OVARY—OVEN-BIRD 669 
lieved that they will apply to all the other species, about a 
dozen in number, which have been described. These inhabit 
suitable places throughout the whole Palsarctic area as well 
as the southern slopes of the Himalaya and the hill-country of 
Formosa, besides the Rocky Mountains and a great part of the 
Andes. Mr. Salvin, in a very philosophical paper on the genus 
(Ihis, 1867, pp. 109-122), refers these species—some of them 
wholly black and one slate-coloured—to five well-marked forms, of 
which the other members are either “representative species” or 
merely “local races”; but all seem to occupy distinct geographical 
areas,—the C. mexicanus represented in the accompanying figure 
having a wide range along the mountainous parts of North America 
to Mexico ; and it is quite possible that their number may yet be 
increased, for the general habits of the birds preclude much invasion 
of territory, and thus produce practical isolation. 
OVARY, OVIDUCT, see REPRODUCTIVE ORGANS. 
OVEN-BIRD, a name locally given to several species that build 
domed nests in England, especially to the Willow-WREN, and in 
Nesr OF OVEN-BIRD (Furnarius). 
(From specimen given to the Cambridge Museum by Mr. J. Young.) 
North America to Sturus auricapillus, otherwise known as the 
Golden-crowned Thrush; but by most ornithologists applied to 
birds of the genus Furnarius, belonging to the Neotropical Family 
Dendrocolaptide (PIcuUCULE), the best known of which is F. rufus, 
the Hornero (Baker) or Casera of the Spanish-speaking population. 
