180 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



GYMNOSTINOPS MONTEZUMA (Lesson). 

 MONTEZUmA OROPENDOIA. 



Adult male. — Head, neck, and upper part of chest uniform black; 

 tail i-ich lemon yellow, the middle pair of rectrices brownish black; 

 rest of plumage rich purplish chestnut, or bay, darker on under parts 

 of the body, especially the thighs, the feathers of breast and abdomen 

 being black beneath the surface; tips of longer primaries (beyond 

 emarginations) and whole under surface of wings brownish black; 

 basal half, or more, of bill black, the terminal portion yellowish (more or 

 less orange or orange-red in life); naked skin around base of culmen 

 and bare suborbital and malar spaces flesh color, pale bluish, or rose- 

 pink in life;, iris brown; legs and feet black; length (skins), 450.9- 

 620.7 (491); wing, 245.1-273.1 (260.9); tail, 186.9-205.2 (197.4); cul- 

 men, 73.7-78.7 (77); greatest width of culmen near base, 13.7-16.3 

 (14.7); tarsus, 54.6-60.2 (56.6); middle toe, 39.9-44.5 (42.4).^ 



Adult female. — Similar to the adult male, but much smaller; black 

 of head and neck duller or browner; middle rectrices blackish brown, 

 instead 6i black, and the median under parts and thighs darker, some- 

 times approaching brownish black; length (skins), 368.2-406.4 (381.3); 

 wing, 188-205.7 (196.3); tail, 144.8-159.5 (152.4); culmen, 56.4-61 

 (68.9); width of culmen near base, 10.2-12.4 (11.2); tarsus, 44.5^6.3 

 (45.2); middle toe, 31.2-38.5 (32.5).' 



Young. — Similar to adults, but dark portion of bill not so deep black 

 and pale terminal portion less distinctly yellowish; the line of demar- 

 cation between the two areas less distinct. 



Southeastern Mexico, in States of Tamaulipas (Alta Mira) and Vera 

 Cruz (Santa Maria, Orizaba, Cordova, Jalapa, Actopam, Barra de 

 Santa Ana, Paso de la Milpa, etc.), south through Central America to 

 Isthmus of Panama (Lion Hill Station, Panama Railroad). 



^ Seven specimens. 



'' Five specimens. 



Specimens from different localities average as follows: 



Locality. 



Wing. 



Tail. 



Culmen. 



Width 



of 

 frontal 

 shield. 



Tarsus. 



Middle 

 toe. 



MALES. 



Two adult males from southern Mexico 



One adult male from Guatemala 



Three adult males from Nicaragua and Costa Rica. . 

 One adult male from Panama 



FEMALES. 



Two adult females from southern Mexico 



Two adult females from Honduras 



One adult female from Costa Rica 



271.8 

 264.2 

 263.5 

 257. .S 



202.4 

 194.3 

 188 



202.9 

 198.6 

 191.3 

 193 



157.2 

 152.7 

 144.8 



75.9 

 76.7 

 77 

 77 



57.7 

 59.7 

 69.7 



14 

 14 

 15.2 

 16.3 



10.4 

 11.9 

 10.7 



54.9 

 56.4 

 56.6 

 ■60. '2 



45.6 I 

 45.2 I 

 44.5 I 



42.2 

 39.9 

 43.4 



38.3 



32 



31.2 



