VOL. XVIII, PP. 217-218 OCTOBER 17, 1905 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW OWL FROM COSTA RICA. 



BY ANASTASIO ALFARO, 



Director of the Costa Rican National Museum. 



Cryptoglaux ridgwayi sp. nov. 



Type from La Candelaria Mountains, near Escasu, Costa Rica. No. 1 49,709, 

 U. S. National Museum. March 29, 1903. Presented by Anastasio Alfaro. 



Young male. Similar to the corresponding stage of C. acadicus but latero- 

 frontal region and general color of under wing-coverts wood brown instead 

 of white, and without any white on outer surface of wings or on tail, and 

 toes unfeathered (except basal half of the outer). Above plain warm 

 sepia brown, or between sepia and peal brown, inclining on hindneck to 

 Vandyke or mummy brown, the tail darker (between clove brown and 

 seal brown), the remiges grayer brown (between sepia and hair brown), 

 narrowly edged with paler; no trace of white markings on outer surface of 

 wings, except a narrow edging to outermost feather of alula, nor on tail ; 

 but inner webs of innermost secondaries with irregular spots of dull 

 whitish near the margins ; latero-f rental region wood brown ; anterior 

 portion of suborbital region similar but rather paler, deepening on auri 

 cular region into dark brown (rather darker than color of pileum) : bristly 

 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 col 

 ored ; 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 Candelaria, near Escasu). 



I name this small owl in honor of Professor Robert Ridgway, as a 

 "souvenir" of his recent explorations in Costa Rica. 



42 PROC. BIOL. Soc. WASH., VOL. XVIII, 1905. (217) 



