TRERONID.E. 



b" . Tail almost even, or with the outer 

 feathers very little shorter than the 

 others ; third quill always scooped on 

 the inner web. 

 b"'. Tibial feathers conspicuously yellow. 

 a*. First three primaries not acumi- 

 nate ; forehead in some species 



more or less naked 2. Vinago, p. 15. 



b l . First three primaries more or less 



acuminate 3. Cnocoprs, p. 26. 



c". Tibial feathers greenish or whitish . 6. Osmotreron, p. 38. 

 b'. Rhamphotheca of the upper inaudible 

 reaching the feathers of the forehead, 

 c". Third primary normal, not scooped 



about the middle of the inner web .... 4. Btjtreron, p. 32. 

 d 1 '. Third primary deeplvscooped about the 



middle of the inner web 5. Treron, p. 33. 



. General plumage chocolate-brown ; tail of 



12 feathers, and much rounded 7. Phabotreron,p.66. 



1. SPHENOCERCUS. 



Type- 



Sphenurus, Sw. (nee Sphenura, Licht. 1823) Class. B. 



ii. p. 348 (1837) S. oxyurus. 



Sphenocercus, G. B. Gr. List Gen. B. p. 57 (1840) 



( = Sphenurus, Sw.). 

 Rhornbura, Gloy. Gem. Hand- u. Hilfsb. d. Naturg. i. 



p. 360 (1842) S. oxyurus. 



Sphenaena, Bp. Ann. Sc. Nat. (4) i. p. 139 (1854). 

 Sphenoena, Bp. Consp. Gen. Av. ii. p. 8 (1854). 

 Sphenotreron, Bp. in lift. ; id. Consp. Gen. Av. ii. p. 8 



(1854) ; id, Compt. Bend, xxxix. p. 873 (1854). 



Range. From Northern India to Formosa and Japan, and through 

 Burma, to Sumatra, Borneo, and Java. 



Key to tlie Species. 



a Central tail-feathers long and acuminate ; third 



and fourth primaries broadened about the middle 



of tbe inner web ; tail underneath with abroad 



grey band at the tip. 



a . Central tail-feathers very long, narrow, and 



grey; greater wing-coverts broadly edged 



with yellow apicicauda, p. 5. 



b' . Central tail-feathers broad, of a russet-colour, 

 except at the base, which is grey ; greater 

 upper wing-coverts with no yellow edges 



whatever oxyurus, p. 7. 



b. Central tail-feathers not very long and not acumi- 

 nate. 

 e . Under surface of the tail uniform light grey ; 

 third and fourth primaries very little broad- 

 ened about the middle of the inner webs. . . . sphenurus, p. 8. 



