100 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



birds). — Stresemann, Arch, fur Naturg., n. f., ix, 1940, 144, in text (feeds 

 on wasps). — Griscom and Greenway, Bull. Mus. Comp. Zool., Ixxxviii, 

 1941, 110 (Lower Amazonia; Rio Tapaj6z, Pinhay, and Tauary; spec). — 

 DEL Campo, Anales Inst. Biol., xiii, 1942, 701 (Chiapas; spec). 



Odontriorchis palliatus mexicanus Swann, Synop. Accip., pt. 3, 1922, 159 (Tampico, 

 Tamaulipas; coll. Brit. Mus.); Monogr. Birds Prey, pt. 13, 1935, 258. — 

 Brodkorb, Misc. Publ. Mus. Zool. Univ. Michigan, No. 56, 1943, 26 (Mexico; 

 Tabasco, 15 km. n. of Reforma; crit.; meas.). 



Odontriorchis palliatus guianensis Swann, Synop. Accip., pt. 3, 1922, 159 (Para- 

 maribo, Surinam; coll. Tring Mus.) ; Monogr. Birds Prey, pt. 13, 1935, 257. — 

 Pinto, Rev. Mus. Paulista, xxii, 1938, 62 (distr.). 



Odontriorchis palliatus palliatus Swann, Synop. Accip., 1922, 158; Monogr. Birds 

 Prey, pt. 12, 1934, 256.— Hellmayr, Publ. Field Mus. Nat. Hist., zool. ser., 

 xii, 1929, 456 (Piauhy, Brazil; crit.). — Naumburg, Bull. Amer. Mus. Nat. 

 Hist., Ix, 1930, 112 (distr.; Matto Grosso, Brazil).— [Anonymous], El Hor- 

 nero, vi, 1935, 183 (distr.). — Steullet and Deautier, Obra Cincuentenario 

 Mus. La Plata, i, 1936, 394 (syn.; Argentine records; distr.).— Pinto, Rev. 

 Mus. Paulista, xxii, 1938, 62 (distr.) ; xxiv, 1940, 229, in te.xt (Pernambuco) ; 

 XXV, 1942, 12 (Matto Grosso, Santo Antonio; spec). 



? Odontriorchis forbesi Swann, Synop. Accip., ed. 2, 1922, 159 (Pernambuco, 

 Brazil; descr.).— Pinto, Rev. Mus. Paulista, xxii, 1938, 63 (distr.); xxiv, 

 1940, 229 (Pernambuco). 



Cymindis buteonides Lesson, Traits d'Orn., 1830, 55 (new name for Falco palliatus 

 Temminck; Brazil and Guiana). 



Micraetus holmbergiamis Bertoni, Aves Nuevas Paraguay, 1901, 156 (see Ihering, 

 Rev. Mus. Paulista, vi, 1904, 339). 



Genus CHONDROHIERAX Lesson 



Chondrohierax Lesson, Echo du Monde Savant, s6r. 2, vii, 1843, 61. (Type, 

 by monotypy, Daedalion erythrofrons Lesson = Fa?co iincinatus Temminck.) 



Regerhinus Kaup, Mus. Senckenb., iii. Heft 3, 1845, 255, 262. (New name for 

 Cymindis Latreille, but on p. 262 has as type, by monotypy, Falco uncinatus 

 "Ill[iger]"; also in Jardine's Contr. Orn., 1850, 77.) 



Regerrhinus (emendation) Saunders, Zool. Rec, xvii, 1881, Aves, 10, 43. 



Medium-sized Perninae (wing about 246-324 mm.) with tumid cere, 

 oblique, slitlike nostrils, slightly rounded tail, naked lores, and with the 

 bill relatively very large, conspicuously hooked and compressed, the 

 tomia without "teeth" or identations. 



Bill relatively very large, much compressed, and conspicuously 

 hooked; culmen nearly (sometimes quite) as long as tarsus, in one 

 species longer, forming a curve of one-fourth to nearly one-half the 

 circumference of a circle, strongly and regularly decurved, the tip of 

 maxilla produced into a very long unguis; depth of bill at anterior 

 margin of cere equal to about twice its width at same point and to less 

 than half the length (curve) of culmen; maxillary tomium nearly 

 straight posterior to base of unguis, without distinct, if any, sinuations 

 or irregularities of outhne; mandibular tomium arched posterior to 

 middle portion, the tip of mandible obliquely truncate; gonys nearly 

 straight, less than one-third as long as culmen; cere relatively very 



