212 MANUAL OF PHILIPPINE BIRDS. 



The harriers or inarsli liawks are noticeable among birds of prey for 

 their slender form, long slender legs, and slow fliglit. Adult birds can 

 be easily identified but the immature specimens present considerable 

 difficulty. 



Species. 



(Adult.) 



a\ Upper parts black; tail silvery gray; lower breast, abdomen, and crissum 

 white. 



6^ Throat and fore breast white streaked with black spilonotus (p. 211) 



6'. Throat and fore breast black melanoleucos (p. 214) 



a". Upper parts dark brown ; tail bluish ash seruginosus (p. 215) 



(Immature.) 



aK Facial ruff complete across the throat; smaller, tarsus about 70 mm.; wing, 

 340 mm melanoleucos (p. 214) 



a'. Facial ruff incomplete; tarsus about 90 mm.; wing, 400 mm. 



6*. Lighter; general color more rufous-brown spilonotus (p. 212) 



6'. Darker; general color more chocolate-brown serugrinosus (p. 215) 



173. CIRCUS SPILONOTUS Kaup. 



ASIATIC KARSH HAWK. 



Circus spilotwtus Kait. Cont. Orn. (1850), 59; Sharpe, Cat. Birds Brit. 

 Mus. (1874), 1, 58; Hand-List (1899), 1, 245; Blanford, Fauna Brit. 

 Ind. Bds. (1895), 3, 388; Gates, Cat. Birds' Eggs (1902), 2, 236; 

 McGregor and Worcester, Hand-List (1906), 40. 



La-uiii', Manila; )na-na-o', Calayan, all species of small hawks. 



Batan {Edmonels) ; Calayan {McCh'egor) ; Luzon (Heriot, Whitehead); Min- 

 danao (Platen) ; Mindoro {Everett) ; Palawan (Whitehead, Everett) ; Sulu (Guil- 

 Icmard). Eastern Siberia; in winter to China, Indo-Burmese countries, and 

 Malay Archipelago. 



Adult male. — Above black, nape and liiud neck narrowly streaked with 

 white; feathers of lower back and rump tipped with ashy gray or white; 

 sides of head and ear-coverts black; lower parts white; chin, throat, and 

 breast with bold black shaft-streaks; primaries black, white for basal 

 third; alula, primary-coverts, and secondaries ashy white with blackish 

 shafts ; secondary-coverts black, more or less mixed with ashy white ; under 

 coverts and axillars white ; tail ashy white ; upper tail-coverts white. Iris 

 bright yellow; legs dull yellow; cere waxy green; bill and nails black. 

 The above specimen from Tarlac Province, Luzon, measures, 520 in 

 length; wing, 410; tail, 230; culmen from base, 33; tarsus, 92; middle 

 toe with claw, 63. 



Younger male. — Color pattern similar; upper parts brown; white 

 streaks on head and neck more numerous; under parts white with wider 



