26 
Birds of Celebes: Falconidae. 
(Measurements continued.) 
Wing 
Tail 
Tarsus 
Bill 
from cere 
g. (Sarasin Coll.) vix ad. E. of Peak of Bonthain, 
c. 900 m. S. Cel. 25. X. 95 
170 
125 
54 
12.5 
h. (Sarasin Coll.) juv. Tomobon, N. Cel. 3. X. 94 . 
168 
129 
50 
12.5 
(Nr. 6721) [q^] juv. N. Celebes (v. Musscbenbr.) . 
161 
122 
51.5 
13 
Distribution. Celebes: Minabassa (v. Eosenberg b 2, v. Duivenbode b 2,d3, etc.), Gorontalo 
Distr. (For s ten a 1, Eosenberg b 2, Eiedel 9), Southern peninsula — Macassar 
(Wallace 2, 3, Everett 13), Mt. Bonthain fP. & F. Sarasin, Everett 13), Dongala 
W. Celebes (Doherty 14). ' / > 
Nothing is known of the habits of this Hawk. It was made the type of 
Kaup’s genus Teraspiza, but the distinguishing characters given are very slight 
and the differences not appreciable at first sight. How insufficient they are may 
be gathered from the fact that even Kaup failed to see that the allied 
A. sulaettsis, of w'hich he had a specimen, belonged to the same genus, and 
placed it in another {Uraspiza Kaup), though Schlegel would not alloAv it 
later even subspecific distinction from A. rhodogaster (c 1, h 2). It is distin- 
guishable from that slightly differentiated geographical species by the bars on 
the wing below being nearly twice as broad, and in the male they are noticeable 
down to the tip of the wing, w'hereas in the male of A. sulaensis the bars are 
quite obliterated on the free end of the wing for about 4 cm; the Sula form 
also seems to be smaller. It is interesting to find that a closely corresponding- 
process of w’ing-differentiation and of size has occurred in the Celebesian and 
Sulan forms of Spilornis (cf. antea, pp. 2, 4). Accipiter sulaensis differs further by 
its vinous (not grey) ear-coverts. 
The resemblance of this Sparrow-hawk to the White-spot Hawk, Spilospizias 
trinotatus, is very perfect, though the curious white spots on the tail of the 
latter, and the structural differences pointed out in our article (p. 24), at once 
serve to distinguish them. What is more remarkable is that the young, which 
are totally different from the parents, are closely similar in both species. Moreover 
the young, especially at least that of A. rhodogaster (by reason of the plain 
bars on the wings and tail), are just like Kestrels! The young of birds by their 
first dress often seem to “throw back” to a distant ancestral form, but the in- 
dications generally seem as if obsciu-ed by superimposed influences inherited 
from the parents, and, when not so obscured, the question comes in, whether 
the similarity really has the meaning which one is prompted to attach to it. 
* 10. ACCIPITER SULAENSIS (Schl.). 
Sula Vinous-breasted Sparrow-hawk. 
a. Nisus sulaensis (I) Schl., Valkv. 1866, 26, 64, pi. 16, f. 3, 4. 
b. Uraspiza sulaensis (1) Kaup, P. Z. S. 1867, 176. 
Accipiter sulaensis (1) Wall., Ibis, 1868, 10, 20; Gray, HL. 1869, I, 34; (2) Sharpe, Oat. B. 
1874, I, 146; (3) Gurney, Ibis, 1875, 484; (4) M. & Wg., Abb. Mus. Dresden 
1896, Nr. 2, p. 7. 
