THE BIRDS OF MONGOLIA ETC. 165 



In autumn they congregate in small flocks of three to five, and often are seen 

 in company with Titmice. 

 Measurements : — 





Length. 



Width. 



Wing. 



Tail. 



Tarsus. 



(jape. 



<? . 



in. 

 . 4-7 



in. 

 8 



in. 



2-75 



in. 



1-72 



in. 

 0-6 



in. 

 0-72 



.? . 



. 4-5 



7-5 



2-65 



1-54 



0-58 



0-68 



37. SiTTA SINENSIS, J. Vcm Popolsen Utayshey, 



Sitta sinensis, J. Verr. Nouv. Arch, du Museum, 1873, t. ix. pi. iv. 



This and the preceding species have been already observed in China by 

 Pere David. We found it only in the Muni-ul mountains, and then but a 

 single specimen. It measured— length 5", width 9", wing 2"-94, tail l"-8, 

 tarsus 0"-7, gape 0"-73. 



38. Sitta amurensis, Swinh. Popolsen amurshey. 



We met with this species only in the mountains north of Gu-bey-key. 

 In Ussuri country it is extremely common, inhabiting the fir- woods, the thick 

 groves on shores, and islands. In autumn it is frequently seen in company 

 with Parus cyaneus. 



Measurements : — 



Length. Width. Wing. Tail. Tarsus. Gape, 



in. in. in. in. in. in. 



6. Ussuri ... 5-2 ? 3-2 176 0-68 0*8 



S. Gu-bey-key . 47 7 2*92 1-68 0-64 078 



39. Certhia familiaris, L. Pischuha sverchock. 



We met with this species in the Kan-su mountains only, where it is very 



