226 ZOOLOGICAL RESEARCHES 



This splendid bird is frequently met with in old aban- 

 doned farms. 



Iris and orbit red , bill black , paler at the base of the 

 lower mandible , feet lead-color. 



Treron calva. 



Columba calva , Temm. & Knip , Pig. p. 35 , pi. 7. 



Treron crassirostris , calva et nudirostris ^ Hartl. Orn. W. 

 Afr. p. 192. 



Treron calva et nudirostris , Schl. Mus. P.-B., Columbae , 

 p. 46 and 47. 



Treron calva, Boc. Orn. d'Ang. p. 379; — Shelley, 

 Ibis 1883, p. 267. 



Hab. Western and Eastern tropical Africa. 



Collected at Sofore Place and near the Fisherman Lake. 



The late Prof. Schlegel based his both above cited spe- 

 cies upon a slight difference in color and size, without 

 attaching any importance to the more or less bare front 

 in the different specimens. My Liberian specimens now seem 

 to form a link between both species, being similar to 

 7\ nudirostris in color and to the larger T. calva in size , 

 and so 1 fully agree with Capt. Shelley, who unites 

 all three above mentioned species under the name of calva. 



These birds seem to live in pairs in the vast forest-regions 

 of the Interior during their breeding season, but after- 

 wards they appear in large flocks together in the coast 

 region, where they feed for a great part upon the buds 

 of the Mangrove. 



On that reason the Liberians call it the Mangrove Pi- 

 geon. Excepting the domestic fowl this is the only bird 

 which is sold and used for food in Monrovia. 



Iris blue , surrounded by a rose-colored rim , base of bill 

 coral-red, tip bluish horn-color, feet yellow. 



Columba unicincta (Plate 6). 



Columha unicincta, Cass. Proc. Acad. Nat. Sc. Philad. 

 1859, p. 143; — Shelley, Ibis 1883, p. 277. 



Notes from the ILieyden IMuseum, 'Vol. "VXI. 



