472 Annals of the Carnegie Museum. 



Subfamily Pandionin^e. 

 167. Pandion haliaetus carolinensis (Gmelin). 



Falco carolinensis Gmelin, Syst. Nat., i, i, 1 788, 263. 



Pandion haliaetus Sharpe, Cat. Birds Brit. Mus., I, 1874, 449. — Salvin and 

 Godman, Biol. Centr.-Am., Aves, III, 1901, 39 (no C. R. record). 



Pandion haliaetus carolinensis RiDGWAY, Proc. Acad. Nat. Sci. Phila. , 1870, 143. 

 (crit. ). — Bangs, Auk, XXIV, 1907, 290 (Barranca de Puntarenas [Under- 

 wood], Aug. 12, 1906). 



The specimen recorded by Mr. Bangs seems to be the first published 

 record for Costa Rica and the only one. I took the bird at Guacimo 

 in December, 1903, but the specimen was not preserved. I presume 

 it is a rare resident of the lowlands along both oceans. 



Families ALUCONID^E and STRIGID^E. 



Key to the Costa Rican Species. 



a. Size small (wing not more than 150 mm.), usually less. 

 b. Without ear-tufts. 



c. Toes feathered ; breast and abdomen plain buff-ochraceous. 



Glaux ridgwayi. 



cc. Toes with only a few bristles ; lower parts streaked or brokenly barred. 



d. Pileum and nape nearly concolorous with back, with paler streaks. 



Glaucidium phalcenoides ridgwayi. 

 dd. Pileum and nape grayer than back, thickly covered with small 

 whitish spots. 

 e. Pileum decidedly gray ; side and flanks streaked but not 

 barred ; tail with three small white spots on each feather. 



Glaucidium griseiceps. 



ee. Pileum brown, sides of breast, sides, and flanks, brokenly 



barred ; tail with four white bars (broken medially) and 



white tips. Glaucidium jardinii. 



bb. With distinct ear-tufts. 



c. Tarsi nearly bare of feathers. Olus nudipes* 



cc. Tarsi feathered to base of toes. 



d. Toes with bristly feathers scattered over upper surface. 



Olus cooperi* 

 dd. Toes bare. 



e. Under surface of body finely and confusedly vermiculated, 

 without distinct dark shaft-streaks. Otus vermiculatus. 



ee. Under surface light-colored, with sharp sooty-brown shaft- 

 streaks, crossed with several wavy dark lines. 



Otus choliba choliba* 

 aa. Size larger (wing not less than 230 mm.). 

 b. Without distinct ear-tufts. 



