PLATE 55 



9 



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. 7. Eighth larger covert. 11. Lesser covert from oblique streak. 



6. Third larger covert. 8. Thirteenth larger covert. 



Fig. 12. Long covert of adult female eatinette 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 . 



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