20 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOI.OGICAL EXPEDITIONS TO SIAM. 



<$ Koon Tan 7 / ö 1914. L = 215 mm.; W = 121 mm.; T = 125 mm.; Bill from gape = 23 mm. — <$ Doi 

 Par Sakeng 19 /7 1914. L = 215 mm.; W = 110 mm.; T = 119 mm.; Bill from gape = 21 mm. — Irides: 

 brownish black. Bill: black. Legs: black. 



Fairly common in the Northern and Central parts of the country. The specimens 

 obtained by me are practically intermediate between the typical C. a. oenea Vieill. and 

 C. a. malayensis Blyth. which inhabits more southern districts. 



In the collections of the Royal Nat. Hist. Museum in Stockholm there are two 

 specimens from Ahsown in Tenasserim which are typical C. a. malayensis. In this spe- 

 cies the underparts of the body are almost black with a distinct metallic gloss especially on 

 the breast; the metallic colour on the upper parts of the body is continued to the rump 

 and upper tail-coverts. 



The specimens from Northern Siarn are decidedly more greyish on the under parts 

 of the body and there is only a slight gloss on the breast. The rump and the upper tail- 

 coverts are, however, glossy metallic green and not inclining to gre3 7 ish as in typical 

 Ch. a. oenea. 



The Tenasserim specimens are also slightly smaller. 



8. Chibia hottentotta. Linn. - The Hair-crested Drongo. 



Chibia hottentotta: Barton p. 106; Gyldenstolpe I p. 28; Gyhlenstolpe II; Gyldenstolpc III p. 167. 



<$ Doi Par Sakeng "/» 1914. I, = 305 mm.; W = 165 mm.; T = 147 mm. — J Koon Tan 30 /4 

 1914. L = 305 mm.; W = 170 mm.; T = 147 mm. — $ juv. Bång Hue Pong 2:, /5 1914. L = 275 mm.; 

 W = 144 mm.; T = 120 mm. — Irides: brown. Bill: black. Legs: black. 



The Hair-crested Drongo was rather common on suitable localities in the Northern 

 parts of the country, though apparently very locally distributed. 



It has not yet been found at Bangkok or its neighbourhood, but during my previous 

 Expedition to Siarn I obtained a specimen on the Korat plateau, which seems to be 

 about its southern limits in Siarn. It has, however, been collected by Davison in Tenasse- 

 rim south to about the same latitude. 



Further east it seems to extend more to the south as Dr. Tirant records it from 

 Cochin China. 



9. Buchanga atra cathoeca. Swinh. The Black Drongo. 



Buchanga atra: Oustalet 1903 p. 29. 



Dicrurus äter: Parrot p. 116; Williamson I p. 42; Williamson II p. 81; Barton p. 105; Gyldenstolpe I p. 27; 

 Gyldenstolpe II; Gyldenstolpe III p. 167; Gairdner p. 148. 



J Koh Lak 15 /i 2 1914. L = 247 mm.; W = 133 mm.; T = 134 mm.; Bill from gape = 26 mm. — 

 Irides: brownish red. Bill: black. Legs: black. 



The Black Drongo is one of the birds most often met with in every part of Siarn 

 where the forests are not too thick. It was never, as far as I can remember, obtained in 

 dense primeval forests, which it seems to avoid. It is not at all shy and as it is chiefly 

 found in open jungles or near houses and villages it is very easy to study its habits. 



