Birds of Celebes: Sylviidae. 
527 
of the two forms should he made before their distinction as species is admitted. 
Cabanis (1) held them to he identical. Taczanowski (b 2) has recently- 
separated a third form, L.pleskei from Corea, which is said to difter from 
L. ochotensis in being larger, having a much longer bill, a longer tail, and the 
feathers of the back and head uniform without a trace of a darker centre. 
What this bird is we do not know, but it is of course a migrant occurring in 
southern localities in winter. 
GENUS PHIYLLOSCOPUS Boie. 
The Willow-warblers are generally smaller than the Reed-warblers, have the 
tail of 12 feathers square, the tarsus not scutellated, the feathers of the fore- 
head at the base of the bill, as is shown by Oates, disintegrated and velvety, 
with a few hairs directed forwards. The bill is slightly notched, somewhat weaker 
and flatter than in Acrocephahis, the culmen about as long as the cranium. The 
first primary is minute, the second very long, the third and fourth longest. 
The nest is domed, placed on or near the ground; the eggs white, prettily 
spotted. 
A Palaearctic genus, migrating sonth in winter. 
218. PHYLLOSCOPUS BOREALIS (Bias.). 
Arctic Willow-warbler. 
a. Phyllopneuste javaniea (1) Bp. (nec Horsf.), Ooiisp. 1850, I, 290, (2) fealvad., Gat. 
Ucc. Borneo 1874, 244. 
b. Sylvia (Phyllopneuste) eversmanni (I) Midd. (nec Bp.), Sib. Reise, Vbg. 1853, 1/8, t. XVI, 
f. 1, 2, 3 A. 
c. Phyllopneuste horealis (1) J. H. Bias., Xauinannia 1858, 313; (II'j id., in Naum. Vog. 
Deutschl. Xni, 69, t. 375, f. J; (3) id.. Ibis 1859, 459; 1862, 68—70; (4) Swinli., 
P. Z. S. 1871, 356; (5) Tristr., Ibis 1871, 231; (6) Tacz., J. f. 0. 1872, 358; 
(7) id., ib. 1874, 328, 335; (8) Wald., Ibis 1874, 140; (9) Swinli., t. c. 440; (10) 
Brooks, t. c. 459; (11) Tacz., J. f. 0. 1875, 245; (12) Meves, t. c. 429; (13) David 
& Oust, Ois. Chine 1877, 271; (14) Pryer, Rowley’s Orn. Misc. 1877, 11, 171; 
(15) Tacz., P. Z. S. 1887, 602; (16) id., ib. 1888, 463; (17) id., Paune Orn. Sib. 
Orient 1891, I, 254. 
d. Phylloscopus sylvicultrix (1) S-winli., Ibis 1860, 53. 
e. Sylvia flavescens (1) Glray, P. Z. S. 1860, 349. 
f. Phyllopneuste kennieotti (I) Baird, Tr. Chicago Ac. Sc. I, 1869, 313, pi. 30, f. 2. 
Phylloscopus borealis (1) Oordeaux, Ibis 1875, 179; (2) Seeb. & H. Brown, Ibis 1876, 216; 
(3) Collett, P. Z. S. 1877, 43—47; (4) Wald., t c. 697, 762; (5) id., ib. 1878, 
342, 950; (6) Hume & Davis., Str. F. 1878, VI, 353; (VII) Dresser, B. Eur. 11, 
510, pi. 79 (1878); (8) Ward! Rams., P. Z. S. 1880, 14; (9) Salvad., Orn. Pap. 
II, 1881, 428; (10) Seeb., Cat B., V, 1881, 40; (11) id.. Ibis 1882, 375; (12) Severtz., 
Ibis 1883, 66; (13) Oates, B. Brit Burmah 1883,1,77; (14) Meyer, Isis, Dresden 
1884, 47; (15) Pleske, Bull. Ac. Sc. Petersb. 1884, 129; (16) Matschie & Ziemer, 
