184 



BULLETITSr 50, UNITED STATES NATIONAL MUSEUM. 



Range. — Isthmus of Panama (Chiriqui) to Boli\ia and southorn 

 Brazil. (Eight species, all South American, one of them ]>arel3' pass- 

 ing the Isthmus of Panama.) 



OSTINOPS DECUMANUS (Pallas). 



CRESTED OROPENDOLA. 



Adult male. — General color uniform, rather glossy, black, or brown- 

 ish black (sometimes with a slight purplish reflection in certain lights); 

 rump and upper tail-coverts dark purplish chestnut or baj^ the under 

 tail-coverts similar but lighter (more burnt sienna); tail rich lemon 

 yellow, with middle pair of rectrices black; bill pale greenish yellow; 

 legs and feet black; length (skins), 416.6-463.6 (433.1); wing, 215.9- 

 250.2 (236); tail, 185.4-221 (202.2); culmen, 55.9-66.5 (62.2); depth of 

 bill at base, 25.9-30 (28.2); width of maxilla between lores, 10.2-13 

 (ll.Y); tarsus, 48.3-55.4 (51.3); middle toe, 34.3-40.6 (37.6).^ 



Adult femcde. — Similar in coloration to the adult male but much 

 smaller, with crest less developed; length (skins), 317.5-355.6 (326.6); 

 wing, 158.8-186.7 (169.2); tail, 134.6-177.8 (151.9); culmen, 42.9-50.8 

 (46.7); depth of bill at base, 20.3-22.9 (21.8); width of culmen between 

 lores, 7.9-9.9 (9.1); tarsus, 38.6-43.2 (41.1); middle toe, 27.2-30.5 

 (29.2).^ 



Young. — Similar to adults, but the black duller, the chestnut of 

 rump, etc., less bright and much less sharply defined, and the bill pale 

 yellowish brown or dull brownish white instead of pale greenish 



^ Eleven specimens. 

 ^ Ten specimens. 



Specimens from eastern Ecuador average larger, tliosefrom southern Brazil smaller, 

 averages being as follows: 



Middle 

 toe. 



M.\LES. 



Six adult males from Colombia (including 



Panama and Chiriqui) 226.8 199.1 62.5 28.2 11.2 51.1 38.4 



Three adult males from Rio Napo, eastern 



Ecuador 252 216.9 64.8 27.9 12.7 53.3 36.6 



Two adult males from Chapada, Matto- 



Gros.so, southwestern Brazil 239 188 57.7 28.7 11.9 49.8 35.8 



FEMALES. 



Five adult females from Colombia 176.3 161.5 49.8 22.1 9.4 42.7 29.7 



One adult female from Rio Napo, eastern 



Ecuador 170.9 149.9 45.7 22.4 9.7 43.2 30 



Four adult females from Chapada, Matto- 



Grosso, southwestern Brazil 159.8 139.7 37.1 21.1 8.6 39.1 27.7 



