354 XOVirATES ZOOLOGICAE XXV. 1918. 



Konta, 1. iii. 1901. The first has the forehead widely bare and closely resembles 

 T . c. calva. unless it is slightly darker, but being rather dirty this is almost 

 impossible to say. Wing 171 mm. The other is lighter and more greyish on 

 the head and throat and the naked space at the base of the bill is less than the 

 rhamphotheca. If it is a male and a slip has not occurred when writing the 

 label, this biid cannot possibly be the same as the one from Djiren, and it is 

 very strange that a form with wide and one with short naked space on the bill 

 are found so close together. As it is difficult to give a good description of one 

 rather poor specimen, ^^•e do not give a name to this form at present, but have 

 no doubt that it will be named before long. The wing of the Konta specimen 

 measures 167 mm. 



Recapitulating we thus recognize the following forms : 



1. Treron calva calva (Temm.) : Kamerun to North Angola, Congo basin, 

 Kindu and Ituri Forest. Also Princes Island. 



2. Treron calva uellensis (Rchw.) : Uelle, Niam Niam. (Distribution and 

 differences requii-e further investigation.) 



3. Treron calva poensis Hart. & Goods. : Fernando Po. 



4. Treron calva sharpei (Rchw.) : Sierra Leone to Kalabar. (Boundaries 

 eastwards not yet certain.) 



5. Treron calva salvadorii (Dubois) : Apparently Tanganyka to Unyoro, 

 Uganda and Mt. Elgon. (Exact distribution not fully worked out.) 



6. Treron calva ansorgei Hart. & Goods. : South Angola, i.e. Benguella 

 and Mossamedes. 



7. Treron calva nudirostris (Swams.) : Sencgambia, but limits eastwards 

 uncertain. 



8. Treron calva brevicera Hart. & Goods. : Kilimanjaro to Athi River, 

 Kikuyu, etc. (More mformation about distribution dcshable.) 



9. Treron calva sejiincta Hart. & Goods. : Portuguese Guinea. 



10. 11. One or two insufficiently known (one bad skin each!) from south- 

 western Abyssinia or Ethiopia, collected by Oscar Neumann. 



We may thus fairly assume that, if the whole of Africa were completely 

 ornithologically explored, a full dozen forms in place of the one recognized h) 

 the Cat. B. Brit. Mus. xxi. or the three to four admitted by Reichenow, must 

 be separated. 



The forms of Treron vernans. 



It has been known for a long time that there is some geographical varia- 

 tion in this species, especially in the colour of the crown. Wallace, Ibis, 1863, 

 p. 320, said that a specimen from Penang had the head " dark slaty," while hi 

 the Macassar form the head was paler, the forehead and throat greenish, and 

 the pale lilac area narrower on the upperside, and a Bornean specimen appeared 

 somewhat intermediate, though more closely approaching that from Penang. 

 Agam, in Ibis, 1865, p. 374, he says that Penang examples had the head darker. 

 Bornean ones paler, while in a ^Macassar one the front and throat were greenish. 

 Schlegel, Nederl. Tijdschr. Dierk. i. p. 70 (1863), says that the skins from Java 

 and Celebes (Gorontalo) have the head and throat dull greenish grey (" d'un vert 

 grisatre mat"), which Salvadori (Ann. Mus. Civ. Genova, v. p. 287), wrongly 



