BIRDS OF NORTH AND MIDDLE AMERICA 343 



Buteo magnirodris conspectus Peters, Check-list Birds of World, i, 1931, 237. — 

 Brodkorb, Occ. Pap. Mus. Zool. Univ. Michigan, No. 425, 1940, 3 (spec; 

 Yucatdn: San Ignacio, Chichen Itzd, Rio Lagartos; Quintana Roo: Camp 

 Mangel, Xcopen; British Honduras: Cayo, Belize, Toledo District). — 

 Traylor, Publ. Field Mus. Nat. Hist., zool. ser., xxiv, 1941, 203 (Chichen Itzd; 

 Yucatdn; spec). 



Rupornis ruficauda gracilis (not R. gracilis Ridgway) Swann, Synop. Accip., ed. 2, 

 1922, 93, part (Yucatdn). 



BUTEO MAGNIROSTRIS PETERSI Brodkorb 



Tehuantepec Insect Hawk 



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

 cauda but less rufescent below, the ground color of the abdomen, 

 sides, thighs, and vent almost pure white, the bro^vn bars on the 

 breast and upper abdomen more distinct, not tending to run together 

 along the shaft; upper breast and throat clearer grayish, as in Buteo 

 magnirostris conspectus. 



Juvenal (sexes alike) . — Similar to that of Buteo magnirostris griseo- 

 cauda but differing in the same particulars as do the adults. 



Natal down. — Not known. 



Adult male.— Y^'ing 223-235 (226); tail 153-166.5 (160.9); culmen 

 from cere 17.5-19.7 (18.3); tarsus 64.9-68.4 (66.5) ; middle toe without 

 claw 29.5-31.1 (30.1 mm.).^ 



Adult female.— Wing 240-246 (243.2); tail 162-170 (166.9), culmen 

 from cere 18.6-21.6 (20.1), tarsus 65.4-68.6 (66.5); middle toe without 

 claw 29.2-33.8 (31.8 mm.).^^ 



Range. — Resident in the arid Pacific slope of the Isthmus of 

 Tehuantepec, southeastern Oaxaca, and in adjacent southwestern 

 Chiapas (Arriaga, Tonald, Pijijiapan). 



Type locality. — Above Arriaga, Chiapas. 



Asturina ruficauda Sclater and Salvin, Nom. Av. Neotr., 1873, 118, part 



(Mexico). 

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



part (Tehuantepec). 

 Buteo {Rupornis) magnirostris c. var. griseocauda Ridgwav, Proc. Boston Soc. Nat. 



Hist., xvi, 1873, 65, part (Tehuantepec, Oaxaca), 88, part (syn. ; distr.). 

 Buteo {Rupornis) magnirostris var. griseocauda Ridgway, Proc. Boston Soc. Nat. 



Hist., xvi, 1873, 87, part (descr.). 

 Buteo magnirostris griseocauda Peters, Check-list Birds of World, i, 1931, 237, 



part. 

 Rupornis griseicauda Sharpe, Hand-list, i, 1899, 258, part. 

 Rupornis magnirostris griseicauda Swann, Synopt. List Accip., pt. 2, 1919, 55, 



part; Synop. Accip., ed. 2, 1922, 92, part; Monogr. Birds Prey, i, 1930, 440, 



*^ Seven specimens from Chiapas; Tonald, Pijijiapan, Arriaga, and Tehuantepec 

 City, Oaxaca. 



*3 Four specimens from Chiapas: Tonala, Pijijiapan, Arriaga, and Tehuantepec 

 City, Oaxaca. 



