Birds of Celebes: Falconidae. 
31 
to that mountain of North Borneo (14)\ Gurney mentions a specimen captured 
at sea off the Natuna Islands on 14*^ November (not “Nantura” as Gurney 
writes, see I i), and we cannot agree with him that it had “accidentally” wandered 
so far to the southward (m 2) \ the same author elsewhere expresses the opinion 
that it may occur as “only a winter visitor to Java” (P. Z. S. 1878, 938), and 
Dr. Sharpe takes the same view. But, since other species, such as Tachyspizias 
soloensis, Butastur indicus and Ninox scutulata japonica, migrating southwards from 
China and Japan, appear to fix their winter limits in Borneo and North Celebes, 
going little south of the equator, it is desirable to ascertain whether the birds, 
which invade Java in our winter, are not wanderers from India and Tenasserim, 
making a movement similar to that which appears to take place with Butastur 
liventer of the same regions. 
More inquiry should also be made as to whether the Philippine Islands 
are really inhabited by a stationary and distinguishable race, inasmuch as the 
few specimens known from those quarters appear to have been obtained during 
the time of the southern migration from China. Luzon, January; Guimaras, 
March (Meyer n 1)\ Mindanao, Dec. — April (Koch o T)\ Mindanao — 4 speci- 
mens, April (Everett j 3)\ Luzon, 2 sometime between Jan. P* and April 3’^'* 
(Whitehead f2), 1 in winter, Luzon (Whitehead / J). 
A single specimen of A. virgatus gularis obtained in North Celebes (Gorontalo) 
by Dr. Pie del has been most kindly lent to us by Mr. Pleske; it is now 
preserved in the St. Petersburg Museum. It is a new addition to the avifauna 
of Celebes. Djampea Island, from where Mr. Hartert records three specimens, 
also falls within the Celebesian Province as defined in this book. 
Appended is a general description of the^ species and of the above speci- 
men from Celebes. 
Figures and descriptions. Temininck & Schlegel il\ Gurney /o J, J 5, k 4^ on P on 2\ 
Sharpe 17, k 5\ Hume k 7; David & Oust. I 2\ Grant on 5] Blanford m 7. 
Adult (general description). Above blackish slaty, ear-coverts and sides of neck greyer; 
tail ashy grey crossed with three or four bars of blackish; throat, abdomen and 
under tail-coverts white, the former marked with a dark mesial streak; rest of 
under surface vinous chestnut; under wing-coverts whitish marked with brown; 
wing below ashy crossed with blackish bars. 
Measurements (from Grant on 5 converted to mm). 
Wing 
Tail 
Tarsus 
Typical A. virgatus Q 
183 
145 
51 
A. virgatus affinis Q 
203-221 
168-180 
55-56 
A. viogatus gidaris Q 
183-190 
127-142 
50-53 
A. viogatus gidaris (J' 
157-167 
114-119 
41-47 
A. virgatus onanileoisis § 
175-178 
137-140 
52-53 
A. virgatus onaoiilensis ry' . . . . 
152-155 
122-124 
51 
A. o'irgatus o'ufotibialis 
149-150 
114-117 
46 
