438 Dr. E. Hartert on Birds from 



conspicuously from the European Clivicola rip aria riparia in 

 being paler above, and having the prcepectoral band paler 

 and less conspicuous. Their wings measure 100 to ]05 mm. 



[The present species was found along the course of the 

 river as far down as Bulun. At Gigalowa, on July 7, the birds 

 were preparing to nest in their old homes, and in a few cases 

 had already laid their eggs, while in others the grasses had 

 been placed on a flooring 18 inches within the tunnel-mouth. 

 The cavities at the ends of the tunnels are broad and fiat ; 

 not rounded, and 4 or 5 inches across on average. One nest 

 contained a dead adult bird, another an egg of last season. 

 The egg is white, ovate, 0"7 in. long, - 5 in. broad. This 

 nesting-site ranged between five and ten feet above the water's 

 edge. A second bank was riddled with holes for a distance 

 of two hundred yards, two to three feet from the top. A 

 third and very high cliff shewed in its centre the nesting- 

 site of a large colony. 



Immediately below Ustkutsk, in the course of a few 

 days' boating, miles of actual nest-line were passed (J2. vi. 

 1903). On calm days the twitterings of the birds during 

 their rather heavy-looking flight almost filled the air. Young 

 just hatched were found in Yakutsk on July 31st.] 



58. MOTACILLA ALBA OCULARIS Swillll. 



Motacilla ocularis Swiuhoe, Ibis, 1860, p. 55 (Amoy). 



2 S ad. Vitim, 16. vi. 1903. (Nos. 73, 83.) 



S ad. Olekminsk, 16. vi. 1903. (No. 100.) 



? ad. Yakutsk, 25. vi. 1903. (No. 140 ) 



£ ad. 100 miles up the river from Bulun, 4. vii. 1903. 

 (No. 184.) 



J 1 ad. A few miles south of the Arctic Circle, 3. vii. 1903. 

 (No. 188.) 



Young birds just out of nests from most of these places 

 and from the mouth of the river. (Nos. 101, 127, 139, 141, 

 252.) 



[This species was found to be common along the river. 

 In Yakutsk (20. vi. 1903) I obtained a young bird essaying an 

 early flight. Twenty miles west of Yakutsk I found a nest 



