PREFACE. vii 



" 4. That any subsequent additions to the list be interpolated in 

 systematic order, and bear the number of the species immediately 

 preceding, with the addition of a figure (i, 2, etc., as the case may 

 require), separated from the original number by a period or decimal 

 point, thus giving the interpolated number a decimal form {e. ^., 

 243.1, etc.), in order that the original numbers may be permanent. 



" 6. That Giraud's at present unconfirmed species of Texan birds 

 be included in the List on Giraud's authority. 



" 7. That species and subspecies the zoological status of which 

 cannot be satisfactorily determined, like, e. g., Regulus cuvieri and 

 Spiza townsendi of Audubon, be referred to a hypothetical list, in 

 each case with a brief statement of the reasons for such allocation. 



*' 8. That a list of the fossil species of North American birds be 

 added as an Appendix to the List proper. 



"9. That the names of subgeneric and supergeneric groups of 

 North American birds be included in the List in systematic order, 

 to the end that the List may represent a classification as well as a 

 nomenclature of the birds. 



" 10. That references be given to the original description of the 

 species, and to the publication where the name as adopted in the 

 List was first used ; that the number borne by each species and sub- 

 species in the Lists of Baird, 1858, of Coues, 1873, of Ridgway, 

 1880, and of Coues, 1882, be bracketed in chronological order after 

 the synonymatic references. 



"11. That a summary statement of the habitat of each species 

 and subspecies, with special reference to its North American range, 

 be included in the List. 



"12. That the name of each bird shall consist of its generic 

 without its subgeneric name, and of its specific with its subspecific 

 name, if it have one, without the intervention of any other term. 



" 1 4. That every technical name be followed by a vernacular name, 

 selected with due regard to its desirability. 



"15. That the name of each species and subspecies be followed 

 by the name of the original describer of the same, to be enclosed in 

 parentheses when it is not also the authority for the name adopted. 



