76 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 
This species which is closely allied to Cyornis rubeculoides Vic. was very common 
in the North of Siam and a fine series was collected. 
Roginson & Kuoss state (Ibis 1911 p. 52) that it ought to be regarded as a southern 
form of C. tickellie Buytu. I think that it must be placed nearest to OC. rubeculoides 
Via., which is practically intermediate between C. dialilema Satvap. and C. tickellie, 
BiytH. or O. swmatrensis SHARPE. Cyornis dialilema differs from C. rubeculoides which 
I also obtained in Siam, by having the abdomen and flanks pure white, while these same 
parts in C. rubeculoides are tinged with orange buff. The orange colour of the breast and 
throat does not extend so high up on the chin in C. dialilema as it does in C. rube- 
culoides, C. tickellie and in C. swmatrensis. 
138. Cyornis rubeculoides. Vic. — The Blue-throated Flycatcher. 
Cyornis rubeculoides: Gairdner p. 149. 
Siphia rubeculoides: Bonhote p. 60. 
do Koon Tan %/, 1914. L=138 mm; W = 66 mm; T = 61 mm. — ¢ Koon Tan 7/5 1914. 
L=143 mm; W=69 mm; T= 64 mm; C=11,5 mm. — 6 Koon Tan 7/5 1914. L = 130 mm.; 
W = 67 mm.; T = 61 mm.; C = 11,3 mm. — Irides: brownish black. Bill: black. Legs: pale brown. 
Not as common as C. dialilema, Satvav. though occurring in the same localities 
but apparently at higher altitudes. The specimens obtained by me were all shot on the 
summits of the highest hills among the Koon Tan range where they occurred either in 
pairs or in small flocks among the pine-trees. 
In colour they very much resemble C. dialilema but the upper parts of the body 
are of a paler blue. The flanks and sides of the body are buffy white instead of pure 
white and the orange colour of the breast extends higher up on the throat. 
139. Cyornis sumatrensis. SHARPE. 
Cyornis sumatrensis: Robinson & Kloss p. 51; Robinson III p. 147. 
do Koh Lak Paa “/12 1914. L = 130 mm.; W = 67 mm; T = 62,4 mm.; C = 11,2 mm.; Tarsus = 
16,8 mm. — @ Koh Lak Paa “/i2 1914. L = 125 mm.; W = 64,5 mm.; T= 60 mm. C = 10 mm.; Tarsus = 
16,5 mm. — Irides: brown. Bill: black. Legs: plumbeous. 
Only two specimens of this Flycatcher were obtained during my journey. They 
were both shot in a dense evergreen forest among the hills on the boundary between Siam 
and Tenasserim. . 
This is a somewhat rare species, which until quite recently only was known from 
the type and another male obtained in Kelantan and recorded by HaRrrert (Novitates 
Zoologice, Vol. IX, 1902 p. 549). In the last few years, however, several specimens and 
among them some females — until then undescribed — were obtained by Ropinson & 
Kuoss during their Expediton to the Northern Parts of the Malay Peninsula (vide. [bis 
1911 p. 51—52). It has also been recorded by Roxsinson from the Siamese Islands 
of Koh Samui and Koh Pennan. 
