BIRDS OF NOIITH AND MIDDLE AMERICA. 749 



BASILEUTERUS RUFIFRONS SALVINI (Cherrie). 

 SALVINS WARBLER. 



Similar to B. r. ^fiavu/a.ster, but hiudneck and sides of neck olive 

 (not distinctly different from color of back, etc.), instead of gray; 

 back, etc., rather browner olive-green; under parts entirely yellow; 

 length (skin)^ 127; wing, 53; tail, 59; exposed culmen, 11; tarsus, 21. 



Highlands of Guatemala (Coban, Vera Paz). 



Having but a single specimen of this form I am not able to form 

 a very decided opinion as to its status. Only these two facts are 

 clearly evident: (1) that typical B. rujifrons grades insensibly into the 

 present ])ird through the intermediate series named B. jlaiiigaster by 

 Mr. Nelson, whose type is distinguishable from Mr. Cherrie's type 

 of B. salvliil only by the distinctly gray neck and slightly clearer 

 olive-green color of the back, etc., other apparent differences rep- 

 resenting characters which vary with season or with the individual; 

 and (2) that the varying amount of yellow on the under parts is wholly 

 independent of relative age of the specimens. The })uzzling element 

 in the case is that in Guatemala occur specimens which are indis- 

 tinguishal)le from B. r. flavlg aster and B. r. rujifrons. Possibly these 

 are migrants, all the resident birds representing B. r. mhiinl. 



Basileufcrnx delaftrii (not of Bonaparte) Salvin and Sclatkr, Dm, ISliO, 274 

 (Dueiias, Guatemala). — Baird, Review Am. Birds, 18(35, li49, excl. syn., 

 part (Coban, Guatemala). — Salvin and Godman, Biol. Centr.-Aiti., Aves, i, 

 1881, 176 (Duefias, Volcan de Fuego, Volcan de Agua, Coban, Lanquin, and 

 Cahabon, Guatemala; not "Nicaragua"). — Sharpe, Cat. Birds Brit. Mus., x, 

 1885, 396 (Diego, Calderas, La Trinidad, etc., Guatemala). 



IBmileutertis] delattri i i^vLATER a.nd Salvin, Nom. Av. Neotr., 1873, 10. 



Blasileuteriis'] delalril Ribgway, Man. N. Am. Birds, 1887, 532, part. 



ISetophaga'] delaftrii Gray, Hand-list, i, 1869, 245, no. 3555. 



Basileuferus salvini Cherrie, Proc. IT. S. Nat. Mus., xiv, no. 855, Sept. 4, 1891, 

 342 (Coban, Guatemala; coll. U. S. Nat. Mus.). 



BASILEUTERUS RUFIFRONS DELATTRII (Bonaparte). 

 DELATTRES WARBLER. 



Similar to B. r. mlvlni., but chestnut of the pileuni and auricular 

 region darker, the latter involving the whole of the auricuhir region 

 instead of the upper and posterior portions only; hindneck and sides 

 of neck grayish (darker than in B. r. rujjfrons and B. r. favl.g(:ister)\ 

 olive-green of back, etc., darker. 



Young ^ firnt pluiiuuje. — Above, including pileum and sides of head, 

 plain brownish olive; greater wing-coverts, remiges, and rectrices 

 dark brownish gra}^, edged with olive-green, as in adults; middle and 

 greater wing-coverts tipped with cinnamon-buff', forming two distinct 



' Specimen without sex determined; no. 30700, coll. U. S. Nat. Mus., Coban, Vera 

 Paz, Guatemala, Nov. 15, 1859; O. Salvin. Type of BasUeutenis mlvini Cherrie. 



