500 BULLETIN oO, UNITED STATES NATIONAL MUSEUM. 



MITREPHANES PH^OCERCUS TENUIROSTRIS Brewster. 

 SLENDER-BILLED FLYCATCHER. 



Similar to M. p. phseocercus, but avera^ino; larger and coloration 

 decidedly paler, the pileum often strongly tinged with cinnamomeous, 

 the back, etc., light buffy olive, the chest between tawny-qchraceoiis . 

 and clay color, fading into slightly 3'ellowish buff on abdomen, flanks, 

 and under tail-coverts. 



Young. — Above deep broccoli brown (the pileum darker, more 

 sepia), the feathers' conspicuoush^ but narrowly tipped with buffy; 

 middle and greater wing-coverts broadly tipped with cinnamon-buff, 

 and inner secondaries broadly edged vv^ith same; otherwise like adults, 

 but feathers on sides of neck, chest, and sides of breast very narrowly 

 and indistinctly tipped with paler. 



Adult maZe.— Length (skins), 122-132 (126); wing, 72-76 (74.1); 

 tail, 59.5-66 (62.2); exposed culmen, 9.5-11.5 (10.5); tarsus, 12-14 

 (12.8); middle toe, 6.5-7.5 (7.1).« 



Adult female.— Ijen^ih (skins), 122-130 (124); wing, 68.5-73.5 

 (70.5); tail, 57-64.5 (60.2); exposed culmen, 9.5-11 (10.1); tarsus, 

 11.5-13 (12.7); middle toe, 6.5-7.5 (7.1).^ 



Western Mexico, in States of Sonora (Oposura; Alamos), Chihua- 

 hua (Pinos Altos; Mina Abundancia), Durango (El Salto; Chacala; 

 Durango City), Zacatecas (Sierra de Valparaiso); Sinaloa (Mazatlan; 

 Presidio, near Mazatlan), Jalisco (La Laguna; San Sebastian; near 

 Bolanos), and Guerrero (Amula; Omilteme.; mountains near Chilpan- 

 cingo), and Territory of Tepic (Santa Teresa). 



{Mitrephorus] phxocercus Sclater and Salvin, Nom. A v. Neotr., 1873, 51, part. 



Mitrephorus phR'ocercufi (not of Sclater) Lawrence, Mem. Best. Soc. N. H., ii, 1874, 

 287 (Mazatlan). 



Mitrephanes phseocercus Sclater, Vsii. Birds Brit. Mus., xiv, 1888, 219, part (Pre- 

 sidio, near Mazatlan; Ciudad Durango). — Salvin and Godman, Biol. Centr.- 

 Am., Ave-s, ii, 1889, 66, part (^Oposura, Sonora; Presidio, near Mazatlan; 



a Seventeen specimens. 

 b Eleven specimens. 



Specimens from Jalisco, Durango, Michoacan, and Guerrero are more or less inter- 

 mediate between this form and M. p. phxocercus. 



