180 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



dinarily worn and decolorized; this process reaches its peak at the 

 end of summer. Specimens taken at various places between August 

 3 and September 15 are molting the quills of wings and tail ; one of 

 October 13 is acquiring the new feathers of the crown, but not of the 

 nape ; a bird of October 26 has wholly completed the molt. 



A male in breeding condition had the irides bright yellow ; the cere 

 olive-brown ; the bill olive-green, tipped yellow ; the toes greenish yel- 

 low ; the claws horny gray with the apical half blackish. 



This species is considerably larger than the preceding. It has the en- 

 tire upperparts dark brown, barred with buff, fulvous, or white from 

 forehead to tail tip; the underparts white, with a dark brown gor- 

 get across the throat (at the center extending to base of bill), dark 

 brown bars at the sides of the breast, and broad rufous streaks on the 

 flanks and belly. 



There seems to be no significant size difference between the sexes. 

 The wing lengths of thirteen adult hrugeli (eastern and southeastern 

 Thailand) vary from 134 to 147.2 mm. ; of 18 northern specimens, from 

 138.5 to 152.5 mm. ; of an unknown number of rufescens {fide Stuart 

 Baker) , from 141 to 162 mm. (the smallest measurements probably due 

 to inclusion of birds better called hrugeli) . Our population is thus in- 

 termediate between the two races but, as is the case with other north- 

 ern owls, is somewhat nearer the smaller, southern form. 



I find no records for the occurrence of this species at Bangkok or in 

 its immediate neighborhood. 



NINOX SCUTULATA BURMANICA Hume 



Burmese Brown Hawk Owl 



N[inox~i burmanica Hume, Stray Feathers, vol. 4, 1876, pp. 285-286 (Pegu and 

 Tenasserim ) . 



Ninox scutulata, Gyldenstolpe, Kungl. Sveuska Vet.-Akad. Handl., 1913, p. 61 

 (Den Chai, "Vang Nun") ; 1916, p. 121 (Pha Kho, Khun Tan, Ban Mae Na) ; 

 Journ. Nat. Hist. Soc. Siam, 1915, p. 233 (listed). 



Ninox scutulata burmanica, Gyldenstolpe, Ibis, 1920, p. 753 ("Northern . . . 

 Siam"). — Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, 164 (Chiang 

 Mai) ; 1936, p. 90 (Chiang Mai). — be Schauensee, Proc. Acad. Nat. Sci. Phila- 

 delphia, 1934, p. 269 (Chiang Mai).— Riley, U. S. Nat. Mus. Bull. 172, 1938, 

 p. 152 (Doi Langka). 



The hawk owl is a rather uncommon resident throughout the 

 northern provinces. Eisenhofer sent to Stockholm a female collected 

 at Huai Pu, May 24, 1912, and two undated specimens from Khun 

 Tan. I have taken it at Chiang Mai and at Ban Khana and have 

 seen it in the forest west of Ban Na Noi (Nan Province). 



This is a lowland species occurring both in mixed-deciduous jungle 

 and in tall, dense trees near monasteries and villages. It is very 

 inactive during the day, and for this reason I have never succeeded in 



