filled, at least without causing much delay in the publication of the 

 work, thus leaving a few of the descriptions incomplete. 



It is to be noted that the Supplement contains many changes in 

 generic nomenclature from that of the original Check-List, many 

 groups treated in the latter as subgenera being here given the rank of 

 genera, while the changes in generic names shown to be necessary 

 since the publication of the Check-List are duly recorded in the 

 present supplement. 



J. A. ALLEN. 



American Museum of Natural History. 

 January 8, 1917. 



iv 



