Fig. 21. A probable ceise of Hybridism. 



1. Range of Rampkocelus icteronolus. 



d. Range of Ramphocelus chrysonotus and intergrades between Nos. 1 and 3. 



3. Range of Ramphocelus Jlammigerus. 

 Nos. 1 and 2 are believed to intergrade by hybridization, producing No. 3. 



611 



