Birds of Celebes: Treronidae. 615 



has been observed already (pp.252, 603); and in the same way the diffusion of a 

 colour on to the parts which are placed in contact with it may be indirectly 

 due to the mechanical action of light, on the same principle as the colours of 

 pupae, which vary according to the colours of the papers upon which they 

 are placed. (See, also, Graucalus hicolor, Lalage leucopygialis , Calidris arenana, 

 Limosa melanura, Hierococcyx crassirostris, Glareola). 



Dr. Guillemard suggests some differences in the Sooloo race — larger size, 

 the feathers of the breast less bifid; we are not acquainted with this form. 



GENUS CARPOPHAGA Selby. 



These Fruit-pigeons range in size from that of a Rock -dove upwards; the 

 most usual colours are metallic green on the upper surface, grey on the head, 

 neck, and crop, and grey or rufous below, though slaty, purple, and white also 

 occur. The tarsus is feathered for about half its length, being less than in 

 Ptilopus. Wing of variable length, generally rather long; tail of 1 4 rectrices, 

 shorter than the wing, square — except in C. (Cryptophaps) poecilorrhoa in which 

 it is strongly rounded. The genus ranges from India to Papuasia and the Fiji 

 Islands, but not Australia, and Count Salvadori divides it into 6 subgenera 

 (see, below, p. 626). 



f 263. CARPOPHAGA CONOINNA Wall. 



Insular Imperial Pigeon. 

 Plate XXXIX. 



Carpophaga concinna (1) Wall., Ibis 1S65, 383, 398; (2) id., J. f. 0. 1866, 280; (3) Schl, 

 Mils. P.-B., Col., 1873, 82; (4) Briiggen:., Abh. Ver. Bremen V, 1876, 84; (5) Salvad., 

 Ann. Mus. Civ. Gen. IX, 1876, 62, 65, 200; (6) id., P. Z. S. 1878, 85, 89; (7) Meyer, 

 Verb. z.-b. Ges. Wien 1881, 772; (8) Salvad., Orn. Pap. IH, 1882, 81; (9) Sclat., 

 P. Z. S. 1883, 51, 195, 200; (10) Forbes, ib. 1884, 433; i^Jij Meyer, Isis, Dresden 

 1884, 6, 51; (12) Biittik., Notes Leyden Mus. 1886, Vm, 66; (13) W. Bias., Ornis 

 1888, 615, 642; (14) Hartert, J. f. 0. 1891, 301; (15) Salvad., Agg. Orn. Pap. 

 1891, 181 ; (16) id.. Cat. B. XXI, 1893, 186; (17) Sharpe, Ann. & Mag. N. H. 1894 

 LXXIX, 58; (18) M. & Wg., J. f. O. 1894, 249, 250; (19) iid., Abh. Mus. Dresd. 

 1895, Nr. 9, p. 7; (20) Hart, Nov. Zool. 1896, 179. 



a. Carpophaga roseinucha, part. (1) Schl., Ned. Tdschr. Dierk. 1866, m, 197, 344. 



b. Carpophaga paulina (1) Hickson (nee Bp.), Nat. in N.Celebes 1889, 41. 



c. ? Carpophaga aenea, part. (1) Hartert, Kat. Vog. Slg. Senckenb. Mus. 1891, 189. 

 "Arana", Kabruang, Talaut, Nat. Coll. 



"Aheng", Great Sangi, Siao, Tagulandaiig, Euang and BiaiTO, iid. 



For further synonymy and references cf. Salvad. 16. 



Descriptions. Wallace 1\ Salvadori S, 16\ M. & Wg. 18. 



Adult. Head, neck, mantle and under-parts pearl-grey, darker on the flanks, whitish 

 on chin, a slight vinous tinge on nape and hind neck; frontal edge whitish; under 

 tail-coverts chestnut; back wing-coverts, and rump dark metaUic golden-green, here 



