350 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Buteo mngnirostns petnlans van Rossem, Condor, xxxvii, 1935, 215 (new name 

 for B. m. rvficauda, not Accipiter ruficaudus Vieillot, 1807). — Sassi, Tem- 

 minckia, iii. 1938, 298 (Costa Rica; Rio Tigre at Puerto Jimenez; spec; 

 crit.). 



BUTEO MAGNIROSTRIS AUUS (Peters and Griscom) 



San Miguel Insect Hawk 



Adult (sexes alike) . — SimOar to that of Buteo magnirostris petulans, 

 but the rufous color of the wings and tail paler, that of the latter washed 

 with grayish; feathers of the breast with two incomplete white bars, 

 producing a spotted appearance; barring of the abdomen coarser and 

 slightly darker; the longest under wing coverts unspotted or with 

 only a faint subterminal spot; averaging very slightly smaller. 



Juvena I . — Unknown . 



Natal down. — Unknown. 



Adult male. — Wing 207; tail 142; culmen from cere 19; tarsus 69; 

 middle toe without claw^ 33 mm. (1 specimen). 



Adult female.— Wing 219-226 (221.3); tail 159-163 (160.7); culmen 

 from cere 20-20.5 (20.2); tarsus 68-70 (09); middle toe without claw 

 32.5-33 (32.7 mm.) (3 specimens). 



Range. — Resident and wholly confined to El Eey, Pearl Islands, 

 Bay of Panama; absent from the smaller islands of the group. 



Type locality. — El Rey, Pearl Islands. 



Asturina ruficauda Sharpe, Cat. Birds Brit. Mus., i, 1874, 205, part (Pearl 



Islands, Bay of Panama). 

 Rupornis ruficauda Salvin and Godman, Biol. Centr. Amer., Aves, iii, 1900, 76, 



part (Pearl Islands, Panama). — Thayer and Bangs, Bull. Mus. Comp. 



Zool., xlvi, 1905, 144 (San Miguel Island, Bay of Panama). 

 Rupornis magnirostris alia Peters and Griscom, Proc. New England Zool. Club, 



xi, 1929, 48 (crit.; characters; distr. ; orig. descr.). — Bangs, Bull. Mus. Comp. 



Zool., Ixx, 1930, 190 (type specimen in Mus. Comp. Zool.). 

 Buteo magnirostris alius Peters, Check-list Birds of World, i, 1931, 238. — 



Griscom, Bull. Mus. Comp. Zool., Ixxviii, 1935, 299 (El Rey Island, Pearl 



Islands, Panama). — Murphy, Auk, Ixii, 1945, 116 (Pearl Islands, Panama).— 



Wetmore, Smiths. Misc. Coll., cvi. No. 1, 1946, 27 (San Jos6, Pearl Islands, 



Panama). 



BUTEO MAGOTROSTRIS INSIDIATRIX (Bangs and Penard) 



Santa Marta Insect Hawk 



Adult (sexes alike). — Similar to that of Buteo magnirostris petulans 

 in the coloration of the upperparts, but averaging paler, pale drab gray 

 to neutral gray, but the pale interspaces of the tail pure gray without a 

 trace of rufous; throat and breast uniform pale gray; the posterior 

 underparts and tibiae barred as in petulans, but with no or only a 

 very faint rufous wash. 



Juvenal (sexes alike) . — Similar to that of Buteo magnirostris petulans, 

 but paler gray above; less washed with rufous on the posterior un- 

 derparts; pale interspaces of the rectrices gray, not rufous. 



