178 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
distinctly operculate. Rictal bristles absent, and feathers of chin, 
etc., without terminal sete. Wing long and pointed, the longer 
primaries exceeding secondaries by much more than length of 
exposed culmen; sixth, seventh, and eighth primaries longest, the 
tenth (outermost) two-thirds to nearly three-fourths as long as the 
longest, the ninth much longer than secondaries. Tail nearly as 
long as wing, graduated for more than one-fourth its length, the 
rectrices (12) abruptly and excessively acuminate terminally, with 
slender tip conspicuously protruded. Tarsus very much longer than 
culmen, at least one-fourth (but less than one-third) as long as wing, 
distinctly scutellate; middle toe, with claw, as long as tarsus; outer 
toe, without claw, reaching to much beyond middle of subterminal 
phalanx of middle toe, the inner toe decidedly shorter; hallux as 
long as outer toe; middle toe united to outer toe by the whole of its 
first and part of its second phalanx, to inner toe for greater part of 
its first phalanx; claws rather large, strongly curved, sharp, that of 
the hallux decidedly shorter than the digit. 
Coloration.—Upper parts (except, sometimes, pileum and hind- 
neck) uniform bright cinnamon-rufous or chestnut-rufous; under 
parts similar but paler, with whitish throat and spots or streaks on 
lower throat or chest, or else under parts of body with conspicuous 
guttate spots of buffy white margined with black. Sexes alike. 
Range.—Costa Rica to Venezuela, Bolivia, and Ecuadér. (Four 
species.”) 
MARGARORNIS RUBIGINOSA Lawrence. 
, COSTA RICAN MARGARORNIS. 
Adults (sexes alike) —Pileum plain chestnut-brown, usually paler 
and more buffy brown on forehead and passing into buffy brown or 
raw-umber on hindneck; rest of upper parts, including wings and 
tail, plain deep cinnamon-rufous or rufous-chestnut, the outer webs 
of two or three outermost primaries and most of inner webs of all the 
remiges (except tertials) deep grayish brown; a superciliary stripe of 
buff, indistinct or obsolete above lores; auricular, suborbital, and 
malar regions plain wood brown or tawny-olive; chin and throat 
dull white or yellowish white; rest of under parts light buffy cinna- 
mon medially deepening into rufous-cinnamon laterally and on under 
tail-coverts, the feathers of median portion of chest (sometimes of 
breast also) with more or less distinct small spots of pale buff, these 
usually margined posteriorly by a very narrow line of black, the 
extreme upper chest with ground color paler, and, together with 
extreme lower throat usually with more or less distinct narrow bars 
of grayish or dusky; under wing-coverts pale buffy, mottled or 
tinged with light cinnamon-brownish, and sometimes more or less 
@ T have not seen M. sqguamigera (D’Orbigny and Lafresnaye), from Bolivia, 
