Mr. H. Seebohm on the Ornithology of Siberia. 15 



general colour of the underparts. This was huffish white in 

 the adult birds, and huffish yellow in the young, precisely 

 the difference which I had found only a few weeks before 

 between the adult and young of the very closely allied L. 

 certhiola. None of MiddendorfFs birds, however, were the 

 true L. certhiola of Pallas. The name L. ochotensis, Midd., 

 therefore stands for this species, with L. certhiola, Pall, apud 

 Midd., as a synonym. Besides MiddendorfFs type I found a 

 fine series of skins of this bird collected by Wosnessensky in 

 Kamtchatka and the Kurile Islands. This bird differs from 

 L. certhiola in having the upper parts plain, like L. luscini- 

 oides, instead of spotted, like L. navia. Young birds have, 

 however, traces of obscure spots on the head and back. In 

 this state it was described by Cassin as L.japonica from Japan. 

 The young in first winter plumage was described by Swinhoe 

 as Arundinax blakistoni, from the same locality. One of 

 Wosnessensky's skins from Kamtchatka came into Swinhoe's 

 possession, and was described by him as L. subcerthiola. It 

 is that of an adult bird, and agrees exactly with a skin in my 

 collection collected by Wosnessensky on Urup island, one of 

 the Kurile Islands, between Kamtchatka and Japan. In the 

 British Museum is a skin from Labuan, in Borneo, where this 

 species winters. 



LOCUSTELLA FAscioLATA (Gray). 



Acrocephalusfasciolatus, Gray, P. Z. S. 1860, p. 349. 



Acrocephalus insularis, Wallace, Ibis, 1862, p. 350. 



Calamoherpefumigata, Swinhoe, P. Z. S. 1863, pp. 91, 293. 



Calamoherpe subflavescens, Elliot, P. Z. S. 1870, p. 243. 



It may at first sight appear a somewhat bold step to take 

 to unite two species hitherto considered so distinct as A. fas- 

 ciolatus and A. insularis, and a still bolder one, after having 

 married the two species, to send them to spend their honey- 

 moon in the genus Locustella. The fact is that they agree 

 in every particular, except in the colour of the underparts. 

 The difference of colour, however, is exactly what we have 

 just found to be the difference between young and adult plu- 

 mage in two species of the genus Locustella. I have already 



