Thirty-six hours. No. 30474 KU. Sheaths of primaries extend beyond the 

 down. 



Sixty hours. No. 30475 KU. Primaries 2-7 unsheathed at tips; greater 

 primary coverts unsheathed at tips; secondaries and their coverts still sheathed; 

 juvenal feathers of alula present and sheathed. 



Sixty-six hours. No. 30492 KU. No appreciable change from condition 

 at sixty hours. 



Eighty hours. No. 30476 KU. Lengths of first seven primaries 6, 9, 10, 

 9, 8, 6, 4 mm.; juvenal scapulars present and sheathed. 



Eighty-five hours. No. 30477 KU. Primary one unsheathed at tip; lengths 

 of primaries 9, 10, 10, 11, 12, 11, 7 mm.; greater coverts cover base of pri- 

 maries; lesser primary coverts present and beginning to unsheath; juvenal 

 feathers of alula unsheathed (visible in Plate 2, Figure b). 



Four days. No. 30479 KU. Lengths of primaries 9, 10, 10, 11, 11, 12, 10 

 mm.; secondaries unsheathed at tips. 



Six days. No. 30478 KU. Lengths of primaries 20, 22, 28, 28, 28, 26, 22 

 mm.; juvenal scapulars unsheathed at tips. 



Eight days. No. 30482 KU. Lengths of primaries 25, 30, 30, 32, 30, 27, 

 23 mm.; first juvenal feathers of sternal region present, sheathed; neither 

 juvenal scapulars nor sternal feathers yet visible through undisturbed down. 



Ten days. No. 34083 KU. Lengths of primaries 33, 36, 37, 38, 39, 33, 29, 

 11 mm.; primary eight present for first time; juvenal scapulars unsheathed at 

 tips; most advanced juvenal feathers of sternal region imsheathed at tips; 

 superior margins of sternal region and of femoral tract with quills of juvenal 

 feathers (visible in Plate 2, Figure c). 



Eleven days. No. 30484 KU. Lengths of primaries 38, 39, 40, 38, 40, 

 38, 33, 9 mm.; juvenal feathers of dorsal cervical region and of interscapular 

 region now present and sheathed: appearance of new juvenal feathers in 

 sternal region progressing ventrad. 



Thirteen days. No. 30485 KU. Lengths of primaries 50, 51, 52, 52, 49, 

 48, 40, 20 mm.; no appreciable change otherwise. 



Fifteen days. No. 30486 KU. Growth complete in juvenal primaries 1-3, 

 lengths as at 13 days, lengths of others 57, 54, 50, 46, 20 mm.; a few sheaths 

 of juvenal feathers on coronal region; in cervical region, sheaths of juvenal 

 feathers present from base of neck to posterior border of cervical apteria; 

 juvenal feathers of interscapular region unsheathed and concealing down; 

 sheaths of juvenal feathers of posterior dorsal region present, but hidden in 

 down; juvenal rectrices present and unsheathed, juvenal feathers of sternal 

 region in paired patches, the sheathed feathers meeting at midline (see Plate 2, 

 Figures c and d). 



Twenty-two days. No. 30487 KU. Lengths of primaries 48, 62, 60, 66, 

 71, 71, 65, 42 mm.; primaries 9-10 visible in flesh; a few unsheathed juvenal 

 feathers on midline of coronal region; juvenal auriculars present; juvenal 

 dorsal cervicals extend to above cervical apteria; juvenal feathers of posterior 

 dorsal region cover down; juvenal rectrices average 28 mm. long; juvenal 

 undertail-coverts equal rectrices; juvenal ventral cervicals ex-tend to below 

 cervical apteria; sternal region covered with juvenal feathers except at midline 

 (see Plate 2, Figure c). 



Twenty-nine days. No. 30488 KU. Juvenal primary 1 replaced; primary 

 one sheathed, 14 mm. long; lengths of primaries 2-10 are 60, 72, 82, 86, 90, 

 82, 68, 25, 13 mm.; coronal and occipital regions with juvenal feathers of 



[33] 



