PREFACE TO THIRD EDITION. 11 
Order 13. Coraciiformes. [= Suborders Trogones, Alecyones and Striges, 
and Orders Macrochires and Pici.} 
Suborder Coracia#. [= Suborder Aleyones + other (extra- 
limital) groups.] 
Suborder Striges. [= Suborder Striges of Raptores.] 
“ Caprimulgi. [= Suborder Caprimulgi.] 
re Cypseli. [= Suborders Cypseli and Trochili.] 
” Trogones. [= Suborder Trogones.] 
SS Pici. [= Order Pici + various extralimital fami- 
lies in addition to the Woodpeckers.] 
«14. Passeriformes. [= Order Passeres.] 
Suborder Passeres anisomyodi. 
Subclamatores. [Extralimital.] 
Clamatores. [= Suborder Clamatores.] 
Passeres diacromyodi. 
Suboscines. [Extralimital.] 
Oscines. [= Suborder Oscines.] 
(zs 
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. 
