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Annals of the Carnegie Museum. 



that such will eventually be discovered for the groups represented by 

 Odontophorus atrifrons and 0. variegdtus, ChamtBpetes, and Catharus 

 fuscater, and that such forms, when found, will- prove to be identical 

 with the Sierra Nevada form or else different' from either. It seems 

 to be the rule that where the forms of the Eastern Andes and Ven- 

 ezuelan Andes respectively differ from each other, the form of the 

 Sierra Nevada is either identical with that of the latter range or else 

 distinct from either. In several cases closely related or identical forms 

 inhabit the Venezuelan Andes and Sierra Nevada, without any repre- 

 sentative whatever in the Eastern Andes (see Figure 6), and with but 



Fig. 6. Discontinuous range of Aulacorhynchus calorhynchus, a Subtropical 

 Zone species found in the Venezuelan Andes and the Sierra Nevada de 

 Santa Marta. 



few exceptions the forms from the Venezuelan Andes and Sierra 

 Nevada respectively are more closely allied to each other than to the 

 form from the Eastern Andes. The inference to be drawn from these 



