Genus TRERON. 
The genus T’reron is very closely allied to Osmotreron, and our sole 
Indian species of the genus, 7’. nipalensis, is extremely like Osmotreron 
phayret in coloration. The former can, however, be distinguished at once 
by the fact that the soft cere does not cover the top of the culmen next 
the fore-head, the horny portion, or ramphotheca, extending over the 
whole of the culmen. There is also a wide naked space round the eye. 
In the Indian species the vivid green of this orbital skin and the 
equally vivid red of the base of the upper mandible, distinguishes at a 
glance this species from all our other Green Pigeons. 
There are only two species of T'reron—our Indian bird nipalensis, 
and nasica, which is found in Sumatra, Engano, Bangka, and possibly 
southern Borneo. But our bird is, as a matter of fact, only a sub- 
species of T'reron curvirostra of Borneo, Sumatra, etc., as I show when 
dealing with the distribution of the two forms; though, having but 
the one subspecies within Indian limits, we need not, in this instance, 
adopt the trinomial system. 
(13) TRERON NIPALENSIS (Hodg.). 
THE THICK-BILLED GREEN PIGEON. 
(PLATE 5.) 
Toria nipalensis Hodg., As. Nes., XIX p. 164 pl. rx (head and foot) 1836 ; 
Blyth and Wald., B. Burma, p. 143. 
Treron nipalensis Blyth, J.A.S.B., XIV p. 847; id., Cat. B.M.A.S.B., p. 228; 
Jerdon, B.L., Ill p. 245; Godw.-Aus., J.A.S.B., XLII pt. 2 p. 171; 
Hume and Oates, Str. Feath., III p. 160, Wald., B. Burma, p. 145 ; 
Hume and Dav., Str. Feath., VI p. 410; Hume, ib., VIII p. 100; id., 
Cat. no. 771; Bingh., Str. Feath., IX p. 193; Hume and Inglis, ib., 
p. 257; Oates, B. Burma, II p. 306; id., Str. Feath., X p. 235; Hume, 
ib., XI p. 289; Salvadori, Cat. B.M., XXI p. 34; Sharpe, Hand-List, 
I p. 54; Oates, Cat. Eggs B.M., I p. 83; Stuart Baker, J.B.N.HS., 
X 363; Inglis, ib., XI p. 475; H. R. Baker, ib., XVII p. 764; Stuart 
Baker, ib., XVII p. 971; Harington, ib., XIX p. 308. 
Treron nepalensis Oates, in Hume’s Nests and Eggs, 2nd ed., II p. 370; Blanf., 
Avi. Brit. I., IV p. 14. 
Hook-billed Pigeon Lath., Syn., II p. 632 (1783). 
Columba curvirostra Gm., Sys. Nat., I p. 777 (1788). 
