584 MANUAL OF PHILIPPINE BIRDS. 
Genus ACANTHOPNEUSTE Blasius, 1858. 
Bill slender and acute, a slight notch near its tip; rictal and nasal 
bristles short; wing long and y@MAted; first primary very short, slender 
and acute, usually little more or less in length than primary-coverts ; 
third and fourth primaries longest; tail moderateyin length and square; 
tarsus and toes slender; bill from nostril less than one-half tarsus 
and equal to hind toe with half its claw; divisions between tarsal 
scutes obsolete. Upper parts dull olive-green, under parts pale yellow 
or white. The birds of this genus resemble some of the small flycatchers 
(Cryptolopha), but are distinguished by their short first primary. 
Species. 
a. Second primary equal to or greater than the sixth. 
b*. First primary shorter, from 7.5 to 11.5 mm. in length, equal to or less than 
the primary-coverts; under parts grayet..............-------s-00 borealis (p. 584) 
b*. First primary longer, from 12.5 to 15 mm. in length, and longer than primary- 
coverts; under parts yellower. 2.20328 cscs seeste tee xanthodryas (p. 585) 
a’, Second primaiy equal to or greater than the ninth, and from 17 to 20 mm. in 
length; ynder pants grayish yellow. 2.2.0: cc osseew. Sh ocsoteaecerene lugubris (p. 586) 
568. ACANTHOPNEUSTE BOREALIS (Blasius). 
NORTHERN WILLOW WARBLER. 
Phyllopneuste borealis BLastus, Naumannia (1858), 313. 
Phylloscopus borealis SEEBouHM, Cat. Birds Brit. Mus. (1881), 5, 40; WuHrItE- 
HEAD, Ibis (1899), 210 (migration). 
Acanthopneuste borealis Oates, Fauna Brit. Ind. Bds. (1889), 1, 412; 
SHARPE, Hand-List (1903), 4, 216; OaTEes and REID, Cat. Birds’ Eggs 
(1905), 4, 227; McGrecor and WorcEsTER, Hand-List (1906), 90. 
Balabac (Everett); Bantayan (McGregor); Basilan (McGregor); Bohol (Me- 
Gregor); Calamianes (Bourns € Worcester, McGregor); Calayan (Mc(iregor) ; 
Caluya (Porter); Cebu (Mciregor); Cuyo (McGregor); Fuga (Mc(iregor) ; 
Guimaras (Bourns & Worcester) ; Leyte (Hverett); Lubang (McGregor) ; Luzon 
(Everett, Whitehead, McGregor, Bartsch); Maestre de Campo (McGregor € 
Worcester); Masbate (Steere Exp.); Marinduque (Steere Hap.) ; Mindanao 
(Everett, Steere Exp., Celestino); Mindoro (Bourns & Worcester, Whitehead, 
McGregor); Negros (Whitehead); Palawan (Whitehead, Platen, Steere Ezxp., 
Bourns & Worcester); Panay (Steere Hap.); Polillo (McGregor) ; Romblon 
(Bourns & Worcester); Samar (Bourns & Worcester); Sibuyan (Bourns & 
Worcester); Siquijor (Celestino); Tablas (Bourns & Worcester); Ticao (Mc- 
Gregor); Verde (McGregor). Northern Europe, northern Asia, Alaska, Com- 
mander Islands; in winter to China, Formosa, Indo-Chinese provinces, Malay 
Peninsula, ana Borneo. 
“Coloration.—Upper plumage olive-green, lighter on the rump; wings 
brown, the outer webs edged with olive-green; wing-coverts brown on 
the inner and olive-green on the outer webs; the median and greater 
coverts with yellowish white tips forming two bars; tail brown, the 
outer webs edged with olive-green; a broad and well-defined eye-streak, 
reaching to the nape, yellowish white; lores brown; ear-coverts olive 
