PLATE 55 



if 



: 



Figs. 1-11. Advanced stages of the "guinea-mark'' in scapulars and coverts of a Juvenal (8 weeks) 



common pigeon. All from left side. All figures natural size. Hayashi del., 1907. 

 1, 2, 3. Superficial scapulars. 6. Fourth larger covert. 9, 10. Lesser covert. 



4. Posterior, deeper-lying scapular. 

 6. Third larger covert. 



7. Eighth larger covert. 



8. Thirteenth larger covert. 



11. J/>.^ser covert from oblique streak. 



Fig. 12. Long covert of adult female satinet! e dove. This satinette covert shows how the dark 

 center gives the foundation for the crescentic tips of these birds. Some scapulars show the 

 more advanced stages of transformation in which the tip is more perfect and the black lateral 

 margins are lost. 







