10 
William Morton Wheeler. 
6. Neotropical: 
Erebomyrma (1) 
B. Extinct Genera • 
1. Allied to p aleo tropi 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 Ectatomma 
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 g dimorphomyrmex (1), allied to Dimorphomyrmex 
Glaphyromyrmex (1), allied to Formica 
Dryomyrmex (2), allied to Aphomomyrmex 
2. Of nncertain affinities: 
Electromyrmex (1) Asymphylomyrmex (1) 
Agrcßcomyrmex (1) Pityomyrmex (1) 
Stigmomyrmex (1) 
It will be seen from this conspectns 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 ( A'eromyrma , 
