304 JIR. II, SEEBOIIM ON THE BIRDS OF THE LENA DELTA. 
Larus canus. The Common Gull arrived on June 7th. 
Larus affinis. The Arctic Herring Gull arrived on May 21st- 
Eggs were obtained on June 24th, and young on July 18th’ 
It was last seen on September 26th. 
Larus glaucus. The Glaucous Gull arrived on May 28th. 
A month later eggs were obtained, and the last bird was seen 
on September 2Gth. 
Larus eburneus (?). Two small white Gulls were seen on 
June 3rd, which may have been Ivory Gulls. 
Stercorarius richardsoni and Stercorarius buffoni. Both 
Bichardson’s and Billion’s Skua were first seen on June Gth, 
but only the latter was found breeding. 
CoLTMBUS SEPTENTRiONALis. The Iled-tliroated Diver arrived 
on June 5th. Eggs were obtained on July 11th, but by the 
middle of September the birds disappeared. 
Cygnus mustcus and Cygnus bewicki. Dr. Bunge says that 
the Swans arrived on May 20th, and that he obtained much 
incubated eggs on June 28th. He maintains that intermediate 
forms were very common, and that he saw examples of the Mute 
Swan, but was unable to obtain them. This is extremely 
improbable ; they were doubtless examples of Cygnus americamis. 
Anser segetum. The Bean Goose is the common Goose of the 
south of the delta, but is very rare in the north. 
Anser albifrons. Tlie White-fronted Goose was first seen on 
!May lOtli ; great numbers appeared on 28th; and eggs were 
obtained on Juno 23rd. On July 22nd, a thousand old birds 
in full moult and unable to lly were surrounded and caught by the 
Yakuts. Dr. Bunge says they varied much in size, but in none did 
the white on the forehead extend as far on the crown as it is 
described in the Little White-fronted Goose. 
Anser brenta. The Brent Goose passed through on migration 
from June 7th to the 21th, evidently for the purpose of breeding 
further north. 
Anser glocitans. The Baikal Teal arrived on Juno 18th, in 
Hocks consisting almost entirely of males. Dr. Bunge suggests 
that they had come up north to moult, leaving the females further 
south to perform the duties of incubation. 
Euligula nigra. The Black Scoter was first scen_on Juno 7th, 
but was very rare. 
