TERETRISTIS. raf 
B. Wings rounded ; the Ist quill shorter than in the preceding 
section, always less than the 5th. 
1. Bill much depressed, and widened at base. Culmen 
and commissure quite straight to near the tip. 
a. Bill attenuated towards the end; lateral outlines 
straight or concave. Tail decidedly longer 
than the wings. Second quill as Jong as 6th. 
Rictal bristles reaching nearly to tip of bill, 
which from gape is rather less than the 
length of skull. Tail considerably grad- 
uated (.50), the feathers soft, broad ; 
the outer web of outer feather wide, 
nearly even, and about one-third the 
width of inner. <A rufous patch on 
vertex . - c : “ : - Myioborus. 
Rictal bristles reaching a little beyond mid- 
dle of bill, which is elongated, and from 
gape about equal to length of skull. 
Tail moderately rounded, the feathers 
firm; the outer web of outer feather 
not more than one-fourth the width of 
inner. A yellow stripe on vertex - Euthlypis. 
6. Bill broad towards the end; lateral outlines ob- 
tuse, like Todirostrum. Tail very little longer 
than the wings. Second quill much shorter 
than 6th. 
Rictal bristles extending just beyond nos- 
trils. Tail graduated, the feathers nar- 
row, pointed. Outer webs narrow  . Myiothlypis. 
2. Bill pointed, depressed, and more or less wide at base, 
but deep, and the culmen gently curved from the base. 
a. Tail nearly even, the feathers narrow, about equal 
to or very little longer than the lengthened 
wings (1st quill about equal to the 7th). Bill 
thickened, and broad at base. Rictal bristles 
lengthened. Tarsi short. Vertex with two 
black stripes inclosing a median one of a yel- 
low, orange, or ashy color . 2 : - Basileuterus. 
b. Tail decidedly longer than the abbreviated wings 
(ist quill not longer than 9th), much grad- 
uated, the feathers narrow. Bill rather nar- 
row, scantily bristled. Tarsi long. Top of the 
head chestnut ° A - 5 : . Idiotes. 
c. Tail about equal to the lengthened wings (Ist quill 
about equal to the 6th), nearly even, the 
feathers broad. Bill very small, and narrow; 
rictus well bristled; prevailing color red. . Ergaticus. 
