218 



INHERITANCE, FERTILITY, AND SEX IN PIGEONS. 



TEXT-FIGURE 9. 



1. Neck-mark of a Juvenal St. rixoria ($)-humili$ (J-) hybrid (K). Hatched July 11, 1902; age 4 weeks. 



Natural size. Hayashi del., Aug., 1902. 



Sire, pure St. risoria (3); dam, St. hiimilis x risoria (B 2). The feathers here are more closed, or 

 cramped together, than seen in the flat view (2). 



'2. Neck-mark (flat) of St. nsoria-humilis hybrid (K); same as above. Natural size. Hayashi del., 



Aug. 1902. 



This mark may be compared with that of the Juvenal (7 \yeeks) St. kuinilix seen in color in pi. 21, 

 fig. B. There may be u lagging development of color in this hybrid as compared with that in the very dark 

 humilis; the rate is probably nearer that of the ring-dove, since the hybrid is three-fourths risoria; compare 

 also with fig. B, pi. 31. 



3. Neck-mark of an adult male St. risoria (1) X T. orientalis (13) hybrid (SO 1). Hatched May 9, 1904; 



alive Jan. 1915. Three-fourths natural size. Toda del., April 10, 1905. 



This bird is shown in color, pi. 12. The position of the neck-mark is considerably influenced by the 

 T. orientalix parent. Other details are better seen in the flat view presented in 4. 



4. Neck-mark (flat) of the same hybrid as in 3 above. 



The marks are somewhat smaller than in the Japanese parent; this is toward the ring-dove. The 

 extent of the white on the feather-tips bears a similar relation to the parents. 



Several accessory plumes are present within the neck-mark. 



The outer portion of the second (lower) row of the left mark is divided into two rows. The division 

 stops at about the middle of the row. 



