(syn. Ptilopachus Ϯ Stone Partridge P. petrosus) L. petra rock, stone < Gr. πετρος petros stone; gallus cockerel; "PERDIX FUSCA, VIEILLOT. BROWN ROCK-PARTRIDGE. ... Perdix fusca, La perdrix brunne, Vieill., Gall. II. pl. ccxii. Petrogallus fuscus, Brown Rock-Partridge, Gray, Proceed. Zool. Soc. for 1836. Buff-breasted Partridge? Lath., Gen. Hist. VIII. p. 296, No. 30. MR GRAY had the drawing of this partridge for the accompanying plate [XVI], made from the specimens in the British Museum, which he has named and characterized in the Proceedings of the Zoological Society as the Brown Rock-Partridge, Petrogallus fuscus. In a new arrangement of the gallinaceous birds which this gentleman has been for some time preparing, this bird is considered as the type of a new genus ("Petrogallus," Gray)" (Jardine & Selby 1837).