PREFACE TO THIRD EDITION. 11 



Order 13. Coraciiformes. [= Suborders Trogones, Alcyones and Striges, 



and Orders Macrochires and Pici.] 

 Suborder Coracise. [= Suborder Alcyones -f other (extra- 



limital) groups.] 



Suborder Striges. [= Suborder Striges of Raptores.] 

 " Caprimulgi. [= Suborder Caprimulgi.] 

 " Cypseli. [= Suborders Cypseli and Trochili.] 



Trogones. [= Suborder Trogones.] 

 " Pici. [= Order Pici + various extralimital fami- 

 lies in addition to the Woodpeckers.] 

 " 14. Passeriformes. [= Order Passeres.] 

 Suborder Passeres anisomyodi. 



Subclama tores. [Extralimital.] 

 Clamatores. [= Suborder Clamatores.] 

 " Passeres diacromyodi. 



Suboscines. [Extralimital.] 

 Oscines. [= Suborder Oscines.] 



It has been considered advisable to retain the present sequence 

 of the groups down to and including species. As many species have 

 been added, and some eliminated, since the publication of the original 

 edition of the Check-List in 1886, a new consecutive numbering of 

 the species would differ much from that hitherto in use. It has there- 

 fore seemed best to omit the serial numbering in the present edition, 

 giving the old numbers in brackets at the right of the name, as a 

 cross-reference or concordance to the previous editions and the later 

 Supplements. 



The geographical boundaries of the Check-List area remain as 

 heretofore. 



The principal changes in the construction of the new edition are 

 the following: 



1. The elimination of all species included in former editions exclusively on 

 the authority of Giraud as found in "Texas," except where their occurrence 

 within the Check-List limits has been confirmed. 



2. The secondary references under species and subspecies, and the concord- 

 ance to the previous check-lists (those of Baird, Coues, and Ridgway), are 

 omitted. 



3. The mention of the type species under genera is followed by a statement 

 of how the type was determined whether by monotypy, tautonymy, original 

 designation, or subsequent designation. 



4. The type localities of species and subspecies are given as indicated by 

 the original author. 



5. Generic, specific, and subspecific names are marked for accent. 



