634 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



feathers of loral region blackisli; throat deep brown, Uke pileum, with 

 a band of dull buffy whitish immediately below; rest of underparts 

 plain cinnamon-buff or clay color, deeper anteriorly, where passing into 

 russet on sides of breast, decidedly paler on legs and under tail-coverts; 

 under wing-coverts wood brown, tinged with deeper brown, especially 

 on under primary coverts; under surface of remiges plain deep hair 

 brown, the innermost secondaries with irregular dull whitish spots 

 toward edge of inner web; bill blackish; toes (except basal half of 

 the outer) naked, Ught colored; claws dark horn color; length (skin), 

 185; wing, 143; tail, 64; culmen (from anterior edge of cere), 

 13; tarsus, 25; middle toe, 20. 



High mountains of Costa Rica (Cerro de la Candel^ria, near 

 Escasu) . 



Cryptoglaux ridgivayi Alfaro, Proc. Biol. Soc. Wasli., xviii, Oct. 17, 1905, 217 



(Cerro de la Candelaria, near Escasu, Costa Rica; coll. U. S. Nat. Mue.). 

 Glaux ridgwayi Carriker, Aim. Carnegie Mus., vi, 1910, ^79. 



Genus SCOTIAPTEX Swainson. 



Scotiaptex Swainson, Classif. Birds, i, 1836, 327; ii, 1837, 217. (Type, Strix 

 cinerea Gmelin=-S'. nebulosa Forster.) 



Very large Bubonidse (wing about 405-460 mm.) without ear-tufts, 

 relatively small eyes, bill, and feet, enormous, conspicuously asym- 

 metrical and broadly operculate ear-conchs, bill nearly hidden by 

 long, antrorse loral feathers, and toes densely covered by long, hair- 

 like feathers nearly concealing the claws. 



Bill relatively small; top of cere more than two- thirds as long as 

 culmen, ascendmg and slightly arched basally. Nostril rather large, 

 nearly circular or longitudinally broadly oval, opening in anterior edge 

 of cere. Ear-conch more than hah as long (vertically) as greatest 

 depth of head, reniform, the anterior side provided with a large and 

 broad operculum or dermal flap, elsewhere margined with a narrow 

 free dermal rim; ear-orifice opening below the median transverse 

 "bridge;" ears slightly asymmetrical, that on left side considerably 

 broader than that on right. Wing very large, with longest prunaries 

 exceedmg distal secondaries by less than one-third the total length 

 of wing; sixth and seventh, or sixth, seventh, and eighth,'^ primaries 

 longest, the tenth (apparent outermost) shorter than fourth;'' four 

 outer primaries with inner webs emarginated or sinuated (one or 

 two additional ones sometimes showing an appreciable sinuation). 

 Tail nearly three-fourths as long as wing, strongly rounded. Tarsus 

 equal to or longer than middle toe with claw, densely covered aU 

 round with long, soft, hair-Uke feathers, the toes (except terminal 



a Fourth and fifth, or third, fourth, and fifth, from outside. 

 ^ Seventh from outside. 



