FAMILY FORMICARIIDAE I23 



19. Elongated flank feathers white. 



Black ant-wren, M yrmotheriila axillaris alhignla, adult male, p. 171 

 Elongated flank feathers slate-gray. 



Slaty ant-wren, MyniwtJicriila schisticolor schisticolor, adult male, p. 175 



20. Wing coverts plain, without spots. 



Slaty ant-wren, Mynnothcrida schisticolor schisticolor, 



female and immature male, p. 175 

 Wing coverts spotted with cinnamon-buff 21 



21. Under surface paler, huffy white to buff. 



Black ant-wren, Mynnothcrida axillaris albigula, female, p. 172 

 Under surface darker, dull cinnamon to cinnamon-buff. 



Fulvous ant-wren, Myniiothcrula jidvivcntris, p. 167 



22. Foreneck and breast clear white. 



Bicolored ant-bird, Gymnopithys bicolor, p. 224 

 Foreneck and breast if white spotted or streaked with another color. ... 23 



23. Back and breast heavily marked with rounded black spots. 



Ocellated ant-bird, Phacnostictus nicclcannani, p. 234 

 Back not heavily spotted with black 24 



24. Wing coverts widely banded with cinnamon-brown 25 



Wing coverts lined or bordered with buff or white, or plain 26 



25. Small ; tail more than one-half length of wing ; under surface white or 



pale buff, breast spotted .. Spotted ant-bird, Hylophylax nacvioidcs, p. 229 

 Larger ; tail short, decidedly less than one-half length of wing ; breast, sides, 

 and abdomen plain gray, without markings. 



Wing-banded ant-bird, Myrinoniis torqiiata stictoptcra. p. 211 



26. A cinnamon-brown area, concealed by overlying feathers, in center of back 



Russet ant-shrike, Thamnistes anabatinus, p. 151 

 Back with concealed patch white, or without such marking 27 



27. With prominent white tips on tail feathers. 



Jet ant-bird, Ccrcomacra nigricans, p. 190 

 Tail not prominently tipped with white 28 



28. Breast and foreneck with narrow shaft lines of black or slate ; crown 



heavily spotted ; small. 



Spotted-crowned ant-vireo, Dysithamntis puncticeps puncticeps, p. 158 



Breast and foreneck not lined narrowly with black or slate, crown not 



spotted 29 



29. Abdomen light yellow; small. .Plain ant-vireo, Dysithamntis incntalis, p. 154 

 Abdomen not light yellow ; larger 30 



30. Abdomen white ; back and upper tail coverts rufous-brown. 



White-bellied ant-bird, Myrmccica longipcs pananicnsis, p. 197 

 Abdomen black, slate, or rufous 31 



31. Wing coverts rather finely spotted with white ; throat black in male, spotted 



with white in female. 



Salvia's ant-bird, Myrnicciza lacnwsticta lacmosticta, p. 206 

 Wing coverts edged with white, or cinnamon, or without markings 32 



32. With an area of white concealed in the back ii 



With no concealed white in the back 34 



