JtiteVifiwS. il3 



ihUchoderinae ... 7 ... 20 ... 7508 



Ciuuponotinae ... 13 ... 32 ... 3827 



This is about the proportion of species in the different subfamilies 

 one might expect from any tropical or subtropical region as large as 

 that of the Baltic amber, though not of course of the individual repre- 

 sentation. The much larger number of specimens in the Dolichoderinae 

 and Caiiijxmotinae is chiefly accounted for by the presence in the former 

 of 5428 individals of one species — Iridoiinjrme.c (joepperti Mayr, and 

 1289 of another — I. geinitzi Mayr ; and in the latter, of 1310 indi- 

 viduals of Formica fiori Mayr, and 1172 of Lasiiis sckiefferdeckeri Mayr, 

 Of course however the highly arboreal habits of these two subfamilies 

 would render them more liable to be trapped in the liquid resin. The 

 entire absence of some very tree-frequenting genera, such as Cremasto- 

 (jaster in the Myrmicinae, etc., can only be accounted for by the sup- 

 position that they never invaded the Baltic region, and not to the 

 selective action of the resin, as they must certainly have existed as far 

 back as the Lower Oligocene. 



The fact that not a single member of the whole subfamily Doryllnae 

 has been found in the amber can only be explained in the same way. 

 They are nearly as primitive as the most primitive subfamily — the 

 Ponerinae, and though they are chiefly terrestrial in their habits, still 

 specimens of recent Dori/Unae have been found in the Zanzibar copal. 



In comparing the genera found in the amber with those of the 

 recent ants, we learn that 19 belong to extinct genera, and 24 are still 

 extant. These are as follows : — 



Extant Genera. 



1. Cosmopolitan : 



Ponera, 2. Prenolepis, 2. 



Aphaenogafiter, B. Cmiiponotus, 1. 



2. Tropicopolitan : 



Platythyrea, 1. Iridouii/rmex, 5. 



Kuponera (Trachyiitesopus), 1. Dolichuderits (Hypocli)iea), 9. 



3. Paleotropical : 



Siina, 6. Playiolepi'i, 6. 



MonumoruDit, 2. Oecophylla, 2. 



4. Indomalayan and Australian : 



p]ctatoiiia [Khytidoponera) , 1. Dirnorphomyrmea!, 2. 



VollenJwvia, 2. Pseudolasius, 1. 



(j-eso)iiyrnie.r, 2. 



5. Circumpolar : 



Stenamma, 1. Liometopuin, 1, 



Myrmica, 1. Lasiiis, 6. | 



Leptothara.r, 6. Formica, 6. 



.6. Neotropical : 



Ereboniyrma, 1. 



Extinct Genera. 



1 . Allied to paleotropical genera : 



Prionoiiiyrme.v, 1, allied to Myrniecia. 

 Procerapachys, 2, allied to Cerapachys and Lioponera. 

 Bradnponera, 1, allied io Biwothyrea and Spaniopone. 



