408 General N. M. Prjevalsky 



tips on the greater and median coverts form two narrow bars 

 on the wing. Under wing-coverts brownish red. 



The female is not distinguishable in plumage from the 

 male. 



This species, named by me after the valued coadjutor and 

 companion of my fourth journey in Central Asia, P. K. 

 Koslow, was first met with in December 1883 on the road 

 from Urga to Ala-shan. We then obtained only one speci- 

 men; but in January 1884 we found this species sufficiently 

 numerous in the Central Ala-shan, in a small but almost 

 barren group of mountains near the wells of Shaughin-dolai ; 

 and we once observed it in the sands of Tyngeri, in Southern 

 Ala-shan. It is generally rare in the Gobi, where it doubt- 

 less only winters. It probably nests in Southern Siberia 

 and in the wooded mountains bordering on the Gobi, such as 

 the Ala-shan and Munni-ula ranges. Its note in \vinter is 

 very like a whistle. We did not find A. kosloivi in any other 

 part of Central Asia except the Gobi ; but a specimen of the 

 same species was sent to the Museum of the Imperial Aca- 

 demy of Sciences by M. Beresowsky, who obtained it in 

 December in the environs of Kobdo^ in South-western 

 Mongolia. 



4. BUDYTES LEUCOCEPHALA^ Sp. U. 



Mas: capite albo : cervice colloque postico cinereo tinctis. 

 Dorso, scapularibus, uropygio, supracaudalibusque fla- 

 vescente- vel virescente-olivaceis ; gula, pectore, abdo- 

 mine, lateribus corporis et subcaudalibus intense flavis. 

 Alis duabus fasciis transversis flavescente-albis ornatis. 

 Duabus rectricibus, utrinque externis, albis, parte infe- 

 riore pogoniorum interuorum nigro marginata. 

 The description is made from two full-grown males ; we 

 aid not obtain a female. 



Of the primaries 1 = 2, the longest ; 3rd is only a little 

 shorter. The bill and feet are black; the eyes dark hazel. 



Male. Forehead, crown, ear-coverts, cheeks, lores, and chin 

 white; back of the head and nape whitish grey (in the 

 younger male they were leaden grey, extending also to the 

 crown) . Throat, breast, abdomen, and flanks, as well as 



