IQ William Morton Wheeler. 



6. Neotropical: 

 Erebomyrma (1) 



B. Extinct Genera, 



1. Allied to paleotropi cal genera: 



Prionomyrmex (1), allied to Myrmecia 



Procerapachys (2), allied to Cerapachys and Lioponera 



Bradoponera (1), allied to Discothyrea and Spaniopone 



Electroponera (1), allied to Edatomma 



Nothomyrmica (4), allied to Tetramorium 



Stiphromyrmex (1), allied to Pristomyrmex 



Parameranoplus (1), allied to Meranoplus 



Enneamerus (1), allied to Myrmicaria 



Protaneuretus (1), allied to Aneuretus 



Paraneuretus (2), allied to Aneuretus 



Bhopalomyrmex (1), allied to Plagiolepis and Myrmelachista 



P t. dimorphomyrmex (1), allied to Dimorphomyrmex 



Olaphyromyrmex (1), allied to Formica 



Dryomyrmex (2), allied to Aphomomyrmex 



2. Of uncertain affinities: 



Electromyrmex (1) Asymphylomyrmex (1) 



Agrcecomyrmex (1) Pityomyrmex (1) 



Stigmomyrniex (1) 



It will be seen from this conspectus that all the Baltic amber 

 ants belong to genera which are either still restricted to the Old 

 "World or represented also in the nearctic and neotropical regions, 

 with the single exception of Erebomyrma. It must be stated, how- 

 ever, that this list does not bring out the fact that there is little 

 affinity with the African fauna, which is practically devoid of one 

 whole subfamily, the Dolichoderince, so highly developed in the amber, 

 and that the genera Sima, Monomorium, Plagiolepis and (Ecophylla, 

 though occurring in Africa, have even a stronger specific represen- 

 tation in the Indomalayan region. The genus Erebomyrma, at first 

 sight, points to a purely neotropical affinity, but further consideration 

 shows that this case admits of a very different explanation. This 

 genus was founded on a single Texan species {E. longi Wheeler), 

 to which Emery later added another from Peru (E. peruviana). The 

 occurrence of a species {E. antiqua Mayr) in the Baltic amber merely 

 shows that the genus was at one time cosmopolitan. Its affinities, 

 moreover, are closest to a group of Old World Solenopsidii (Aeromyrma, 



