PLATE XVIII. 



Upper figure, egg of Passenger Pigeon. Lower figure, eggs of 

 Mourning Dove, commonly mistaken for those of Passenger Pigeon. 

 (Photograph by Prof. C. F. Hodge.) 



PLATE XIX. — PASSENGER PIGEON AND BIRDS COMMONLY 

 MISTAKEN FOR IT. 



Mounted specimen of Band-tailed Pigeon, left; Passenger Pigeon, center 

 and Mourning Dove, right. (Photograph by Prof. C. F. Hodge.) 



