POSS1L AXTS. 



171 



of SvspJiincta, Proceratium and Discothyrea. I have also found in the 

 Prussian amber two new Ponerine genera related to the Indian Dia- 

 caiiniia and Lioponcra. 



2. Mvnniciiuc. Of this subfamily there are several genera which 

 show a wide range of organization and specialization in both the Baltic 

 and Sicilian ambers. Hypopomyrmex bombiccii (Fig. 96), a singular 

 ant described by Emery from the latter formation, although possessing 

 lo-jointed antennae and a well-developed venation in the wings, seems 

 to represent a generalized type from which the modern Dacetonii may 

 have sprung. In the Baltic amber Stigmomyrmex (Fig. 95), with 10- 

 jointed, and Enneamerus with only 9-jointed antennae, are remarkable- 

 forms. The latter, except in the small number of antennal joints, resem- 

 bles the paleotropical Pristomyrmex, Several species referred by Mayr 



P. 



FIG. 99. (Ecophylla brischkei, an 

 arboreal Camponotine ant from the Baltic 

 Amber. (Mayr.) 



FIG. 100. Worker of Gesomyrmex 

 htrrnesi, a large-eyed, arboreal Campono- 

 tine ant from the Baltic Amber. (Mayr.) 



to the genus Macromischa, because they lack spurs on the middle and 

 hind tibiae, do not belong to this genus, which is exclusively neotropical 

 and largely West Indian, but must be placed in a new genus, which 

 may be called Nothomyrmica. Much more like the true Macromischa 

 than any of Mayr's species, especially in the structure of the thorax 

 and petiole, is the extraordinary ant which I shall call Electromyrme.v 

 klebsi (Fig. 94). This and many other amber Myrmicinae are as 

 exquisitely sculptured as any of our modern species- Propodoniynna 

 (Fig. 93) from the Baltic and Acrostigma from the Sicilian amber are 

 related to the paleotropical Podomyrma and Atopomyrmex, but are 

 simpler and more primitive in their structure. 



3. DoHchoderincz. This subfamily is represented by a number of 



