558 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



Sci., ii, 1916, 345 (Orinoco Delta, Venezuela). — Bangs and Pennard, Bull, 

 Mus. Comp. Zool., Ixii, 1918, 37, in text. — Bangs and Noble, Auk, xxxv, 

 1918, 444, in text. — Hellmayr, Nov. Zool., xxviii, 1921, 185. — Swann, 

 S.ynopt. List Accip., pt. 3, 1920, 75; Synop. Accip., pt. 3, 1922, 124 (w. 

 Ecuador; w. Colombia; Panama to s. Nicaragua). — Griscom, Bull. Mus. 

 Comp. Zool., Ixxviii, 1935, 301 (Panama: Pacific slope of Dari6n). — -Aldrich, 

 Sci. Publ. Cleveland Mus. Nat. Hist., vii, 1937, 50, in text. 



Herpetotheres cachinnans maestus Bangs and Noble, Auk, xxxv, 1918, 444 (Bella- 

 vista, nw. Peru; coll. Mus. Comp. Zool.). — Swann, Synop. Accip., pt. 3, 

 1922, 124 (nw. Peru); Monogr. Birds of Prey, ii, 1933, 129 (monogr.). — 

 Peters, Check-list Birds of World, i, 1931, 276. 



Herpetotheres cachinnans chapmani (not Bangs and Pennard) Griscom, Bull. Mus. 

 Comp. Zool., Ixix, 1929, 158 (Cana, Dari^n, Panama; crit.). — Peters, Check- 

 list Birds of World, i, 1931, 276, part (Canal Zone). 



Cachinna cachinnans Fleming, Philos. Zool., ii, 1822, 236. 



Daedalian cachinnans Vigors, Zool. Journ., i, 1824, 338. 



Macagua cachinnans Lesson, Trait6 d'Orn., 1831, 63. — Hellmayr, Nov. Zool., 

 xxviii, 1921, 185. 



Circaetus (Herpetotheres) cachinnans Kaup, Mus. Senckenb., iii, Heft 3, 1845, 

 260, part (South America). 



Circaetus cachinnans Katjp, Isis, 1847, 258 (monogr.), 368, 373, 375, 380; in 

 Jardine's Contr. Orn., 1850, 71. 



Herpetotheres cachicamus (typ. err.) Menegaux, Bull. Mus. Hist. Nat. Paris, 1904, 

 108 (Cayenne). 



Falco sufflator Linnaeus, Syst. Nat., ed. 10, i, 1758, 90 (Surinam; based on 

 Rolander). — Latham, Index Orn., i, 1790, 37. 



Cachinna herpetotheres Gray, Gen. Birds, i, 1844, 15, pi. 7, fig. 4. 



Subfamily Micrasturinae: Forest Falcons 



= Micrastureae Ridgway, Proc. Boston Soc. Nat Hist., xvi, 1873, 51; Orn. Hlinois, 



i, 1889, 427. 

 = Micrastures Ridgway, U. S. Geol. and Geogr. Surv. Terr., ser. 2, Bull. 4, 



June 10, 1875, 4, 5, 6; Bull. 6, 1876, 452. 

 = Micrasturinae Salvin and Godman, Biol. Centr.-Amer., Aves, iii, 1901, 107. — 



Knowlton, Birds of World, 1909, 212, 224 in text. 

 >Herpetotherinae Peters, Check-list Birds of World, i, 1931, 276 (includes 



Herpetotheres and Micrastur) , 



Slender hawldike Falcones with short, rounded, concave wings, 

 relatively long, much rounded or graduated tail (nearly equal to, some- 

 times longer than, wing), long, slender tarsus and middle toe, as in the 

 Buteonine genus Accipiier, but with the orbital region bare, the 

 auricular region margined posteriorly by a line of small, firm, im- 

 bricated or squamated feathers, forming a sort of "facial ruff," as in 

 the buteonine genus Circus and in Striges, and scutellation of tarsi 

 very different. 



Nostril a relatively large roundish, broadly oval or subpyriform 

 opening, without bony rim or obvious central tubercle; orbital region 

 bare. Wing short and rounded, very concave beneath, the primaries 

 bowed, the outermost primary shorter than the innermost, the third 



