192 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



depth of bill at base, 12.2-15.2 (13); tarsus, 30.2-34.8 (31.5); middle 

 toe, 19.8-24.1 (21.6).' 



Western Mexico, north to State of Sinaloa (Mazatlan, Rosario, etc.), 

 south through territory of Tepic and States of Jalisco, Colima, Guer- 

 rero, and Oaxaca (Barrio, Chihuitan, Tehuantepec City, etc.) to Chiapas 

 (Tonala). 



Icterus melamderus Bonaparte, Journ. Ac. Nat. Sci. Phila., iv, 1825, 389 (Mex- 

 ico). 

 Ciaciais} melaniderus Gray, Gen. Birds, ii, 1849, 342. 

 [Cassiculus] melaniclems Bonaparte, Consp. Av., i, 1850, 428.— Sclater and Sal- 



viN, Nom. Av. Neotr., 1873, 35. 

 Ciagsiculu/:] melamcterus Cabanib, Mus. Hein., i, 1851, 186. 

 Casdculus inelnnicterusScLATEJi, Proe. Zool. Soc. Lond., 1859, 380 (Rio Grande, 

 Oaxaca); Cat. Am. Birds, 1862, 129 (Oaxaca); Ibis, 188.3, 156 (monogr.); 

 Cat. Birds Brit. Mus., xi, 1886, 328 (Tonala, Chiapas; Acapulco, Guerrero; 

 Presidio and Mazatlan, Sinaloa) .— Duqes, La Naturaleza, i, 1869, 139 (Guer- 

 rero, Mexico).— FiNScn, Abh. Nat. Yer. Brem., 1870, 263 (Mazatlan).— 

 Lawrence, Mem. Boat. Soc. N. H., ii, 1874, 278 (Mazatlan; Tepic; Colima; 

 Rio de Coahuyana; habits; descr. nest and eggs).- Lawrence, Bull. U. S. 

 Nat. Mus., no. 4, 1876, 23 (Barrio, Chihuitan, and Tehuantepec City, Oax- 

 aca).— Salvin and Goilman, Biol. Centr.-Am., Aves, i, 1883, 443.— Ferrari- 

 Perez, Proc. U. S. Nat. Mus., ix, 1886, 149 (Yanhuitlan?, Oaxaca). 

 Cmdciis melaniderns Cassin, Proc. Ac. Nat. Sci. Phila., 1867, 66 (monogr.; Mazat- 

 lan; Acapulco). 

 Pslarocolius'] mdanicterus Waglee, Isis, 1829, 752 (Mexico). 

 Icterus diadematus Temminck, PI. Col., 1829, pi. 482 and text ( Mexico ;=female). 

 Cassiculus coronatus Swainson, Philos. Mag, new ser., i, 1827, 436 (Temascaltepec, 



Mexico); Zool. Journ., iii, 1827, 353. 

 Xanthomus coronatus Jakdine and Selby, Illustr. Orh., 1828, pi. 45 (Mexico). 



Genus AMBLYCERCUS Cataanis. 



AmblycercHs ' Cabanis, Mus. Hein., i, Sept., 1851, 190. (Type, Cassicus niger- 

 rimus Spix, = C. soHtarius Yieillot.) 



Medium-sized or rather small uniformly black Icteridae with short 

 and excessively rounded wing (outermost primary shorter than inner- 

 most) and tip of the wedge-shaped, light-colored bill broad "and con- 

 spicuously flattened. 



Bill about as long as head or a little shorter, cuneate-conical, com- 

 pressed, with tip broad and truncate in vertical but acute in lateral 

 profile, its basal depth a little less than half the culmen, its basal width 

 a little less than half the distance from nostril to tip of maxilla; cul- 

 men straight, broad, and flattened, with parallel edges of flattened 

 surface not ridged, the base not elevated; commissure straight to 

 beneath nostril, where gradually deflexed to the rictus. Nostril below 

 lateral median line of maxilla, small, narrowly oval or slit-like, 



' Five specimens, 



• inve specimens. 



^ " a/j-fiXvi, stumph, u. KepKoi, Schwanz. 



