634 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



feathers of loral region blackish; throat deep brown, like 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, light colored; claws dark horn color; length (skin), 

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

 13; tarsus, 25; middle toe, 20. 



High mountains of Costa Kica (Cerro de la Candelaria, near 

 Escasti). 



Cryptoglaux ridgwayi Alfaeo, Proc. Biol. Soc. Wash., xviii, Oct. 17, 1905, 217 



(Cerro de la Candelaria, near Escasii, Costa Eica; coll. U. S. Nat. Mus.). 

 01auxridgwayiCAB.B.iKEn, Ann. Carnegie Mus., vi, 1910, 479. 



Genus SCOTIAPTEX Swainson. 



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

 cinerea Ginelin=jS'. nebulosa Forster.) 



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

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

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

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

 like feathers nearly concealing the claws. 



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

 cuhnen, ascending and slightly arched basally. Nostril rather large, 

 nearly circular or longitudinally broadly oval, opening in anterior edge 

 of cere. Ear-conch more than half 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 primaries 

 exceeding 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 all 

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



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

 B Seventh from outside. 



