Treron calva vylderi Gyldenstolpe, Bull. Brit. Ornith. Club, vol. XLIV, 5th. January 1924, p. 36.= Treron calvus vylderi Gyldenstolpe, 1924
Holotype ? : Male ad., Quevep, Kockarrahland, Great Namaqualand. 23. VIII. 1873. G. de Vylder leg. No. 16211. - Measurements of type : wing : 164 mm.; tail : 100 mm.; rhamphotheca : 10,5 mm.; bare portion of bill : 10 mm.Click on the picture for enlargement.