178 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



distinctly operculate. Rictal bristles absent, and feathers of chin, 

 etc., without terminal setae. Wmg 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 subtermmal 

 phalanx of middle toe, the mner 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 mner 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 mth black. Sexes alike. 



Range. — Costa Rica to Venezuela, Bolivia, and Ecuador. (Four 

 species.®) 



MARGARORNIS RUBIGINOSA Lawrence. 



COSTA RICAN MARGARORNIS. 



Adults {sexes alike). — Pileum plam chestnut-browTi, usually paler 

 and more buffy brown on forehead and passing mto 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 supercihary 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 hght buffy cinna- 

 mon medially deepenmg into rufous-cinnamon laterally and on under 

 tail-coverts, the feathers of median portion of chest (sometimes of 

 breast also) \^'ith 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 bulfy, mottled or 

 tinged with Ught cinnamon-brownish, and sometimes more or less 



o I have not seen M. squamigera (D'Orbigny and Lafresnaye), from Bolivia, 



