242 REVIEW OF AMERICAN BIRDS. [PART I. 



and 9th, are common to all. The relationship to Myiodiocies is quite 

 close, especially to canadensis and pusillus ; but the characters just 

 mentioned will distinguish them. The transition, however, to Idiotes 

 is very gradual, throOgh such species as /. mesochrysus. Setophaga 

 is distinguished by a much more depressed and thinner bill, with 

 the culmen and commissure nearly straight for most of the length, 

 as well as by other features. 



Synopsis of Species of Basileuterus. 



Top of head with two black stripes inclosing a median of 

 yellow or orange. No rufous on sides of head. 

 Beneath entirely yellow. 



Central stripe of head orange brown, mixed 

 with gray. Back olive green. 



Supra-ocular stripe and eyelids whitish vennivorus,^ Cab 

 Supra-ocular stripe and eyelids yellow 



(not seen) ..... bivittatus, Scl. 

 Central stripe of head yellow, sometimes mixed 

 with orange. Back olivaceous-ash. 



Supra-ocular stripe and eyelids yellow- 

 ish-green ..... culicivorus, Bp. 

 Chin and throat gray; rest of under parts yellow. 

 Back olive. Supra-ocular stripe ash color ? 



Central stripe of head brownish-orange . . coronatus,^ Scl. 

 Central stripe of head yellow ; thi-tat darker 



ash (not seen) ..... cinereicollis, Scl. 



Top of head with two black stripes inclosing a median of 

 ash, or nearly unicolor ashy or brown. No rufous on 

 sides of head. Beneath whitish, or not bright yellow. 

 Back olive green, uniform with rump. 



Top and sides of head ash, scarcely lighter in 



centre. Supra-ocular line and eyelids white. [Scl. 



Sides tinged with olive green . . . leucoblepharum,^ 



' A species — B. hypolertcus, Bp. — from Brazil, is said to diifer in being white 

 beneath. 



^ B. viridicata, Burm. Ill, 113 (D'Orb. Voyage, IX, 32.5) appears quite similar, 

 with the vertex stripe yellow, not orange. In this respect it agrees with cinerei- 

 collis (ScLATER, P. Z. S. 1864, 166, Bogota), and like it has a grayish-ashy 

 throat, tinged with greenish. The difference I am unable to state. Basileu- 

 terus chrysogaster, of Peru (Setophaga chrys. TsceuDi, F. P. 192), is said to be 

 yellow beneath, olive green above, a little darker on top of head where the 

 feathers are yellow at base, and orange'in middle. 



* Basdeuterus leucoUtpharum, Scl. Catal. p. 36. A Paraguayan, and conse- 

 quently a typical specimen, has the whole top of head uniform slaty gray, 



