110 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult female. — Pileum and hindneck plain brownish gray or gray- 

 ish brown; back and scapulars deep yellowish olive, the feathers indis- 

 tinctly darker centrally; lower back, rump, and upper tail-coverts 

 lighter, more yellowish olive, inclining to dull gallstone yellow; wings 

 and tail dusky with yellowish-olive edgings; sides of head and neck 

 similar to pileum and hindneck, but paler and rather browner, the 

 chin and throat still paler (very nearly hair brown) ; under parts light 

 yellowish olive, brightest on chest, ^ duller on abdomen, where some- 

 times inclining to hair brown; bill, iris, and feet as in adult male; 

 length (skins), 164.9-172.7 (160.3); wing, Y2.1-78.7 (7-1.7); taU, 66.8- 

 73.4 (69.6); exposed cuhnen, 12.7-15.2 (13.7); depth of bill at base, 

 7.6-8.1 (7.9); tarsus, 21.6-22.9 (22.6); middle toe, 13.7-16 (14.7).' 



Young male {first year). — Exactly like the adult female. 



Immature males variously intermediate in coloration between the 

 adult male and female, according to age.^ 



State of Tabasco (Teapa), southeastern Mexico, eastern Guatemala 

 (Yzabal, Tucuru, Cahabon, etc.), and southward to Isthmus of Panama. 



Ramphocelus passerinii Bonaparte, Antologia, 1831, no. 130, p. 3 (Mexico or 

 Cuba); Ms, 1833, 755 ("Cuba"); Consp. Av., i, 1850, 242 ("Bolivia").— Les- 

 son, Rev. Zool., 1840, 133, excl. syn. — Sclater, Proc. Zool. Soc. Lond., 

 1856, 130 (monogr.; "Columbia River, Oregon"; "Mexico"; Guatemala; 

 Nicaragua) , 142 (Chiriqui); 1859,59 (Omoa, Honduras) ; Synop. Av. Tanagr., 

 1856, 54; Cat. Am. Birds, 1862, 79 (Nicaragua; Honduraa). — Moore, Proc. 

 Zool. Soc. Lond., 1859, 59 (Omoa, Honduras).— Salvin, Ibis, 1859, 467 

 (Yzabal, Guatemala); 1870, 187 (Bugaba, Chiriqui; Mina de Chorcha, Ver- 

 agua) ; 1872, 316 (Chontales, Nicaragua). — Sclater and Salvin, Ibis, 1859, 5, 

 16 (Yzabal, Atlantic coast, and Cahabon, Vera Paz, Guatemala); Proc. Zool. 

 Soc. Lond., 1867, 278 (Mosquito coast, Nicaragua); 1870, 836 (San Pedro, 



^ The chest and upper tail-coverts sometimes more or less tinged with orange. 



^ Twelve specimens. 



Average measurements of specimens from different localities are as follows: 



Locality. 



Middle 

 toe. 



MALES. 



Five adult males from Guatemala 



Five adult males from Honduras 



Four adult males from Nicaragua 



Four adult males from Costa Kica 



One adult male from Veragua 



Five adult males from Isthmus of Panama 



FEMALES. 



Four adult females from Guatemala 



Three adult females from Honduras 



Two adult females from Nicaragua 



Two adult females from Costa Rica 



One adult female from Panama 



15 



16 



14.6 



15.7 



16.3 



15.2 



15 



14.5 



14.7 



15.7 



16 



' The male requires several years to attain the perfect adult plumage, and breeds in 

 the plumage indistinguishable from that of the adult female. 



