BIRDS OF NORTH AND MIDDLE AMERICA 381 



c. With whitish shaft stripes On the latei'al occipital feathers, giving an ap- 

 pearance of a discontinuous white narrow border to the brown color. 

 d. Sides and flanks darker and browner — buffy brown (mountain slopes of 

 eastern Mexico from Tamaulipas to Puebla). 



Dactylortyx thoracicus thoracicus (p. 382) 

 dd. Sides and flanks paler and grayer — fairly pale drab (Yucatan Peninsula). 



Dactylortyx thoracicus sharpei (p. 385) 

 cc. With buffy to ochraceous shaft stripes on the lateral occipital feathers. 

 d. Tarsus longer, averaging about 36 mm., toes longer, middle toe without 

 claw averaging about 31.5 mm. (central Chiapas to western Guatemala). 

 Dactylortyx thoracicus chiapensis (p. 386) 

 dd. Tarsus shorter, averaging 34.5 mm. or less ; toes shorter, middle toe 

 without claw averaging under 30 mm. 

 e. Pale shaft stripes of breast, uppper abdomen, and sides broad and 

 slightly buffy (southeastern Oaxaca and adjacent western Chiapas). 

 Dactylortyx thoracicus lineolatus (p. 385) 

 ee. Pale shaft stripes of breast, upper abdomen, and sides very narrow and 

 white. 

 /. Larger, wings averaging 130 mm. in length (Mount Cacaguatique, 



El Salvador) Dactylortyx thoracicus taylori (p. 388) 



//. Smaller, wings averaging 126 mm. in length. 



g. Dark portions of underparts paler, with a pale cinnamon-buffy wash 

 (Volcan San Miguel, El Salvador). 



Dactylortyx thoracicus salvadoranus (p. 387) 

 gg. Dark portions of underparts darker, with a decidedly dusky earth- 

 brown tone, with no pale cinnamon-buffy wash (Honduras). 



Dactylortyx thoracicus fuscus (p. 389) 

 aa. Chin, throat, cheeks, and superciliaries with no orange-tawny, but whitish or pale 

 grayish brown to grayish vinaceous (females). , 

 b. Underparts of body very dark — tawny cinnamon-brown (Honfiuras). 



Dactylortyx thoracicus fuscus (p. 389) 

 bb. Underparts of body paler — orange cinnamon or paler. ' 

 c. Chin and throat strongly tinged with pale vinaceous. 



d. Middle of lower abdomen deep warm buff or darker (Jalisco to Guerrero) . 



Dactylortyx thoracicus devius (p. 383) 

 dd. Middle of lower abdomen buff white (Tamaulipas to Puebla). 



Dactylortyx thoracicus thoracicus (p. 382) 

 cc. Chin and throat whitish, little, if any, tinged with pale vinaceous. 



d. Very pale below ; pale buffy white of abdomen extending to lower margin 



of breast (Yucatan) Dactylortyx thoracicus sharpei (p. 385) 



dd. Darker and more rufescent below, whitish area limited to posterior part of 

 abdomen. 

 e. Feet slightly larger, middle toe without claw averaging 29.5 mm. or 

 more (central Chiapas to western Guatemala). 



Dactylortyx thoracicus chiapensis (p. 386) 

 ee. Feet slightly smaller, middle toe without claw averaging less than 28 



mm. (El Salvador) Dactylortyx thoracicus taylori (p. 388) 



Dactylortyx thoracicus salvadoranus ■" (p. 387) 



" Female of D. t. lineolatus not known. 



