiwoceMs. Not ofVieill.) 

 Vlreo olivaceus, ZTticjiemann, J. f. 0. 1857, 147 (Cuba; egg). 



