O VAR YO VEN-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 Palsearctic area as well 

 as the southern slopes of the Himalaya and the hill-country of 

 Formosa, besides the Kocky Mountains and a great part of the 

 Andes. Mr. Salvin, in a very philosophical paper on the genus 

 (Ibis, 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 0. 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 



NEST OF OVEN-BIRD (Furnarius). 

 (From specimen given to the Cambridge Museum by Mr. J. Young.) 



North America to Siurus auricapillus, otherwise known as the 

 Golden-crowned Thrush; but by most ornithologists applied to 

 birds of the genus Furnarius, belonging to the Neotropical Family 

 2kndrocolaptid& (PICUCULE), the best known of which is F. rufus, 



the Hornero (Baker) or Casera of the Spanish-speaking population. 



