214 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 150 



The measurements are similar to those of the next race, B. in. 

 petulans. 



Resident. Fairly common in Bocas del Toro, from the Costa Rican 

 border through Changuinola and Almirante to Cricamola; Isla 

 Colon, Isla Cristobal, Isla Pastores. 



This is a form of southern Central America from eastern Honduras 

 south to Costa Rica, that reaches its most southerly point in the low- 

 lands around the Laguna de Chiriqui. 



A female taken along the Changuinola Canal on February 20, 1958, 

 was nearly ready to lay. 



Kennard and Peters (Proc. Boston Soc. Nat. Hist., vol. 38, 1928, 

 p. 449) record the eye in the adult as varying from barium yellow 

 to cinnamon buff and pinard yellow ; and in the immature as russet. 



BUTEO MAGNIROSTRIS PETULANS van Rossem 



Buteo magnirostris petulans van Rossem, Condor, vol. Z7, no. 4, July 15, 1935, 

 p. 215. (Lion Hill, Canal Zone, Panama.) 



Characters. — Differs from B. m. argutus in grayer coloration : less 

 brownish on upper surface, foreneck, and upper breast; light tail 

 bands entirely or mainly rufous ; light interspaces on lower surface 

 white to very pale buff. 



Measurements. — Males (8 specimens), wing 205-215 (209), tail 

 132-151 (144), culmen from cere 16.5-17.5 (17.1, average of 6), 

 tarsus 55.0-64.5 (60.5) mm. 



Females (16 specimens), wing 215-227 (221), tail 141-163 (153), 

 culmen from cere 17.8-20.2 (19.2, average of 15), tarsus 60.0-66.5 

 (63.5) mm. 



Resident. Pacific slope, from Chiriqui, where it ranges to 1,200 

 meters in the mountains, eastward to the southern shores of Golfo 

 de San Miguel (Garachine) in the lowlands of Darien ; on the 

 Caribbean side from northern Code (El Uracillo) east through the 

 Province of Colon and the Canal Zone ; Isla Parida ; Isla Coiba ; Isla 

 Taboguilla ; Isla Iguana, off the coast of Los Santos. Intergrades with 

 the race insidiatrix on the lower Rio Tuira. Birds from the lowlands 

 below Pacora and Chepo have the light tail bands grayer, less rufous, 

 and thus tend toward insidiatrix, but otherwise agree with petulans, 

 and are placed with that race. 



As I have seen no specimens from eastern Bocas del Toro, or from 

 the Caribbean slope of Veraguas, this area is omitted in the range 

 given above. On the Pacific side this race extends throughout the 

 Azuero Peninsula, where I have specimens from the southern end 

 at Tonosi and Pedasi. Six skins from Isla Coiba agree with the series 



