KUNGL. SV. VET. AKADEMIENS HANDLING AK. I! \NI) 56. VO 2. I!» 



Two specimens of this somewhat rare Forktail were collected during my journey, 

 one male at Doi Par Sakeng in Northwestern Siarn and one tnale al Koon Tan in fche 

 Northern parts of the conntry. 



Both these specimens are immature and the white patch on t Ii*- crown is totally 

 absent, the crown being dnsky black like the nape and upper back. 



Compared with two adult specimens of the typical //. /. leschenavlli. Vieill. from 

 Java in the collections of the Royal Natural History Museum in Stockholm, the Siame e 

 birds are at once distinguished in having slanting white tips to the tail-feathers instead 

 of round ones as in H. 1. leschenaulti. 



The Siamese specimens have fairly broad white tips to the outer secondaries thus 

 resembling H. maculatus Vig. and //. sinensis, Gould., though they differ from both 

 these species by their smaller size. 



83. Henicurus schistaceus. Hodgs. The Slaty-backed Forktail. 



Henicurus schistaceus: Gyldenstolpe II; Gyldenstolpe III p. 170. 



$ Doi Tar Sakeng l % 1914. L = 205 mm.; W = 9(5,2 mm.; T = 111 mm.; C = 18 mm. — £ Doi 

 Par Sakeng 16 /t 1914. L = 203 mm.; W = 94 mm.; T = 112 mm.; C = 17 mm. - - £ Koon Tan 2 % 1914. 

 L = 210 mm.; W = 93,5 mm.; T = 114 mm.; C = 16,5 mm. — °. Koon Tan 29 / 5 1914. L = 195 mm.; 

 W = 95,5 mm.; T= 108 mm.; C = 16 mm. — Irides: blackisli brown. Bill: black. Legs: flesb colour. 



All the specimens obtained are young birds and none lias the black chin and throat 

 of the adult bird. They have no white frontal band and the head and upper back is black- 

 isli slaty with a brownish shade on the latter; lores greyish brown mottled with 

 white; chin, throat and breast mottled with brown, more strongly on the breast; the sides 

 of the body brownish slaty; flanks, lower abdomen, upper- and lower tail-coverts pure 

 white. The extent of the white tips to the secondaries seems to be very variable and 

 in one specimen they are quite narrow and ill-defined. 



84. Larvivora cyanea. Pall. — The Siberian Blue Robin. 



Larvivora cyanea: Robinson & Kloss p. 64; Robinson II p. 149. 



J Koon Tan 22 /o 1914. I, = 132 mm.; W = 75 mm.; T = 61 mm.; C = 11 mm.; Tarsus = 23 mm. 

 — J 1 Koon Tan 6 / 5 1914. L = 145 mm.; W = 70 mm.; T = 50 mm.; C = 11 mm.; Tarsus = 23 mm. - 

 $ Koon Tan. W = 70 mm.; T = 52 mm.; C = 11 mm.; Tarsus = 24 mm. — Irides: brown. Bill: borny black. 

 Legs: påle brown. 



The Siberian Blue Robin is probably a resident bird to Siarn, as specimens w T ere 

 obtained among the Koon Tan Hills in May and September. 



It keeps entirely to very dense forests, among the undergrowth of which it lives. 

 It is very retiring in its habits. Besides this, it very seldom uses its wings, why it easily 

 escapes notice. It is a silent bird too, and I never heard it utter any call. Generally 

 found single, more seldom in pairs. 



K. Sv. Vet. Akad. Haiull. Band 56. N:o 2. 7 



