VIRUOSYLVIA. 



331 



beyond the closed wings and encroaching on the front part of the 

 breast, is never seen in olivacea, where any olive is concealed. The 

 crissum and axillars are much brighter yellow ; the inner edges of 

 the quills yellowish, not white. The tail feathers are decidedly 

 olivaceous in their concealed portion, not clear brown ; and the 

 olivaceous of the back is much brighter and more yellow. 



(3,976.) Eyes yellow. (38,929.) Eye red. (38,928.) Eye chocolate. 



Tireosylvla cliiTi. 



Sylvia chivi, Vieill. Nouv. Diet. XI, 1817, 174 (based on Azara, Con- 

 tram3ei5tre Gaviero, Aiiuntam. II, 34, no. 152). — Ib. Encyclop. 

 Meth. 1823, 437. 



Hab. La Plata region ; north to BaMa. 



(No. 16,340, 9.) General distribution of color the same as in V. olivacea. 

 The concealed portion of tail feathers more olivaceous than brown. The 

 inner edges of the quills pale olivaceous- 

 yellow, of the rectrices brighter yellow. 

 Sides of the body greenish-yellow. Axil- 

 lars and crissum sulphur yellow. Super- 

 ciliary dusky stripe deep and distinct. 

 Bill plumbeous, dusky above, pale at the 

 base below. 



Third quill longest ; 2d and 4th very 

 little shorter ; 1st shorter than the 5th, 

 nearly intermediate between it and the 

 6th. 



(No. 16,340.) Total length, 4.95 ; wing, 2.45 ; tail, 2.10; width of lateral 

 feather, .25 ; difference of 1st and 2d quills, .14, of 1st and 3d, .21, of 2d and 

 5th, .09, of 3d (longest) and 9th, .54; length of bill from forehead, .59, from 

 nostril, .35, along gape, .67 ; tarsus, .65 ; middle toe and claw, .50, claw alone, 

 .14; hind toe and claw, .43, claw alone, .15. 



A male bird. No. 30,973, from the Vermejo, is of precisely the same size. 

 22 May, 1866. 



Vireosylvia chivi. (Vermeijo Riv.) 



