MOUNTAIN ANTS OF NORTH AMERICA. 



489 



the Ponerinae, and several Myrmicine genera to the Mesozoic, and 

 many DoHchoderinae and Camponotinae to the early Tertiary. 

 Kolbe (1913), however, comes still closer to my point of view in a very 

 suggestive study of the distribution of certain ancient genera of 

 Coleoptera, an order which can scarcely be much older than tlic 

 Hymenoptera. He calls attention to the fact that if we compare the 

 beetles of Australia and Europe we find that they possess no less than 

 146 genfera in common, and that owing to the fact that Australia 

 was isolated during the Eocene we are justified in regarding all such 

 genera as of Mesozoic age. I believe that the same conclusion is 

 admissible in the case of other insects and especially in regard to the 

 ants and would hold good also of the genera common to Australia and 

 America. In the following list, including all the known genera of 

 Australian ants, the genera printed in large type are represented also 

 in the Neotropical and Nearctic faunas and those preceded by an 

 asterisk occurred in the Tertiary of Europe or are represented in the 

 living fauna of that continent: 



SPHINCTOMYRMEX 

 *CERAPACHYS 



Phyracaces 



Myrmecia 



Amblyopone 

 *PLATYTHYREA 



ACANTHOPONERA 



Onychomyrmex 



Paranoraopone 



Diacamma 

 *ECTATOMMA 



Bothroponera 



Odontopoaera 

 *EUPONERA 

 *PONERA 



Dorylozelus 



Prodiscothyrea 



Prionogenys 



LEPTOGENYS 

 *ANOCHETUS 



ODONTOMACHUS 



Aenictus 



Metapone 



*Sima 

 *01igomyrmex 



Pheidologeton 

 *CREMATOG ASTER 

 *SOLENOPSIS 

 *PHEIDOLE 



Lordomyrma 

 *Vollenhovia 

 *Podomvrma 

 *MYRMECIXA 



Machomyrma 



Dacryon 



*MONOMORIUM 

 *CARDIOCONDYLA 

 *APHAENOG ASTER 

 *TETRAMORIUM 



Pristomyrmex 



Triglyphothrix 



Mayriella 



ROGERIA 



Prodicroaspis 



Promeranoplus 



Meranoplus 



