_Diagnosis._--Coloration of adult male: Frontals, supralorals, malars, and chin White; orbital ring White; auriculars and nape grayish brown; rest of head smoke gray; back, scapulars, wing coverts, rump, and upper tail coverts plain Bluish Black; rectrices (except middle pair) with large patch of White midway between base and tip, rest plain Bluish Black; chest, breast, and anterior parts of sides plain Bluish Gray-Green, much lighter than back, and fading into paler Gray on throat; abdomen and thighs White; flanks and posterior part of sides Olive-Yellow or Yellowish Olive; under tail coverts Lemon Yellow; bill, legs and feet Black. Coloration of adult females: Head plain Smoke Gray, passing into White on frontals, malars, and chin; back, scapulars, wing coverts, and rump Hair Brown; upper tail coverts Dark Gull Gray; remiges and rectrices Black with faint Dusky Green gloss, edged with Gull Gray; chest Dark Grayish Brown lightening to Wood Brown on sides and flanks; abdomen White; under tail coverts Yellow Ocher. Coloration of young: As in adult female, but paler throughout. _Measurements._--In adult male, wing 94.0, and tail 104.2; in adult female, wing 93.3, and tail 94.8; both sexes, culmen 11.1, and tarsus 18.7. _Range._--Mountainous districts of central and southern Mexico, in states of Durango, Zacatecas, Hidalgo, Mexico, Oaxaca, Colima, Morelos, Veracruz, San Luis Potosi, Guerrero and Michoacan. =Ptilogonys cinereus molybdophanes= Ridgway Ashy Ptilogonys _Ptilogonys cinereus molybdophanes_ Ridgway, Man. N. American Birds, 464 (footnote), 1887. _Diagnosis._--Coloration of adult male: Upper parts darker bluish than in _P. c. cinereus_; venter paler; flanks Olive-Green rather than Olive as in _P. c. cinereus_. Coloration of adult female: Like female of _P. c. cinereus_ but colors darker throughout; dorsum more olivaceous. _Measurements._--In adult male, wing 89.4, and tail 97.1; in adult female, wing 89.4, and tail 93.3; both sexes, culmen 11.7, and tarsus 17.3. _Range._--Western Guatemala, in subtropical and temperate zones. =Ptilogonys caudatus= Cabanis Costa Rican Ptilogonys _Ptilogonys caudatus_ Cabanis, Jour. fuer Orn., 1866:402, Nov. 1866.