*74 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Morococcyx erythropygia (not Coecyzus erythropyga Lesson) Lawrence, Mem. Bost. 



Soc. N. H., ii, 1874, 293 (Mazatlan, Sinaloa); Bull. U. S. Nat. Mus., no. 4, 1876, 



34 (Chihuitan and Tehuantepec City, Oaxaca).— Sclater and Salvin, Proc. 



Zool. Soc. Lond., 1870, 551 (San Juan del Rio, Oaxaca; Mazatlan).— Miller 



(W. DeW.), Bull. Am. Mus. N. H., xxi, 1905, 350 (Escuinapa, s. Sinaloa). 

 [Morococcyx] erythropygia Sclater and Salvin, Nom. Av. Neotr., 1873, 108, part. 

 Morococcyx erythropygus Shelley, Cat. Birds Brit. Mus., xix, 1891, 422, part (San 



Bias, Tepic; Plains of Colima; Acapulco and Dos Arroyos, Guerrero; Sierra 



Santa Domingo and Chimalapa, Oaxaca).— Salvin and Godman, Biol. 



Centr. Am., Aves, ii, 1896, 538, part ( San Juan del Rio, etc., Guerrero; Santa 



Eflgenia, JucMtan, etc., Oaxaca; Tonala, Chiapas). 

 [Morococcyx] erythropygus Heine and Reichenow, Nom. Mus; Hein. Orn., 1890, 



202 (Tehuantepec).— Sharpb, Hand-list, ii, 1900, 174, part. 

 Morococcyx erythropygus mexicanus Ridgwat, Proc. Biol. Soc. Wash., xxviii, 



May 27, 1915, 105 (Juchitan, Oaxaca, s. w. Mexico; coll. U. S. Nat. Mus.). 



Genus GEOCOCCYX Wagler. 



Geococcyx Wagler, Isis, 1831, 524. (Type, O. variegata V?a,glei=Saurothera cali- 



forniana Lesson.) 

 Leptostoma Swainson, Classif. Birds, ii, 1837, 325. (Type, L. longicauda Swain- 



Bon=Saurothera californiana Lesson.) 



Large, long-tailed, long-billed, terrestrial Cuculinae (length about 

 385-583 mm.) with culm en (from base) as long as tarsus, pileum 

 crested, and plumage conspicuously streaked. 



Bill about as long as bead, narrow, moderately compressed ter- 

 minally, slightly widened basally, its depth at anterior end of 

 nostrils slightly greater than its width at same point; exposed 

 culmen decidedly shorter than tarsus, nearly straight for basal 

 half (more or less), then more and more decurved terminally, 

 the tip of the maxilla distinctly uncinate, the culmen rounded (in 

 transverse section), more broadly so basally; gonys about as long 

 as mandibular rami or slightly shorter, faintly concave, slightly 

 prominent basally, rounded; maxillary tomium nearly straight for 

 most of its length but abruptly decurved terminally, not distinctly if 

 at all deflected basally. Nostril longitudinal, elliptical, in lower 

 anterior portion of nasal fossa. Wing rather short, much rounded, the 

 longest primaries exceeding distal secondaries by about length of 

 hallux without claw; fourth, fifth, and sixth primaries longest, the 

 third and seventh, successively, slightly shorter, the ninth shorter 

 than first, the tenth (outermost) more than half as long as the longest. 

 Tail more than one and a half times as long as wing, graduated for 

 nearly one-third its length, the rectrices rather narrow, tapering 

 terminally. Tarsus about one and a half times as long as middle toe 

 with claw, equal to length of culmen from base, more than one-third 

 as long as wing, stout. 



Plumage and coloration. — Plumage in general soft, the feathers 

 distinctly outlined, with edges loosely webbed or semi-decomposed, 



