CROSSES AND FERTILITY OF WILD SPECIES OF PIGEONS. 



13 



It is also well to note in the list the frequency of hermaphroditism and the entire 

 absence of gonads in hybrids from " wide " crosses. The author has little noted this 

 matter; but the autopsies of some hundreds of his hybrids, made by the editor, and 

 the complete summaries of all of the records demonstrate, in the opinion of the 

 editor, that hermaphrodites are far more frequent in the offspring from wide crosses 

 and from hybrid parents than from intra-specific and pure-bred matings. 



In order to facilitate the consultation of the complete breeding record, in con- 

 nection with an examination of the data for sex and fertility, as summarized in 

 this chapter, a list of table references (p. 12) has been prepared. The numbers in the 

 left-hand columns of that list correspond to the number of the cross (in the pre- 



Indivifliial malings testing absolutely infertile. 



Width of No. of eggs Reference to 

 tested. original MSS. 



Orientalis (19) X gyrans (1903) . . . . 



Orientalis (1) X gyrans (1) 



Orientalis X domestica (blai-k) . , . 

 Domestica-orientalis (F2) ,\ .Imm.s 

 Domestica-orientalis (F2) ;% livia 

 Domestica-orientalis (Al) X g.\ian! 



Admista-orien talis X gyrans 



Domestica-orientalis X domestica . . 



Orientalis X riaoria-orientalis 



Risoria-orientalis-orientalis 



Orientalis-risoria (6) X alba-risoria 

 Alba-orientalis (3) X alba-orientali: 



Ocyphaps X risoria 



Risoria X Ocyphaps 



Risoria (Ml) X Ocyphaps. 



< turtur (D7) . 

 (5) 



Risoria (Ml) X Ectopistes (III-B) (do not know No. eggs). 



Risoria (Ml) X gyrans (T5) 



(This c? (Ml), however, only partially fert. 



Risoria X gyrans (T5) 



Risoria (GF2) X gyrans (1) 



Risoria (2) X carolinensis 



Risoria X chinensis 



Risoria (A) X chinensis (T.c.) 



Chinensis X risoria 



I alba X ris. hyb.) 



Domestica X palumbus 



Tumbler (T6) X maculosa (? trace of dev. in 1) . 



Turbata X risoria (F)— (1, 1 to 2 da. emb.) 



Illyrica (Arl) X alba (W2) 



lUyrica (Arl) X risoria-alba 



Tabellaria (Horn. 2) X risoria (LI) 



1 1- ,.f 1.S99). 



cf Risoria-alba X G. humeralis. . 

 Risoria-alba (ZD201) X gyrans. . 

 Domestica-risoria X alba (W) . . . 

 Risoria-douraca X Geotrygon . . . 



Carolinensis X alba 



CarolinensLs-risoria (CI) >' ii>i>ii 



Carolinensis X alba-risoria i X W L' ( ' _' i 



Carolinensis X alba-ris X ii-.-all)a (-\--( )) 



Carol-ris XX alb-ris X ris-alb X alb-ris X ris-a 



Migratorius-risoria X alba-ris X ris-alba 



Domestica-risoria X archangel-tumbler 



Alba-ris X ris-alba X carolinensis (2, El) 



Alba-ris X ris-alba X domes-ris X gyrans (T4) . 



Alba-risoria X risoria-alba X carolinensis 



Alba-risoria X risoria-alba X carolinensis 



Alba-ris X ris-alba X tigrina X X ris-alba 



Fam. 

 Fam. 

 Fam. 



Subfam. 

 Subfam. 

 Subfam. 

 Subfam. 



Fam. 



Fam. 



Fam. 



Fam. 



Subfam. 



Gen. 

 Gen. 

 Gen. 



Fam. 



Fam. 

 Fam. 



Subfam. 

 Subfam. 



Subfam. 

 Subfam. 



C7/6 



F26 



F24 



G IS 



A 13 



F14 



F18 



F18 



F9 



C 7/4G 



Xll 



X9 



I!B5 



DD 13 

 X4 

 DD 13 



C 7/46 

 C 7/28 

 C7/28 

 C7/3 

 C 7/12 

 G19 

 C 7/39 

 XX8 



C7/7 

 C7/47 

 C7/47 

 C 7/47 

 C7/47 

 Sh 32/13 

 C 7/35 

 C7/23 

 C 7/47 

 X7 

 C 7/21 

 DD 17 



