Mr. R. Collett on Phylloscopus borealis. 223 



during the summer I can find scarcely any variation in the 

 coloration of the plumage ; in some males the green colour 

 may be somewhat more strongly developed than in others 

 shot at the same time. 



As previously mentioned, these birds appear to arrive 

 rather late in the spring. Mr. Seebohm, in 1877, met with the 

 first arrivals on June 18th, and a few days afterwards found 

 them in considerable numbers. In 1885, at Matsjok (Tana), 

 they could hardly have arrived before June 22nd, but two or 

 three days afterwards they were numerous. No information 

 can be given concerning their departure. The last specimen 

 shot by me was on July 28th (at the third nest), the day before 

 I left the Tana ; it had already commenced to moult, and had 

 a considerable number of new feathers on its head and back. 



In conclusion I will give the measurements of sixteen 



freshly killed specimens shot by me in Finmark in 1878 and 



1885. -. , 



Males. 



Total 



leugth. Wings. TaU. 



mm. mm. mm. 



a 140 70 49 



h 137 70 61 



c 135 73 53 



d 135 73 52 



e 135 70 49 



/ 135 69 50 



g 133 70 48 



h 132 69 43 



i 132 67 45 



j 131 70 53 



k 130 68 49 



I 129 67 48 



m 127 70 50 



n 127 69. 50 



Females. 



o 125 67 48 



J} 124 65 49 



According to these measurements (together with those 

 previously reported) the average length of this species will 

 be, for males 132 millim., and for females 124 millim. 

 Christiania, January 31, 1886. 



