124 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



33. Wing more than 75 mm ; wing coverts edged with white in male, with 



chestnut in female (concealed white absent in some) ; forecrown bare 

 in male, bright blue in life. 



Bare-crowned ant-bird Gymnocichla nudiceps, p. 192 

 Wing less than 70 mm ; head feathering normal. 



Tyrannine ant-bird, Cercomacra tyrannina, p. 186 



34. Form normal, body slender, legs proportionately shorter, tail normal ... 35 

 Form more rounded, body heavy, legs relatively longer, tail short 36 



35. Larger, wing 75 mm or more ; male black, female dull brown with side of 



head black Immaculate ant-bird, Myrincciza immaculata, p. 209 



Smaller, wing 70 mm or less ; male with black or blackish slate head and 

 under surface, and brown back ; female with slate-colored head and brown 

 lower surface Chestnut-backed ant-bird, Myrmcciaa cxsid, p. 200 



36. Small, wing less than 65 mm, tail less than 25 mm, with prominent rictal 



bristles Ochraceous pygmy ant-pitta, GraUaricula flavirostris, p. 241 



Larger, wing more than 75 mm, without prominent rictal bristles .... 37 



37. Breast plain, without streaks or spots 40 



Breast streaked, or heavily spotted 38 



38. Breast heavily spotted ; larger, wing more than 90 mm, bill heavy. 



Black-crowned ant-pitta, Pittasonia michleri, p. 237 

 Breast streaked ; smaller, wing less than 85 mm, bill slender 39 



39. Breast narrowly streaked ; wing coverts plain. 



Fulvous-bellied ant-pitta, Hylopczus ftdviventris, p. 248 



Breast heavily and broadly streaked ; wing coverts strongly spotted with 



buff Spectacled ant-pitta, Hylopezus pcrspicillatus, p. 250 



40. Dorsal surface with feathers edged with dusky. 



Scaled ant-pitta, Grallaria giiatimalcnsis, p. 243 

 Dorsal surface plain, without streaks or markings 41 



41. Breast chestnut or rufous. 



Rufous-breasted ant-thrush, Fonnicarin.i rufipectus, p. 222 

 Breast grayish brown to nearly black 42 



42. Crown and side of neck black. 



Black-headed ant-thrush, Formicarius nicjricapillus nigricapillus, p. 220 

 Crown brown, like back, side of neck rufous. 



Black-faced ant -thrush, Formicarius analis, p. 213 



CYMBILAIMUS LINEATUS FASCIATUS (Ridgway) : Fasciated 

 Ant-shrike, Hormiguerote Rayado 



Figure 11 



Cymbilanius lineatiis fasciatus Ridgway, Proc. U.S. Nat. Mus., vol. 6, April 26, 

 1884, p. 404. (Hacienda Los Sabalos, Chontales, Nicaragua.) 



Bill large and strong ; male narrowly barred black and white, with 

 black more prominent on upper surface ; female buffy white barred 

 with black, narrowly on lower surface, more heavily above. 



