CHERRIE: ORNITHOLOGY OF THE ORINOCO REGION. 



273 



m. Larger, wing more than 75 mm.; top of 

 head slate gray in sharp contrast with color 

 of back 



m'. Smaller, wing less than 75 mm. and top of 



head uniform with back 



. "Nostrils more or less narrow and longitudinal, more or less dis- 

 tinctly operculate, or if broadly oval or roundish the remainder of 

 nasal fossae occupied by membranous integument." 1 (Myrmother- 

 ula, Myrmopagis, Microrhopias, Herpsilochmus, Ramphocaerus, 

 Cercomacra, Thamnomanes Myrmoborus, Hypocnemis, Hapalocer- 

 cus, Myrmeciza, Myrmoderas, Formicarius). 

 d. Bill long and slender, as long as head 



d'. Bill not unusually long and slender, not as long as head. 



e. Outstretched feet reaching little if any beyond the tips of the 



under tail coverts 



e'. Outstretched feet reaching much beyond the end of the under 



tail coverts. 

 /. A restricted, sharply denned, buff colored area at the base 



of the inner webs of the wing-quills, 

 g. Entire top of head, forehead, crown and occiput rufous 



(the crown feathers tipped only with rufous) 



g'. Wide frontal band black, crown and occiput rufous 



/'. No restricted, sharply defined buff colored area at base of 



inner webs of wing-quills. 



g. Distance from tips of under tail-coverts to tip of tail not 

 greater (usually less) than length of bill, and lower back 

 not marked with rounded white or buff y spots. 

 h. Sides of face, lores and auriculars black. 



'. With broad frontal and superciliary stripe, white in 

 males, rufous in females (no concealed white dorsal 

 spot) 



'. No frontal band and superciliaries narrow (a con- 

 cealed white dorsal spot) 



h'. Sides of face not black. 



i. Tertials and secondaries with cinnamon buff tips .... 

 '. No cinnamon buff tips to tertials or inner secondaries. 

 j. General color of under parts gray and throat prac- 

 tically uniform with breast. 

 k. Slate gray below 



k'. Light neutral gray below 



j'. General color of under parts (gray) in sharp con- 

 trast with black or white throat; or with head and 

 back conspicuously striated. 

 k. Breast gray. 



I. A white shoulder patch. 



m. Tail-feathers narrowly tipped with white. . 



m'. Tail not white tipped 



I'. No white shoulder patch 



k'. Breast not gray; and head and back striated. 

 /. General color of under parts yellow (pale or 

 lemon) ; and bill much more than one-half as 



long as tail 



/'. General color of under parts white or buffy, 

 and bill little if any more than one-half the 

 length of the tail. 



m. Both maxilla and mandible black (females 

 as well as males striated with black on 



underparts) 



m'. Mandible pale, maxilla black, females not 

 strongly striated with black below 



g'. Distance from tips of under tail-coverts to tip of tail 

 greater than length of bill; or lower back marked with 

 rounded white or buffy spots. 

 h. Back more or less striated. 



. Gray or grayish white below 



'. Throat and breast yellow or pale yellow. 

 j. Smaller, breast not (or less) distinctly squamate . . . 

 /. Larger, breast more distinctly squamate 



9 Sclateria schislacea cauren- 

 sis. 



9 Sclateria argentata. 



Ramphocaenus melanurus Irin- 

 itatis. 



Thamnomanes glaucus. 



Formicarius ruficeps. 

 Formicarius colma colma. 



Myrmoborus leucophrys leuco- 

 phrys. 



Myrmoborus myotherina my- 

 otherina. 



Myrmotherula guttata. 



tf Myrmotherula cinereiven- 



tris cinereiventris. 

 & Myrmotherula cinereiventris 

 pallida. 



tf Myrmotherula longipennis. 

 o" Myrmopagis schisticolor . 

 Myrmoborus melanopogon. 



Myrmotherula pygmaea. 



Myrmotherula cherriei. 



Myrmotherula surinamensis 

 surinamensis. 



Herpsilochmus sticturus Stic- 

 turus. 



Hypocnemis flavtscens humilis. 

 Hypocnemis flavescens ftatt- 

 scens. 



'Ridgwayl. c. p. 12. 



