342 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



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



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



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



part (monogr.). 

 Buteo magnirosiris saniusi van Rossem, Ann. Mag. Nat. Hist., 1939, ser. 11, 



vol. 9, 440 (Rio Armenia, Colima, Mexico; orig. descr.; crit.; meas.). — Davis, 



Condor, xlvi, 1944, 10 (Guerrero, Mexico; spec). 



BUTEO MAGNIROSTRIS CONSPECTUS (Peters) 



YucatXn Insect Hawk 



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

 cauda, but averaging slightly smaller; paler and purer gray (less 

 brownish) above; slightly paler below. 



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

 cauda, but upperparts paler, drab to pale hair brown, as against fus- 

 cous to olive-bro\vn in griseocauda, and averaging slightly smaller. 



Natal doum. — Not known. 



Adult male.— Wing 219-226 (222.5); tail 155-171.5 (162.4); culmen 

 from cere 17.8-20 (18.6); tarsus 62.8-67.5 (63.3); middle toe without 

 claw 29.9-34.5 (31.6 mm.) (4 specimens). 



Adult female.— Wing 220-237 (229.7); tail 155.5-165.9 (160.9); 

 culmen from cere 17.6-20.5 (19.2); tarsus 63-65.7 (64.4); middle toe 

 without claw 33.4-35 (34.4 mm.) (8 specimens). 



Range. — Resident in the Yucatdn Peninsula (San Ignacio, Chichen 

 Itzd, Rio Lagartos, Quintana Roo, Ycopen, Chunyaxclie),and Tabasco 

 (Frontera, Monteeristo), and Campeche to northern British Honduras. 



Type locality. — San Ignacio, Yucatdn. 



Asturina magnirostris (not Falco magnirostris Gmelin) Lawrence, Ann. Lye. 

 Nat. Hist. New York, ix, 1869, 207 (M^rida, Yucatdn). 



Asturina ruficauda (not of Sclater and Salvin, 1869) Boucard, Proc. Zool. Soc. 

 London, 1883, 456 (Yucatan). 



Rupornis ruficauda Stone, Proc. Acad. Nat. Sci. Philadelphia, 1890, 204 (com- 

 mon, Izamal, Yucatdn). — Chapman, Bull. Amer. Mus. Nat. Hist., viii, 

 1896, 286 (Chichen Itzd, Yucatiin), — Salvin and Godman, Biol. Centr.- 

 Amer., Aves, iii, 1900, 76 part (Yucatan). 



Rupornid ruficauda griseicatida Ridgway, Proc. U. S. Nat. Mus., viii, 1885, 94, 

 in text, part (Yucatdn). — Cole, Bull. Mus. Comp. Zool., 1, 1906, 121 

 (Chichen Itzd,). 



Asturina magnirostris var, griseocauda Rovirosa, La Naturaleza, vii, 1887, 375 

 (Tabasco) . 



Rupornis magnirostris conspecta Peters, Auk, xxx, 1913, 370 (San Ignacio, 

 Yucatdn; coll. Mus. Comp. Zool.). — Swann, Synopt. List. Accip., pt. 2, 1919, 

 56; Synop. Accip., ed. 2, 1922, 92; Monogr. Birds Prey, i, 1930, 440 (monogr.). — 

 Griscom, Amer. Mus. Nov., No. 235, 1926, 12 (e. Quintana Roo, Yucatdn). — 

 Peters and Griscom, Proc. New England Zool. Club, xi, 1929, 45 (crit.; 

 characters; distr.). — Bangs, Bull. Mus. Comp. Zool., Ixx, 1930, 190 (type 

 spec, in Mus. Comp. Zool.). 



