FAMILY ACCIPITRIDAE 2l5 



from the mainland. Hawks of this species seen on Isla Taboguilla 

 are assigned here on basis of probability. I have not recorded it on 

 Isla Taboga, where it is probable that it has been killed off through 

 the long period of extensive settlement on this island. 



An occupied nest seen on January 21, 1956, on Isla Coiba was 

 placed about 12 meters from the ground in a tree of moderate size 

 that stood in a second-growth thicket. A hawk was noted carrying 

 nesting material on March 8, 1948, near Santa Maria, Herrera, and 

 in the month of April I have seen them regularly in pairs in the 

 Pacora-Chepo area. 



While the usual name for these hawks throughout the republic is 

 cuiscui in imitation of the call, near Sona they were called guifio. 



This subspecies was known long under the name riificauda, from 

 Asturiim ruficatida Sclater and Salvin (Proc. Zool. Soc. London, 

 1869, p. 133). With the location of this form in the genus Buteo 

 this is preoccupied by Accipiter ruficaudus Vieillot, 1807, which is a 

 synonym of Buteo jainatcensis borealis (Gmelin). Accordingly the 

 race under discussion was named petulans by van Rossem as in- 

 dicated in the citation in the heading. 



BUTEO MAGNIROSTRIS INSIDIATRIX (Bangs and Penard) 



Rupornis magnirostris insidiatrix Bangs and Penard, Bull. Mus. Comp. Zool., 

 vol. 62, April, 1918, p. 36. (Bonda, Magdalena, Colombia.) 



Characters. — Differs from B. m. petulans in lighter gray of dorsal 

 surface, with the light-colored tail bands dark gray, in some with a 

 faint tinge of cinnamon-buff; whiter below on the light interspaces, 

 with the dark bands grayer, less rufescent, varying from huffy brown 

 to warm brown, occasionally brighter sayal brown centrally. 



Measurements. (The series measured is mainly from northern 

 Colombia).— Males (19 specimens), 207-219 (213.3), tail 135-157 

 (147.5), culmen from cere 16.4-19.9 (17.6), tarsus 60.0-65.0 (62.8) 

 mm. 



Females (14 specimens), wing 217-234 (222.0), tail 138-164 

 (147.1), culmen from cere 17.3-19.8 (18.6), tarsus 57.8-67.8 (63.6) 

 mm. 



Resident. Caribbean slope throughout the Comarca de San Bias 

 (Mandinga; Perme; Armila; Obaldia) ; on the Pacific side on the 

 Rio Chucunaque (mouth of Rio Tuquesa), and the middle Rio Tuira 

 and its tributaries (Pucro, Boca de Paya). Birds from the lower 

 Chucunaque (Yaviza), and the lower Tuira (Marraganti; El Real) 

 are intermediate toward petulans. 



