BIRDS OF NORTH AND MIDDLE AMERICA 523 



GERANOSPIZA NIGRA LIVENS Bangs and Penard 



SoNORAN Frog Hawk 



Adult (sexes alike). — Similar to that of Geranospiza nigra balzarensis, 

 but larger and very slightly darker and the white tips of the feathers 

 of the thighs and flanks more conspicuous. 



Immature . — Unknown . 



Juve nal. — Unknown . 



Natal down.— Not known. 



Adult male.— Wing 320.5-334 (327.1); tail 233-260; culmen from 

 cere 19-; tarsus 88-91; middle toe without claw 33.5-34 mm.^^ 



Adult female. — Wing 349; tail 242; culmen from cere 22; tarsus 

 97 mm.'^2 



Range. — Northwestern Mexico in southern Sonora. Known only 

 from the type locality, Alamos, and from Guirocoba and Tesia in the 

 lower Mayo River Valley. 



Type locality. — Alamos, southern Sonora. 



Geranosipizia caerrdescens livens Bangs and Penard, Proc. Biol. Soc. Washington, 

 xxxiv, 1921, 89 (Alamos, Sonora, nw. Mexico; ori^. descr.; type in Mus. Comp. 

 Zool.). — Bangs, Bull. Mus. Comp. ZooL, Ixx, 1930, 187 (type spec, in Mus. 

 Comp. Zool.; crit.).— Peters, Check-list Birds of World, i, 1931, 268. 



Geranospiza niger livens Swann, Monogr. Birds Prey, i, 1925, 157 (monogr.). 



Geranospiza nigra livens Peters, Check-list Birds of World, i, 1931, 268. — 

 Wetmore, Proc. U. S. Nat. Mus., Ixxxvii, 1939, 186, in text. — van Rossem, 

 Bull. Mus. Comp. ZooL, Ixxvii, 1934, 430 (Alamos); Occ. Pap. Mus. Zool. 

 Louisiana State Univ., No. 21, 1945, 60 (s. Sonora). 



Family PANDIONIDAE: Ospreys 



>Pandiones ("group") Eidgway, Proc. Boston Soc. Nat. Hist., xvi, 1873, 52 

 (includes Elanoides). 



>Pandiones (suborder) Sharpe, Cat. Birds Brit. Mus., i, 1874, xiii, 448 (includes 

 Polioaetvs); Review Rec. Att. Classif. Birds, 1891, 79; Hand-list, i, 1899, 

 xxi, 279 (includes PolioaUus). — Swann, Synopt. List Accip., pt. 4, 1920, 162 

 (includes PoUoaetns). 



■=Pandiones ("group") Ridgway, U. S. Geol. and Geogr. Surv. Terr., Bull. 4, 

 ser. 2, 1875, 4. 



= Pandioninae Sclater and Salvin, Nom. Av. Neotr., 1873, 118. — Barrows, 

 Stand. Nat. Hist., iv, 1884, 273, in text.— Stejneger, Sci. Rec, ii, 1884. — 

 American Ornithologists' Union, Check-list, 1886, 197. — Ridgway, Orn. 

 Illinois, i, 1889, 426, 439.— Knowlton, Birds of World, 1909, 231. 



= Pandionidae Gurney, List Diurn. Birds Prey, 1884, xv, 112. — Coues, Key 

 North Amer. Birds, ed. 2, 1884, 498, 556.— Cope, Amer. Nat., xxiii, 1889, 

 872. — Salvin and Godman, Biol. Centr.-Amer., Aves, iii, 1897, iii, 39. — 

 American Ornithologists' Union, Check-list, ed. 3., 1910, 168. — Dubois, 

 Rev. Frang. Orn., Nos. 49, 50, 1913, (3).— Wetmore, Smiths. Misc. Coll., 

 Ixxxix. No. 13. 1934, 5; xcix, No. 4, 1940, 40; No. 7, 1940, 5. 



'2 Three males, one female. Measurements of one of each sex chiefly ex Bangs 

 and Penard, Proc. Biol. Soc. Washington, xxxiv, 1921, 89. 



