observed on the Yenisei River. 497 



collybita, but has no yelluw cither on tlie rump or the edge 

 and underpart of tiie wingj which has uo trace of bars^ and 

 the formula is the same as in Ph. collybita. Culmen 0*5 in., 

 wing 2'42, tail 2*0, tarsus 07o." The song was not a 

 Chiffchaff's, but more like a Willow-Warbler's, and the bird 

 had pale greyish legs. 



18. ^Phylloscopus thistis, 



Siberian Chiffchaffs were among the earliest of the small 

 birds to arrive at Yeniseisk, and my first specimen was 

 shot on May 15th. They were common all the way down 

 the river nearly up to lat. 70° N,, frequenting the low bushes 

 growing on the islands and banks of the river after the 

 forest had been left behind. My first two nests were found 

 on June 20th, and both were made in a bunch of dead grass 

 left on the boughs by the floods when the river had overflowed, 

 at the breaking up of the ice. My other three nests were 

 almost on the ground among the willows, and plentifully 

 lined with brown and white feathers of the Willow-Grouse. 

 These three nests had, in each of them, three eggs, which 

 are white (pink before blown) with small dark brown spots 

 at the larger end ; but the first two nests had n(>t yet eggs 

 in them. 



19. *Phylloscopus trochilus. 



Willow- Warblers also had arrived at Yeniseisk on May 

 15th, and soon became common, but did not subsequently 

 appear to be quite so numerous as the following species. 

 One specimen shot at Yeniseisk has been pronounced by 

 Mr. Dresser to be Ph. trochilus var. gaetkii; it is smaller 

 than the ordinary Willow-Warbler. Both Ph. trochilus and 

 Ph. burealis were met with as far as lat. 69'"' 40' N. 



20. *Phylloscopus bokealis. 



This Warbler, though not observed at Yeniseisk, w^as first 

 obtained in lat. 61° N., and afterwards seen and heard at 

 many places. No nests were found, notwithstanding a careful 

 search. 



SER. VII. VOL. IV. 2 m 



