Q2 LIST OF BIRDS OF BORNEO. 
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nean specimens of many of the species are available for 
study, and until the eastern, south-western, and central dis- 
tricts of Borneo itself, and a proportion of the outlying islets 
intervening between it and the Philippines, Celebes, Java, &c., 
together with the mountains of Palawan, have been worked by 
collectors. 
The area of the Bornean group may be defined for the 
purposes of this list by a line which, starting from a point 
immediately to the west of St. Julian I. in the Tambelan 
Archipelago and being drawn to the south of the Great 
Natuna, passes northward of Labuan, and follows thence the 
100-fathom line so as to embrace Balabac, Palawan (Paragua), 
the Calamianes, and the Cuyo islands, and, returning along 
the same line of soundings on the southern side of Palawan, 
is drawn immediately to the eastward of the islands of Caga- 
yan Sulu and Sibutu—whence it is continued through the 
Macassar Straits south of the Paternoster, Lauriot (Laoet 
Ketjil) and Solombo islets, and in a north-westerly direction 
up through the Carimata Strait back to the island of St. 
Julian. 
In thus attempting to define the area within which the 
adjacent smaller islands may be regarded as being affiliated 
zoologically to Borneo, there exists no guide, in many cases, 
beyond their greater proximity to the latter island than to the 
other neighbouring large masses of land by which they are 
surrounded, and the evidence afforded by the soundings 
shown on our Admiralty Charts. The limits above adopted 
must, therefore, be looked upon as being in some degree ap- 
proximate. But as there are no islands of considerable size 
of which the fauna is wholly unknown, except the Great 
Natuna, bordering upon the line of delimitation, it is not pro- 
bable that any material extension or contractions of the boun- 
dary here assumed for the Bornean group will be necessi- 
tated by the results of future field-work. 
The present list and its arrangement being of a provisional 
and tentative character, no attempt has been made to compile 
a complete synonymy of the species enumerated. Such re- 
ferences as are given are only sufficient, as a general rule, to 
