624 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



bb. Darker and larger (wing averaging 170 mm. in male, 177.6 in female); legs more 

 buffy, usually more or less mottled (sometimes heavily) with brown; under 

 tail-coverts broadly streaked with brown. (Northern North America.) 



Cryptoglaux tengmalmi richardsoni (p. 624). 

 aa. Smaller (wing less than 160 mm., tail less than 85 mm.); adults with pileum nar- 

 rowly streaked with white,a young with under parts mostly plain ochraceous- 

 buff. 

 b. Toes feathered ; remiges and rectrices spotted with white ; young with forehead 

 white, the suborbital and auri,cular regions uniform sooty black. (Northern 

 North America, south, in high mountains, to Gxiatemala.) 



Cryptoglaux acadica (p. 627). 



bb. Toes naked; remiges and rectrices without white spots; young with forehead 



and suborbital region light buffy brownish, the auricular region darker 



brown. (Costa Rica, in highlands.) Cryptoglaux ridgwayi (p. 633). 



CRYPTOGLAUX TENGMALMI RICHARDSONI (Bonaparte). 



RICHARDSON'S OWL. 



Similar to C. t. tengmalmi ^ but much darker and slightly larger. 



Adults {sexes alilce). — General color of upper parts deep brown 

 (bister to nearly bone brown) ; pileum thickly spotted with wliite, 

 the spots of roundish or guttate form; hindneck with very large, 

 partly concealed, irregularly cordate or variously formed spots of 

 white; scapulars with large, partly concealed, spots of white, the 

 exterior ones with outer webs mostly white, margined terminally 

 with brown; wing-coverts near edge of wing and some of the greater 

 coverts with large roundish spots of white; distal half of seconda- 

 ries crossed by two rows of small white spots (on edge of outer 

 web) ; outer webs of primaries with roundish white spots, these 

 growing smaller on innermost (proximal) quills; tail crossed by four 

 or five transverse rows of more or less distinct white spots, these not 

 touching shaft on either web; face, including "eyebrows" (super- 

 ciliary region) grayish white, the portion immediately above upper 

 eyelid and in front of eye dark sooty brown or blackish, the auricular 

 region more or less intermixed with dusky; supra-auricular border 



Footnote — Continued. 



In Die Vogel der Palaarktischen Fauna, heft viii (bd. ii, 2), 1913, pp. 996-999, not 

 seen until the above matter was put in type. Dr. Hartert divides the Paleearctic 

 birds of this species into five geographic subspecies, as follows: 



(1) Aegolius [oder Cryptoglaux] tengmalmi tengmalmi (p. 996); northern Europe 

 and western Siberia. 



(2) Aegolius [oder Cryptoglaux] tengmalmi caucasicus (p. 998); Caucasus. {Nyctala 

 caucasica Buturlin, Orn. Monatsber., May, 1907, 82.) 



(3) Aegolius [oder Cryptoglaux] tengmalmi sihiricus (p. 998); middle Siberia. 

 (Cryptoglaux sibirica, Buturlin, Nacha Okhota, June, 1910, 78. 



(4) Aegolius [oder Cryptoglaux] tengmalmi jakutorum (p. 999); northeastern Siberia. 

 (Nyctala jakutorum Buturlin, Journ. fiir Orn., 1908, 287.) 



(5) Aegolius [oder Cryptoglaux] tengmalmi magnum (p. 999); Kamchatka and 

 Kolyma District. (Nyctala magna Buturlin, Orn. Monatsber., May, 1907, 80.) 



o Except, perhaps, in C. ridgwayi, the adult of which is unknown. 

 b See page 623. 



