NO. 2 BIRDS OF ALASKA AND SIBERIA HERSEY II 



spring migration, but I did not note their presence there during the 

 breeding season. The other two species were common. From Cape 

 Espenberg to Barrow they were met with rather frequently, although 

 usually not more than one was seen at a time, and they were never 

 as common as the Parasitic and Long-tailed. 



STERCORARIUS PARASITICUS 



Parasitic Jaeger 



This is the most evenly distributed and probably the most abun- 

 dant Jaeger in Alaska, although exceeded in numbers in one or two 

 localities by the Long-tailed. They were found nearly everywhere 

 that stops were made from the Yukon Delta to Barrow. Among the 

 large number seen during the summer, only two were in the dark 

 phase of plumage, one of which was secured. 



The dusky patches on the sides of the breast, when viewed from 

 a distance, give this bird the appearance of having a broad black 

 band across the breast. This is an excellent field mark and readily 

 distinguishes this species from the Long-tailed Jaeger when flying 

 toward one or otherwise in a position where the tail feathers are 

 hidden from sight. 



STERCORARIUS LONGICAUDUS 



Long-tailed Jaeger 



This graceful bird was found commonly between Golovin Bay and 

 the mouth of the Yukon River. About St. Michael it was very 

 numerous. As we worked northward it was rarely seen, until near 

 Point Barrow it again appeared in numbers. 



This species showed less variations in plumage than the Parasitic. 

 The specimens taken and the birds observed were quite uniform in 

 color, although the length of the central tail feathers varied m.uch 

 in different birds. 



RISSA TRIDACTYLA POLLICARIS 



Pacific Kittiwake 



Very common ofif shore throughout the region. They did not 

 usually come very near the land except where breeding and they were 

 not seen at the Yukon, where the water is very shallow for long 

 distances ofif shore. An exception was noted at Nome where they 

 were frequently seen flying about the beach. 



They nest at East Cape, Puffin Island, and many other places. 

 On August 2 most of the nests on Puffin Island held young birds 



