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northern B. bubo bubo, except that the black stripes on the chest are very wide. 

 It is also rather larger than other Spanish skins, the wing measuring nearly 47 cm. 



Bubo bubo interpositus subspec. nov. 



This form is intermediate between B. bubo bubo and B. bubo turcomana, but 

 nearest to the latter. It differs, however, from B. b. turcomana in having wider 

 shaft-stripes to the feathers of the abdomen, a darker brown ground-colonr on 

 the feathers of the hind-neck and upper back, and, usually, more black on the 

 scapulars, lower back, and upper tail-coverts. The underside of the quills is also 

 darker than in B. b. turcomana, while in B. b. bubo it is often still darker. 



B. b. interpositus is lighter above and below than any specimens of B. bubo 

 bubo, and not so blackish above as the Spanish form (/>. b. Itispanm). 



In size this new form does nut differ from B. bubo bubo. 



Type : o ad., 15. iii. 1909, Eregli, north of the Cilician Taurus, in Asia Minor, 

 collected by Mr. C. Hilgert's collector. 



Besides the specimens from Eregli, those from the Caucasus (Wladikawkas), 

 and from the Lower Wolga (Sarepta), belong to this form. It is jiossible that 

 other forms — viz. B. b. sibiricus and B. b. turcomana — visit the Lower Wolga in 

 winter; but four specimens which we were able to examine are indistinguishable 

 from the type of B. b. interpositus, and not like any of the other forms. 



We have examined five skins from Eregli — four in the Tring Museum and 

 one in Professor Koenig's collection ; two from Wladikawkas, Northern Caucasus ; 

 and four from Sarepta. 



Bubo bubo turcomana Eversm. 



Strix turcomana Eversmann, Addenda ad PaUtisii Zooyraph. Roxso-Asiat. i. p. 3 (1835— Between 

 the Caspian and Aral Seas). 



This race is much lighter than B. b. bubo and B. b. Iiispanus, and also 

 distinctly lighter, more yellowish and more sandy, than B. b. interpositus. 

 Especially the ground-colour of the occiput, hind-neck and upper back is lighter, 

 also the under surface of the quills. Generally B. b. turcomana is also smaller 

 and slenderer than B. b. bubo, but some specimens are apparently as big as any 

 northern Eagle-Owl. Single specimens are sometimes hardly distinguishable from 

 B. b. interpositus, but as a rule they are very well separable. 



We have before us twenty-two .sjiecimcns belonging to B. b. turcomana. They 

 are from Transcaspia, llussian Turkestan (Issik Kui, Tian Shan, Aksu, Djarkend, 

 Karakol, MargeJan, Merw), Kerat in East Persia, Persian Baluchistan, and one 

 from Blagoslovenka, near Orenburg, in the Southern Ural. The latter was obtained 

 on December 5, 1888, by N. Zarudny, and marked as Bubo iynavus (= B. b. bubo). 

 It is absolutely like Transcaspian and Turkestan examples, and neither to be 

 confounded with B. b. bubo nor with D. b. sibiricus. The latter, however, appears 

 to be found in winter near Orenburg as well. 



We are not acquainted with 



Bubo b'lbo ni/wls/ni Zarudny. 

 The author described (Orn. Jahrb. 1905. p. 142) this form as being closely allied 

 to B. b. turcomana, but smaller, and having a smaller area on the chest covered 

 with bold markings, which merge almost without transition into the very narrow 

 shaft-lines on the lower breast, while the markings on the abdomen are finer 

 and the upperside is more rusty. Mr. Zarudny had a pair from Arabistau 

 (Chusistan) in West Persia. 



