XXIV Birds of Colorado 
EXPLANATIONS. 
The nomenclature and classification used are almost 
without exception that of the recently published third 
edition of the A.O.U. Checklist. It was not, therefore, 
thought necessary to give original references to descrip- 
tions of species and genera. Measurements are all stated 
in inches and decimals of an inch. A list of the local 
references to Colorado ornithological writings is given 
with every species, under the author’s name and date of 
his publication. For the complete reference the Biblio- 
graphy on pages 533—51 should be consulted. 
