FAMILY ACCIPITRIDAE 195 



Measurements.— Males, wing 162-178 (171), tail 134-152 (140.8). 

 culmen from cere 9.5-1 1 ( 10.3) , tarsus 46-54 (49.9) mm. 



Females, wing 195-210 (200), tail 150-179 (165.6), culmen from 

 cere 10.5-14 (12.7), tarsus 45-58.5 (54.9) mm. 



Migrant from the north to western Panama ; rare. 



Arce secured one on the Volcan de Chiriqui (Salvin, Proc. Zool. 

 Soc. London, 1870, p. 216) ; Mrs. Davidson collected a male February 

 15, 1934, at 650 meters on Horqueta, above Boquete (Davidson, Proc. 

 California Acad. Sci., vol. 23, 1938, p. 256), preserved in the Cali- 

 fornia Academy of Sciences. There is one in the Monniche collection 

 in the Chicago Natural History Museum taken at about the same 

 elevation at Quiel, above Boquete, October 24, 1937 (Blake, Fieldiana: 

 Zool., vol. 36, 1958, p. 505). A specimen in the British Museum, 

 "obtained through Boucard from Panama" (Salvin and Godman, 

 Biol. Centr-Amer., vol. 3, 1897, p. 50) probably was collected by Arce. 

 Stone (Proc. Acad. Nat. Sci. Philadelphia, 1918, p. 249) was in error 

 in listing this species from the Canal Zone. 



The sharp-shinned hawk undoubtedly is more regular in occurrence 

 than the few records indicate. While I have not taken specimens, I 

 saw this species near Cerro Punta, Chiriqui on March 7, 1955, when 

 one circled a hundred meters in the air at sunrise near our house, and 

 again the following day when I recorded one flying at the edge of 

 the forest above the village. Near Monagrillo, Herrera, on February 

 25, 1948, I saw one close at hand in thick brush, and on March 15, 

 1957, near Pedasi, Los Santos, one circled over the pastures near the 

 Rio Pedasi for several minutes. 



The sharpshin ranges in brushy areas, or in forest, often in under- 

 growth. In hunting the small birds that form its food it may dash 

 across the borders of fields or pastures. 



BUTEO ALBICAUDATUS HYPOSPODIUS Gurney: White-tailed Hawk; 



Gavilan Tej6 



Biiteo hypospodius Gurney, Ibis, ser. 3, vol. 6, no. 1, Jan. 1876, p. 73, pi. 3. 

 (Medellin, Antioquia, Colombia.) 



Adult in light phase, white underneath, with dark head, dark wing 

 tips, and a dark band at the end of the tail. 



Description. — Length 500 to 610 mm. Adult, above mainly slate 

 gray, including the sides of the head, the feathers of upper back 

 with concealed white bases ; lesser wing coverts cinnamon, with 

 scapulars tinged with the same ; outer webs of primaries and tips 

 black; lower back, rump, and upper tail coverts white, barred with 



