108 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOI.OG1CAL EXPEDITIONS TO SIAM. 



Tliis magnificent Nightjar was rather comnion in the well-wooded portions of Siarn, 

 though not qirite as common in the North as among the mountains 011 the Tenasserim 

 frontier in the Siamese Malaya. Here, and especially at Hat Sanuk, numbers of specimens 

 appeared just after sunset, at first flying at a considerable height then getting lower and 

 lower down.' Especially during moonlight nights they came in mighty numbers, making 

 their presence known by their melancolic whistling notes. Like Davison I never found 

 them roosting on the ground, never did I see them at daylight but fo a single female 

 specimen which I flushed up from the ground in a very dense evergreen forest near the 

 Hat »Sanuk creek on the 18th of February 1915. I here also found a nest containing 

 only one egg of an oval shape. The colour was creamy white with blotches of lilac grey 

 and it was laid in a slight depression among the dead leaves. It was very härd set and 

 unfortunately broke when I tried to blow it. 



In May 1914 I obtained a young specimen at Koon Tan and as its plumage is somc- 

 what different from t hat of the adult bird, I will try to give a description of it, though 

 this Nightjar is one of the most difficult birds to describe properly. 



Description oj nearly adult bird. 



Forehead, crown and nape påle »Brussels brown» (Hidgway. Nom. Col. Plate 111) 

 with faint black vermiculations (more strongly on the nape) and some larger black sj)ots 

 along the middle line; elongated ear-tufts black tipped with »Brussels brown»; general 

 colour of the upper parts of the body black, the feathers edged and tipped with isabelline 

 and cinnamon rufous; quills dark brown with interrupted cinnamon rufous bars; inner 

 secondaries isabelline with the bases of the feathers finely vermiculated with black; the 

 tip of the inner secondaries pure isabelline with only a small blackish brown spöt at the 

 middle line near the tip; outer secondaries darker isabelline and with strongly marked 

 spöts; rectrices black with isabelline and black mottled bars; chin, upper throat and 

 breast blackish brown, the feathers margined and tipped with rufous brown; across 

 the throat a broad white band passing to buffy behind the ear-coverts; lower parts of 

 the body dusky brown, the feathers broadly tipped with buffy white; lores and ear-coverts 

 blackish brown, the feathers edged, tipped and spotted with rufous brown; lesser and 

 median wing-coverts rusty brown spotted and irregularly barred with black; greater 

 wing-coverts isabelline, vermiculated with black and with a narrow subterminal black bar; 

 primary coverts påle rusty brow r n irregularly barred with brownish black; scapulars isa- 

 belline, vermiculated with black and broadly tipped with black, [on these black tips there 

 is also a small chestnut spöt on each web of the feather], 



209. Caprimulgus macrurus albonotatus. Tick. 



Caprimulgus macrurus ambiguus: Gyldenstolpe I p. 57; Gyldenstolpe III p. 232; Kobiuson III i>. 735. 



ef Tak Koh i: 7i 1914. L = 285 mm.; W = 208 mm.; T == 104 mm.; C = 10 mm. — Irides: blackish 

 brown. Bill: dark brown. Legs: påle brown. 



This subspecies was fairly common in the Northern parts of the country, though 

 never observed in very dense jungle. Most often it was flushed up from the ground in 

 bamboo-jungles. 



