108 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 
This magnificent Nightjar was rather common in the well-wooded portions of Siam, 
though not quite as common in the North as among the mountains on 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 hard 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 some- 
what different from that 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 of nearly adult bird. 
Forehead, crown and nape pale »Brussels brown» (Ridgway. Nom. Col. Plate IIT) 
with faint black vermiculations (more strongly on the nape) and some larger black spots 
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 spot at the 
middle line near the tip; outer secondaries darker isabelline and with strongly marked 
spots; 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 pale rusty brown 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 spot on each web of the feather]. 
209. Caprimulgus macrurus albonotatus. Tick. 
Caprimulgus macrurus ambiguus: Gyldenstolpe I p. 57; Gyldenstolpe III p. 232; Robinson III p. 735. 
do Pak Koh “/,; 1914. LL = 285 mm.; W = 208 mm.; T = 164 mm.; C = 10 mm. — Irides: blackish 
brown. Bill: dark brown. Legs: pale 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. 
