46 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Type locality. — Paracote, 50 feet, eastern shore of Montijo Bay, 1 mile 

 south of the mouth of the Angulo River, Veraguas, Panama. 



Ortalis garrula olivacea Aldrich, Sci. Publ. Cleveland Mus. Nat. Hist., vii, 1937, 53 

 (Paracote, Veraguas, Panama; crit.). — Hellmayr and Conover, Cat. Birds 

 Amer., i, No. 1, 1942, 177 (syn. ; distr.). 



ORTALIS RUFICAUDA (Jardine) 



Rufous-tailed Chachalaca 



Adult (sexes aHke). — Forehead, crown, occiput, nape, suboculars, 

 cheeks, and auriculars dark slate gray, the forehead and crown with a 

 dull brownish wash, the posterior part of the auriculars, the nape, and 

 the throat just posterior to the bare upper throat paling to slate gray; 

 hindneck, sides of neck, interscapulars, scapulars, back, rump, upper 

 wing and tail coverts dark citrine to brownish olive; the greater upper 

 wing coverts with a blue-green sheen on their outer webs ; primaries 

 brownish olive ; outer secondaries brownish olive tinged on the outer 

 web with a blue-green sheen, inner secondaries like the back but with 

 faint transverse striations ; rectrices greenish black with blue-green sheen, 

 the median pair uniformly of this color, the next pair narrowly, the others 

 broadly, tipped with bright chestnut ; lower throat and upper breast grayish 

 dark olive-buff paling on the lower breast, abdomen, sides, flanks, and 

 thighs to grayish buff, tinged on the breast, sides, flanks, and thighs with 

 ochraceous-buft' ; under tail coverts russet ; under wing coverts russet ; 

 bare skin around eye dark blue ; bare sides of throat red ; bill, tarsi, and 

 toes dark blue. 



Juvenal (one unsexed seen, but the sexes probably alike). — Similar 

 to the adult but the feathering of the head and neck browner — dark dra.b 

 to hair brown with an olivaceous wash ; posterior hindneck and inter- 

 scapulars with a dull cinnamon-brown wash ; upperparts blackish olive, 

 the feathers narrowly tipped with dull light buffy olive ; the lower back, 

 rump, and upper tail coverts mixed with brownish olive; remiges as in 

 adult; rectrices as in adult but without the chestnut tips (the only speci- 

 men seen was in very abraded plumage, however) ; underparts as in adult. 



Downy young. — None seen. 



Adult male.—SNxng 222-236 (228) ; tail 264-274 (269.6) ; exposed 

 culmen 24-27.5 (25.9) ; tarsus 64-71.5 (69.1) ; middle toe without claw 

 48-54 (52.2 mm.).''^ 



Adult jenide.—Wmg 208-229 (219.3) ; tail 253-267 (261.6) ; exposed 

 culmen 24-25 (24.3) ; tarsus 64.5-71 (68.8) ; middle toe without claw 

 47-50 (49 mm.). so 



' Five specimens from Tobago and Venezuela. 

 Three specimens from Tobago and Venezuela. 



