90 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 
This is especially evident in the males, where the colour of the back is very bright and 
mixed with yellow. The rump is washed with golden yellow and well-marked off from 
the rest of the upper plumage. The wings are brightly washed with olive and the under- 
parts of the body are much paler than in typical occipitalis. As in that species the 
lower mandible is pure black. 
The Siamese Grey-headed Green Woodpecker therefore constitute a well-marked 
race. I have had the pleasure of naming this new form in honour of Dr. Ericu HEssE 
who has made such a good work to the proper understanding of the geographical distri- 
bution and the generic position of the species and subspecies of several Woodpeckers. 
Types of the subspecies: 
Adult male collected at Pak Koh, Northern Siam */, 1914. 
Adult female, collected at Den Chai, Northern Siam "/, 1912. 
The female is similar to the male but is lacking the red colour on the crown, which 
is pure back. The general colouration is also slightly paler than that of the male. 
The Grey-headed Green Woodpeckers collected during my former journey 1911— 
1912 and by me referred to Picus canus occipitalis Vic. also belong to the new form, 
as shown by a careful examination of a series. 
Picus canus hessei inhabits the forests of Northern Siam and was never found in 
the Siamese Malaya. It seems to prefer the deciduous forests to evergreen jungles. 
169. Brachylophus chlorolophus chlorolophus. Vierm1. — The Small Himalayan 
Yellow-naped Woodpecker. 
Picus chlorolophus chlorolophus: Gyldenstolpe I p. 47; Gyldenstolpe II; Gyldenstolpe II p. 229. 
Gecinus chlorolophus: Barton p. 106. 
do Bang Hue Pong °/5 1914. L = 245 mm.; W = 136 mm; T= 96 mm; C = 27 mm. — 
dS Pak Koh °3/s 1914. L == 243 mm.; W = 138 mm.; T = 118 mm.; C = 25 mm. — Q Pak Koh 2/3 1914. 
L = 255 mm; W= 137 mm.; T = 116 mm.; C = 22,5 mm. — of Doi Par Sakeng 14/7 1914. L = 247 
mm.; W = 128 mm.; T= 115 mm.; C = 25 mm. — Irides: reddish brown. Bill: black with the base yellow. 
Legs: greenish olive. 
This species was rather common in the deciduous forests in the North of Siam. It 
was generally observed either single or in pairs. As already stated by Hareirr (Cat. 
Birds Brit. Mus., Vol. 18 p. 60) the white spotting on the outer webs of the primaries is 
very inconstant, and of the 6 specimens collected in Northern Siam three are quite lacking 
these spots while in the other three specimens these spots are quite distinct. 
170. Brachylophus chlorolophoides. GyLDENSTOLPE.’ 
Plate 2, fig. 3. 
do Koon Tan *4/, 1914. L = 255 mm.; W = 136 mm.; T = 104 mm.; C = 24 mm.; Tarsus = 18 
mm. — Tris: crimson. Bill: black, edges of the base dirty yellow. Legs: brownish yellow. 
Description: Adult male. 
Upper parts yellowish green, brighter on the rump and on the upper tail-coverts, 
the whole upper plumage suffused with a golden shade; quills dusky brown, the inner 
1 Ornith. Monatsber. 1916. No. 2, p. 29. 
