BIRDS OF NORTH AND MIDDLE AMERICA. 85 
Very small Formicariide (length about 120-135 mm.) with long, 
slender bill (longer than head), long, slender tarsi (nearly as long as 
exposed culmen) and with tail four-fifths as long as wing. 
Bill very long (longer than head), straight, and slender, its width 
at frontal antie decidedly greater than its depth at same point and 
equal to about one-fourth the distance from nostril to tip of maxilla; 
culmen sharply ridged, straight, the extreme end abruptly and rather 
strongly decurved, the tip of maxilla very minutely uncinate; maxil- 
lary tomium faintly concave for anterior half or more, very faintly 
(obsoletely) notched subterminally; mandibular tomium straight, 
faintly decurved terminally, without trace of subterminal notch, the 
tip of mandible very slightly decurved; gonys nearly straight, very 
slightly prominent basally. Nostril exposed, widely separated from 
feathering of latero-frontal anti, narrow, longitudinal, overhung 
by a broad, convex operculum. Rictal bristles distinct, but rather 
few and slender; feathers of chin without terminal sete. Wing 
moderate or relatively rather large, with longest primaries extending 
slightly but decidedly beyond secondaries; fifth, sixth, and seventh 
primaries longest, the tenth (outermost) less than half as long as 
longest, the ninth much shorter than secondaries. Tail about four- 
fifths as long as wing, graduated (graduation less than distance from 
nostril to tip of maxilla), the rectrices (10) rather narrow, rounded 
terminally. Tarsus about as long as bill from frontal antie, two- 
fifths as long as wing, slender, the scutella of acrotarsium fairly 
distinct, those of the planta tarsi undivided; middle toe, with claw, 
about two-thirds as long as tarsus; outer toe, without claw, reaching 
to beyond middle of subterminal phalanx of middle toe, the inner toe 
decidedly shorter; hallux about as long as inner toe but much stouter; 
basal phalanx of middle toe wholly united to both outer and inner 
toes, the second phalanx partly united to outer toe; claws moderate 
in size and curvature, that of the hallux shorter than its digit. Plum- 
age full, soft, and blended, that of rump and flanks elongated, more 
lax or fluffy; feathers of pileum not elongated. 
Coloration Above plain brownish (back, etc., sometimes more 
grayish), the tail blackish, with or without whitish tip to rectrices; 
beneath whitish, more or less strongly buffy or rufescent laterally; 
sexes alike. 
Range.—Guatemala to southeastern Brazil. (Four species.) 
RAMPHOCANUS RUFIVENTRIS RUFIVENTRIS (Bonaparte). 
NORTHERN LONG-BILLED ANTWREN. 
Adults (sexes alike) —Pileum and hindneck plain olive-brown (be- 
tween prouts brown and raw umber); rest of upper parts (except 
tail) plain deep grayish olive or olive-slaty, the concealed portion of 
