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212 gonys faintly convex basally, straight or faintly concave terminally, the tip of maxilla sometimes slightly decurved. Nostril exposed, posteriorly in contact with loral feathering, rather small, roundish or broadly oval, non-operculate, but margined above by very narrow membranous rim. Rictal bristles wanting, and feathers of chin, etc., without terminal setæ. Wing moderate, much rounded, the longest primaries exceeding secondaries by much less than length of bill from nostril (except in A. leucophthalmus, in which the difference between tip of secondaries and longest primaries nearly equals length of exposed culmen); sixth, seventh, and eighth, sixth and seventh, fifth, sixth, and seventh, or fifth and sixth primaries longest, the tenth (outermost) less than two-thirds to three-fourths (A. leucophthalmus) as long as the longest, the ninth longer than fourth (A. leucophthalmus) to shorter than second (A. rubiginosus). Tail six-sevenths as long as wing (A. leucophthalmus) to as long as wing, graduated (graduation equal to from less than one-fourth, in A. leucophthalmus to more than one- third, in A. veræ pacis, its total length), the rectrices (12) rather broad, with tip rounded or slightly subacuminate. Tarsus shorter than culmen (from base), a little more than one-fourth (in A. leucophthalmus) to nearly one third (in A. veræ pacis) as long as wing, distinctly scutellate; middle toe, with claw, shorter than tarsus; outer toe, without claw, reaching to or slightly beyond middle of subterminal phalanx of middle toe, the inner toe slightly shorter; hallux nearly as long as outer toe, but much stouter; basal phalanx of middle toe united for about half its length to outer toe, for less than half to inner toe; claws moderate to rather large, strongly curved, that of the hallux decidedly shorter than the digit.

Coloration. — Above plain brown (sometimes darker on pileum and hindneck), the upper tail-coverts and tail (sometimes rump also) cinnamon-rufous or chestnut; beneath plain tawny, cinnamon-brown, or pale buffy (more brownish laterally), the throat light russet, tawny, ochraceous, buff, or whitish; foreneck sometimes faintly squamated with brown or dusky; sometimes a tawny or ochraceous supra- auricular stripe. Sexes alike.

Range. — Southern Mexico to British Guiana, Peru, and south- eastern Brazil. (About eighteen species.)