Birds of Celebes; Treronidae. 
599 
Diagnosis, cf. Like 0. tvallacei Salvacl., cf, of Celebes, but larger, the bill relatively 
larger and more robust, the bind head and nape grey like the crown, the back and 
scapulars a shade darker mealy maroon -purple; middle of chin and throat greyer, 
less yellow- ochraceous (GiSangi, C 12656; Siao, 0 12641; Tagulandang, 0 1 350 1). 
Female. Like 0. tvallacei $ , but larger, and with a bigger bill, the hind head generally 
greyer, the chin and throat more tinged with grey (Gt. Sangi, 0 12657 ; Siao, C 12639; 
Tagulandang, C 13502). 
Young male. Like the adult female; the back and scapulars with feathers of dark vinaceous 
purple as in the adult male intermingled, the wing-coverts and inner quills edged 
with yellow (Tagulandang [o’], 0 13500). 
Measurements. 
a. (C 12656) ad. [O'], Gt. Sangi, 20. VII. 93 (Nat. Coll.) 
h. (Nr. 13148) ad [O'], Gt. Sangi (Meyer) ..'... 
c. (C 12657) ad. [2], Gt. Sangi, 20. VII. 93 (Nat. Coll.) 
d. (C 12657) ad. [21, Gt- Sangi, 24. VII. 93 (Nat. Coll.) 
e. (C 12610) ad. [O’], Siao, 5. VH. 93 (Nat. Coll.) . . 
f. (C 12641) ad. [O'], Siao, 29. VI. 93 (Nat. Coll.) . . 
g. (C 12639) ad. [2], Siao, 2. VII. 93 (Nat. Coll.) . . 
h. (Nr. 13145) ad. [2], Siao (Meyer) 
i. (TringMus.)ad.[0'], Tagulandang, 4. Vin.9 I (NatColl.) 
j. (C 1 350 1 ) ad. [O’], Tagulandang, 20. Vm. 94 (N at. Coll.) 
k. (C 13502) ad [21, Tagulandang, 6.Vni. 94 (Nat. Coll.) 
l . (C 13500) imm. [O'], Tagulandang, 2. VUI. 94 (Nat. Coll.) 
Nor further measurements: cf. W. Bias. til. 
Distribution. Sangi Islands: Great Sangi (Rosenb. a 3, d 1, Ho 
Coll.); Siao (Hoedt a 3, Duivenb. a 3, Nat. Coll.); Tagulandang (Nat. Coll.) 
Wing 
Culmen 
(homy 
terminal 
portion) 
Tarsus 
164 
14.5 
25.5 
164 
16 
25.5 
160 
15 
24 
159 
14.5 
24.5 
165 
15 
24 
155 
15 
24.5 
162 
14,5 
24.5 
157 
14.5 
23 
158 
15 
24 
159 
14.5 
24.5 
160 
14.5 
25 
160 
14 
24 
i a 3,: 
Platen t 
^ 1, N at. 
Extremely near as this form stands to O. wallacei of Celebes, it is not known 
to intero-rade with it, individual variation running within narrow limits. Birds 
from Tagulandang probably average two or three millimeters smaller than those 
of Great Sangi, but they appear to be otherwise identical with them ; those from 
Banka, Mantehage and Manado tua Islands are , on the other hand , about a 
centimeter shorter in the wing and cannot be separated from 0. wallacei. Truly 
intermediate specimens we have not been able to find, the smallest Siao bird 
(wing 155) having the bill larger than in any Celebes specimen. This species 
seems to be absent in Talaut. 
253. OSMOTRERON VERNANS (L.). 
Grey-tailed Green Dove. 
a. Columba vernans (Ij Linn., Mant. 1771, 526. „ ^ -r> r. i , 
I Treron vernans (1) Steph., Gen. Zool. 1826, XIV, I, 274; (2) Schl., Mus. P.-B., Columbae, 
1873 49; Salvad., Cat. Ucc. Borneo 1874, 286; (4) Rosenb., Malay. AiHup. 
1878 275; (5) Buttik., Notes Leyden Mus. 1887, 75, 95; (6) Everett, J. Str. Br. 
R A. S. 1889, 196; (7) Vorderman, N. T. Ned. Lid. 1890, L, 501 ; (8) Sh. & Wlitd., 
