SK\-I.I\HTI:I) III;IM DITY IX CERTAIN CKOSSKS. 159 



this period is. immediately preceded and followed by a predominance of light- 

 colored offspring; while in both the preceding and succeeding spring-time there is a 

 period in which dark color predominates. In the second mating with alba, the 

 very first and last eggs of the two seasons show infertility (3 cases) or light color 

 (1 case). The more infertile period here, houcver, would seem to be May or June. 

 In this last mating the first egg showed greater developmental capacity in 5 cases, 

 less in none. In the earlier cross with ullxi, '2 cases followed the rule and there were 

 2 exceptions; both of these latter, however, were found in the first clutches of the 

 two seasons embraced by the mating period. The earlier matings of this series- 

 pure risoria and suratcnsis females show lirst eggs of pairs as more fertile in 3 

 cases, less fertile in 1 case. Two further illustrations of and no exceptions to this 

 rule are given by another M. allxi female whose record is placed in table -154. 



The bearing of season and fertility upon the dominance of light or dark color 

 may be further noted by reference to the first part of table 154. It will there be 



TABLE 154. 



u 1 :i II in i is. x ris. -alba X surateii. XX alba liyb. (T 1); 5/1/03; pale risoria (see pi. 

 9 humilis -risona hyli. 1.0 2); * 7, 111 ; '.I 7, (>".; 49 in...; darker than above. 



d 1 A 1. 0/21/04 . . . .Til 1 color dark; fertile with risoria (1 pale, and 1 dark d" offspring). 



A 2. 6/23/04 . . . .TH 2 dark; toward humilis. 



B 1. 7/10; complexion and down indicated dark color like A 1 and A 2; dead (out of nest) at 3 days. 

 B 2. 7/12; very small to be white! dead (out of nest) at about 1 to 2 days. 



C 1. 8/2 TH 3 complexion and down dart, like humilis. 



C 2. 8/4; color white! dead (out of nest) at about 10 days. 



D 1. 8/30; small white! died (lice) at 1 day. 



D 2. 9/1; larger light grayish brown; toward earlier darker young; dead at 18 daya. 



10 1. 9/27; no development. 



E2. 9/29 TH4 color white ! 



F 1. 10/31 TH 5 liyht pale risoria; dead "autumn 1904." 



F 2. 11/2; no development. 



G 3/14/05; color to bo white! dead (thrown from neat) at 1 day. 



cfH 1. 4/4 TH6 .dark; toward humilis and surateimin (fertile w. alba); 8/14/08 41) in.,. 



C? II 2. 4/0 Til 7 dark, suratcnsis streaks less strong than TH (see pi. 20); matured (Q 8 



tf TH above alba ris. X ris alba X jurat, XX alba XXX hum.-ria. (hyb.) ; 4/4/05; 8/14/08; 40 mo. ; dark. 

 9 St. alba; from dealer I'.IOO; white. 

 cT A. 5/15/00. . . .THO-A color dark, near douraca ' dead 2/12/08 21 mo. 



B '' 9''7l onc developed to hatching, failed; light down, and complexion of risoria; one, no development. 



C 1 . 4/0/07 TH G-C risoria-like, w. trace reddish (of humilis) ; dead 12/0/07 . . 8 mo. 



C 2. 4/8/07; no development. 



D 1. 2/5/08 THO-D pale light risoria 12 S (>:> 22 mo. 



D 2. 2/7/08; developed to hatching, failed; complexion liaht risoria-like. 



E 1. 3/7/08; no development (lack of care of cf ? and cold ?). 

 E 2. 3/9/08; no development (lack of care of d* ? and cold ?). 



c? TH 0-A above. 5/15/00; 2/12/08 (tuberculosis) ; 21 mo.; dark. 

 9 9 St. alba (l);'from dealer 1900; white. 



9 A. 9/15/07 THO-A-A. . . .u-hite; fertile alive 4/14/09 1!)+ mo. 



(G 8, DD) 



1 Japanese rin^s and blond rings had access to the nest of this pair. It was at first thought that a douraca may have 

 left there the egg that hatched this bird; but this consideration was later overruled. EOITOK. 



