BIRDS OP NOETH AND MIDDLE AMEBICA. 749 



BASILEUTERUS RUFIFRONS SALVINI (Cherrie). 

 SALVIN'S WAEBLER. 



Similar to B. r. fiavi<jitKtei\ but hindneck and sides of neck olive 

 (not distinctljr different from color of hack, 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. ruffrom grades insensibly into the 

 present bird through the intermediate scries named B. ffarlgnster ))y 

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

 of B. salvmi 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 puzzling element 

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

 tinguishable from B. r. fiavigaster and B. r. rufifroiix. Possibly these 

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



Basileuterus delattrii (not of Bonaparte) Salvin and Sclater, Ibis, 1860, 274 

 (Duenas, Guatemala). — Baird, Review Am. Birds, 1865, 249, excl. syn., 

 part (Coban, Guatemala). — Salvin and (todman, Biol. Centr.-Am., Aves, i, 

 1881, 176 (Duenas, Yolcan 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). 



IBasileuterus] delattrii Sclater and Salvin, Nom. Av. Neotr., 1873, 10. 



B[asUaaerus} delairii Bidgway, Man. N. Am. Birds, 1887, 532, part. 



[Setophaga] delattrii Gray, Hand-list, i, 1869, 245, no. 3555. 



BasileuUrus salvini Cherrie, Proc. U. S. Nat. Mus., xiv, no. 855, Sept. 4, 1891, 

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



BASILEUTERUS RUFIFRONS DELATTRII (Bonaparte). 

 DELATTEE'S WARBLEK. 



Similar to B. r. salvmi, but chestnut of the pileum and auricular 

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

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

 of neck grayish (darker than in B. r. rufifrona and B. r. fiavigaster) ; 

 olive-green of back, etc., darker. 



Young, first plumage. — Above, including pileum and sides of head, 

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

 dark brownish gray, 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 o£ Basileulerus salmni Cherrie. 



