KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 56. wN:0 2. 49 
Two specimens of this somewhat rare Forktail were collected during my journey, 
one male at Doi Par Sakeng in Northwestern Siam and one male at Koon Tan in the 
Northern parts of the country. 
Both these specimens are immature and the white patch on the crown is totally 
absent, the crown being dusky black like the nape and upper back. 
Compared with two adult specimens of the typical H. 1. leschenaultt, VIEILL. from 
Java in the collections of the Royal Natural History Museum in Stockholm, the Siamese 
birds are at once distinguished in having slanting white tips to the tail-feathers instead 
of round ones as in H. I. leschenaultt. 
The Siamese specimens have fairly broad white tips to the outer secondaries thus 
resembling H. maculatus Vie. and H. sinensis, GouLp., though they differ from both 
these species by their smaller size. 
83. Henicurus schistaceus. Hopas. — The Slaty-backed Forktail. 
Henicurus schistaceus: Gyldenstolpe II; Gyldenstolpe III p. 170. 
@ Doi Par Sakeng 15/7 1914. L = 205 mm.; W = 96,2 mm.; T= 111 mm.; C=18 mm. — J Doi 
Par Sakeng '%/; 1914. L—=203 mm; W = 94 mm; T= 112 mm; C=17 mm. — ¢ Koon Tan *9/5 1914. 
L=210 mm; W= 93,5 mm; T=114 mm; C= 16,5 mm. — @ Koon Tan */5 1914. L=195 mm.; 
W = 95,5 mm.; T = 108 mm.; C= 16 mm. — Irides: blackish brown. Bill: black. Legs: flesh colour. 
All the specimens obtained are young birds and none has the black chin and throat 
of the adult bird. They have no white frontal band and the head and upper back is black- 
ish 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. Paty. — The Siberian Blue Robin. 
Larvivora cyanea: Robinson & Kloss p. 64; Robinson II p. 149. 
& Koon Tan 78/9 1914. L = 132 mm; W =75 mm.; T=61 mm.; C=11 mm.; Tarsus = 23 mm. 
— of Koon Tan §/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: horny black. 
Legs: pale brown. 
The Siberian Blue Robin is probably a resident bird to Siam, as specimens were 
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, Handl. Band 56. N:o 2. 1 
