224 INHERITANCE, FERTILITY, AND SEX IN PIGEONS. 



Explanation of Plate 37. 



A. Adult msde Streptopelia alba-risoria xTurtur turtur hybrid. (J 1). Hatched May 15, 1901; age 



10 months. Six-tenths natural size. Hayashi del., March 1902. 

 Sire: St. aWa-risoria x St. risoria-alba (D2). Dam: T. turtur (TI-B 1). 

 Note the intermediate neck-mark and the reduced dark centers of the general pUmiage. 



B. Adult male ring-dove (f) x common turtle-dove {\) hybrid (A 1). Age 10 months. Six-tenths 



natural size. Hayashi del., March 1902. 



Sire: St. risoria (i'j-alba (|). X T. turtur (|) hybrid (D 1); a brother to hybrid drawn in color, pi. 38, fig. B. 

 Dam: St. risoria (7). 



The neck-mark and dark centers of feathers reduced a second time from the T. turtur characters by crossing 

 with ring-doves. 



This male fertile with a Streplopdin ri.'ioria-nWa (J) — .S7. humili.i hybrid. 



Explanation of Plate 38. 



A. Adult female complex Streptopelia X T. turtur hybrid (D 9). Hatched Aug. 10, 1904. Six-tenths 



natural size. Hayashi del., April 1907. 

 Sire: St. alba-risoria x St. risoria-alba X T. turtur (D 1). Dam: St. alba (O). 



The neck-mark approximates to that of the ring-dove. The color of the general plumage of the sire is here much 

 reduced. 



B. Adult female complex Streptopelia (-|) x T. turtur (i) hybrid (E 1). Hatched Aug. 18, 1901; 



age 7 months. Six-tenths natural size. Hayashi del., March 1902. 



Sire: St. alba-risoria x St. risoria-atbaX T. turtur (D 1). Dam: St. risoria (7). 



Sister to male (A 1) of pi. ,37 B. Color dark. 



The neck-ring here is continuous, but narrow in the back. It includes 5 rows of feathers; 3 rows make most of 

 the ring (shown flat in pi. 39, fig. 4). This neck-mark comes nearer the ring-dove type than does the ring of the clutch- 

 mate brother (E 2) whose neck-mark is shown in pi. 39, fig. 3. 



C. Juvenal male complex Streptopelia (f) x T. turtur {\) hybrid (H 2). Hatched Feb. 4, 1902; 



age 8 weeks, 3 days. X 1. Hayashi del., April 1902. 



Sire: St. alba-risoria x St. risoria-alba x T. turtur (D 1). Dam: St. risoria (7). 



In general appearance the ring-dove characteristics clearly predominate. Some influence of turtur is still seen 

 in the shape and position of the neck-mark and in the light edge of the feathers that fonn it. Compare the neck- 

 marks of a sister, fig. B, and pi. 39, fig. 4; of an adult brother, pi. 37, fig. A; and juvenal ring-dove pi. 31, figs. A, B, C; 

 also with brother to sire, text-fig. 11. 



Explanation of Plate 39. 



1 Neck-marl: of juvenal male complex Streptopelia (f) X T. turtur {{-) hybrid (I). Hatched 

 July 14, i902; age 47 days. X 0.6. Hayashi del., Aug. 1902. 



Sire: St. alba-risoria x St. risoria-alba X T. turtur (G). Dam: St. risoria (6). 



Compare flat view of both sides of neck in fig. 2. Note that feathers of the neck-mark are all edged with whitish- 

 gray, after tlie turtle-dove pattern. In localization and in the form of the mark the influence of turtur is also evident. 



2. Neck-mark (flat) of same bird as fig. 1. Age 47 days. X 2. Hayashi del., Aug. 1902. 



The feathers are very distinctly edged with whitish-gray. The marks do not form a continuous ring behind, 

 but this condition is approached much more strongly than in T. turtur. 



3. Neck-mark of adult male complex Streptopelia (|) X T. turtur {\) hybrid (E 2) ; brotlier to 



female of fig. 4 below. Hatched Aug. 19, 1901 ; age 7 months. X 2. Hayashi del., March 



1902. 



This ring is broken in middle of back of neck; two elongated side-patches of black bordered above and below 



with white or whitish feathers. Ring of 5 rows of feathers, but 3 rows and a little of an upper row make up all that 



is seen. There is a lower row entirely out of sight; on the left, one feather of this row is pulled out far enough to show 



the dusky gray inner web. Note that the inner web of this feather is shorter than the outer. 



More black is shown in the figure at middle of the back than is seen in nature, the feathers being turned to show 

 the black. As the neck is generally held by the bird, the black here is concealed. 

 The black feathers are in greater number on the right side. 



4. Neck-mark of adult female complex Streptopelia (f) XT', turtur {]) hybrid (El). Hatched 



Aug. 18, 1901 ; age 9 months. X 2. Hayashi del., May 1902. 

 The ring is continuous but narrow in the back. Five rows of feathers; three rows from the main part. A few 

 feathers inside the ring-area show the white tip of the T. turtur grand-parent, but these are perhaps less evident than 

 in the brother shown in fig. 3 above. 



