CONTTÎTBUTrOXS TO THE OTÎNTS OF SACJHALIN. 40 



Chipcsaiii tlioro nro, liowevcr, sli^lit white tips to tlicso primnrie?, 

 but these nve mostly worn ofH'. In the female there is, in addition 

 to this, a. white spot on the inner web near the tip of the first 

 primary of both sides, and on the left side such a spot is present 

 on the outer web as well. Tiiis proves the variability of such 

 markings. 



Recorded by Nikolski after a specimen collected by Pol- 

 JAKOW. To judge from the present collection it is probable 

 that this gull breeds in Saghalin. 



63. Lams canits Linné. 



Month of Susuya River: Id" juv., 2?$ juv., May 19; 

 Icf^ juv., May 20; Iç^ ad.. May 20. 



The adult bird shot on JMay 26th is still in winter plumage. 

 Recorded by Nikolski. 



64. Jjftrus vidihwuJiis Linné. 



Mouth of Susuya River : 1 ? , May 20. 



A young bird still retaining the black band on the tail, 

 and without hood. 



This species was not observed by Nikolski in Sachalin. 



65. Sterna longipennis Nordmann. 



Mouth of Susuya River : lc/^,2??, 4 unsexed specimens. 

 May 19; 3cr^c/',l?. May 20; 5(/c^,4??, ô unsexed 

 specimens. May 22 ; Ic/, June 20. 



