184 BULLETITSr 50, UNITED STATES NATIONAL MUSEUM. 



^aw^e.— Isthmus of Panama (Chiriqui) to Bolivia and southern 

 Brazil. (Eight species, all South American, one of them barely pass- 

 ing the Isthmus of Panama.) 



. OSTINOPS DECUMANUS (Pallas). 

 CRESTED OBOFENSOLA, 



AcImU 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 bay, 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, 216.9- 

 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 

 (11.7); tarsus, 48.3-65.4 (51.3); middle toe, 34.3-40.6 (37.6).' 



AdMlt female. — 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, those from southern Brazil smaller, 

 averages being as follows: 



Locality. 



Wing. 



Tail. 



Culmen, 



Depth 

 of bill 

 at base. 



Width 

 of cul- 

 men be- 

 tween 

 lores. 



Tarsus. 



Middle 

 toe. 



MALES. 



Six adult males from Colombia (including 

 Panama and Chiriqui) 



Three adult males from Rio Napo, eastern 

 Ecuador 



Two adult males from Chapada, Matto- 

 Grosso, southwestern Brazil , 



FEMALES. 



Five adult females from Colombia 



One adult female from Rio Napo, eastern 



Ecuador 



Four adult females from Chapada, Matto- 



Grosso, southwestern Brazil 



226.8 



252 



239 



176.3 

 170.9 

 159.8 



199.1 

 216.9 

 188 



161.5 

 149.9 

 139.7 



62.6 

 64.8 

 57.7 



49.8 

 45.7 

 37.1 



28.2 

 27.9 

 28.7 



22. 1 

 22.4 

 21.1 



11.2 

 12.7 

 11.9 



9.4 

 9.7 

 8.6 



51.1 

 53.3 

 49.8 



42.7 

 43.2 

 39.1 



35.8 



29.7 



30 



27.7 



