STRKJES— STUKIID.K 175 



Bill horn yellow. Iris light yellow. Wing 440-462. Tarsus 

 about 60. Culnien 38-42. Tail 310-330 (H.). 



Residcnl. — N. Norway, Lapland south to about 67 , N. Russia 

 south to about 52", also W. Siberia. Moves south in small 

 numbers in winter as far as Orenburg and E. Prussia. 



The typical form " S. n. nebulosa " is American. 



Strix uralensis iiralensis Pallas. Ural Owl. 



(5 ? General colour white broadly striated with dark brown ; 

 disc grey, ruff mottled brown and white, liill deep yellowish. 

 Iris dark brown. Wing ^ $ 350-395- Tail 280-320 (H.). 



Resident. — Scandinavia (rare in Lapland and Finland), N. 

 Russia south to Volga, Simbirsk, Kazan and Urals (also W. 

 Siberia), Baltic Provinces, E. Prussia, south to Carpathians, 

 Transylvania, and Mountains of Bosnia and Albania. In winter 

 occurs Orenburg ; rare Germany and N. Italy. A melanistic 

 form, very dark brown throughout with black streaks, occurs in 

 E. Alps, Carinthia and Bosnia. 



Strix aluco aluco L. Tawny Owl. Fr, Chat-huant ; 

 Ger. Waldkauz ; Ital. Allocco ; Swed. Kattuggla. 



^ ^ " Grey form." Above white, mottled, freckled, and 

 streaked with dark brown ; outer webs of scapulars and some 

 wing coverts white tinged with rufous ; beneath white, striated 

 and barred with brown ; facial disc grey, ruff mottled brown 

 and white. Bill pale horn, tip yellow. Iris dark brown. Wing 

 ^ 252-290, $ 263-305. Tarsus 42-45. Bill 16-17. A rufous 

 form also occurs, most often in northern countries ; in many 

 the colour is almost chestnut. There is also a melanistic form, 

 as in "uralensis"; this has occurred in Hungary, Turkey, and 

 Caucasus; it has been described as " S. wilkowskii." 



Resident. — British Isles ; Continental Europe (except Lapland 

 and Finland) from 65' in Scandinavia and 61'' in N. Russia south 

 to Mediterranean and Caucasus, east to W. Siberia ; also Asia 

 Minor and Palestine. In winter occurs Morocco ; rare Egypt. 



S. aluco mauritanica (W'ilhcrby). Resembles grey form of 

 "aluco" but darker above and banding more prominent and 

 broader. Wing 273-296 (IL). 



Resident. — N. Morocco, N. Algeria, N. Tunisia. 



