1775 Ash, *Orniscopics, the omens or predictions drawn from the observation of birds. 
1755 Johnson, *Orniscopist, one who examines the flight of birds, in order to foretel futurity. 
1775 in Ash. 
1828 in Webster, and in some mod. Dicts.
1890 Century Dict. ,*Orniscopy, same as ornithoscopy.