BIRDS OF NORTH AND MIDDLE AMERICA 577 



MICRASTUR RUFICOLLIS INTERSTES Bangs 



Costa Rican Barred Forest Falcon 



Adult male. — Similar to that of Micrastur rujicollis guerilla, but slight- 

 ly darker above, dark neutral gray; chin and throat light neutral gray; 

 rest of underparts darker than in guerilla, the dark bars somewhat 

 broader and not thinning out so much on the lower abdomen; the 

 white interspaces slightly clouded with pale grayish. 



Adult female.- — Similar to that of Micrastur rujicollis guerilla, but a 

 little browner, brighter sepia above, and darker below, the dark bars 

 wider and blacker, the chin and throat darker, mouse gray to pale, 

 hair brown. 



Juvenal (sexes alike) .—Indistinguishable with certainty from those 

 of Micrastur rujicollis guerilla but averaging darker, more fuscous, 

 above. Both phases are represented. 



Natal down. — Not known. 



Adult male.— Wing 161-180 (168); tail 155-177 (166.1); culmen 

 from cere 14-15 (14.9) ; tarsus 53.5-65 (56.1) ; middle toe without claw 

 28.5-30 (29.2 mm.).^" 



Adult female.— Wing 165-180 (173.8); tail 150-180 (167.5); culmen 

 from cere 14-17 (15.8) ; tarsus 53-60 (56.8) ; middle toe without claw 

 29-31 (30 mm.)." 



Range. — Resident from Costa Rica (Monte Redondo, Boruca, 

 Estrella de Cartago, Jimenez, Volcan de Irazu, Talamanca, Pozo del 

 Pital, Carrillo, Guayabo, Tenorio, Tuco, Pozo Azul de Pirris, Buenos 

 Aires) and Panama (Panama Railway, Calovebora, Calobre, Volcan 

 de Chiriqui; Lion Hill, Divala, Perme) south through western Co- 

 lombia (Dabeiba, La Vieja, No vita, Andagoya, San Jose, Las Lomitas, 

 San Antonio, Salencio, Salento) to western Ecuador (Gualea, Chimbo, 

 Surupata, Verdecocha, Bucay, Rio de Oro, Zaruma, El Chiral). 

 Type locality.— L^ Estrella de Cartago, Costa Rica. 



Micrastur gilvicollis (not Sparvius giivicollis Vieillot) Lawrence, Ann. Lye. Nat. 

 Hist. New York, vii, 1862, 317 (Panama Railway). 



Micrastur guerilla (not of Cassin) Sclater and Salvin, Proc. Zool. Soc. London, 

 1869, 367, part (monogr.); Norn. Av. Neotr., 1873, 120, part. — Salvin, Proc. 

 Zool. Soc. London, 1870, 216 (Calovebora, Veraguas, w. Panama). — Ridg- 

 WAT, Proc. Acad. Nat. Sci. Philadelphia, 1875, 486, part (Calovdbora and 

 Calobre, Veraguas, and Volcan de Chiriqui, w. Panama; Costa Rica); Ibis, 

 1876, 3, part (diagnosis). — Berlepsch and Taczanowski, Proc. Zool. Soc. 

 London, 1883, 574 (Chimbo, Ecuador); 1884, 310 (Surupata, Ecuador). — 

 Gurnet, List Diurn. Birds Prey, 1884, 25, part; Cat. Birds Prey, 1894, 19, 

 part. — Zeledon, Anal. Mus. Nac. Costa Rica, i, 1887, 126 (Monte Redondo, 

 Costa Rica). — Cherrie, E.xpl. Zool. Merid. Costa Rica, 1893, 50 (Boruca, 

 sw. Costa Rica). — Sharpe, Hand-list, i, 1899, 246, part.— Salvin and God- 



«8 Eight specimens from Costa Rica, Panama, and Ecuador. 

 " Four specimens from Costa Rica and Panama. 



