AN AMERICAN CERAPACHYS. 185 



Tribe 2. Cerapacliyi (Africa, Asia, Australasia and Texas !). 



Genus Cerapachys Smith (antennae with a one-jointed club). 



Subgenus Cerapachys (antennas 12-jointed). 



Subgenus Parasyscia Emery (antennas n -jointed). 



Subgenus Oocercea Roger (antennae lO-jointed). 



Subgenus Syscia Roger (antennae Q-jointed ; first gastric seg- 

 ment but little longer than the postpetiole). 



Subgenus Cysias Emery (antennae Q-jointed ; first gastric seg- 

 ment much longer than the postpetiole). 



Genus Phyracaccs Emery (terminal antennal joint not forming 

 a club Madagascar, Africa, Borneo). 



Genus Lioponera Mayr (23 terminal joints of antenna forming 

 a club India, Sumatra). 



Genus Sphinctomyrmex Mayr (abdomen constricted behind 

 each segment Brazil). 



Tribe j. Cylindromyrmii, 



Genus Cylindromyrmex Mayr (antennae 12-jointed; South 

 America). 



Genus Siinopone Forel (antennae 11 -jointed; Madagascar). 



The occurrence in America of a representative of the largest 

 and most diversified genus of the Cerapachyinae is of some inter- 

 est in view of the fact that this group is the most archaic and 

 generalized of existing Formicidae. It is, in fact, the group from 

 which Emery and Forel would derive both the Dorylinae and 

 Ponerinae, themselves very primitive subfamilies of ants. Inas- 

 much as the three remaining subfamilies (Myrmicinae, Dolicho- 

 derinae and Camponotinae) are derivable from Ponerine forms, it 

 is evident that the Cerapachyinae must constitute a group of high 

 phyletic significance. Emery ('95) has even gone a step further 

 and pointed out the close resemblance of the Cerapachyi to the 

 Mutillidae, especially to forms like Apterogyna, which have a 

 very ant-like pedicel to the abdomen and resemble the ants in 

 many other particulars. I have copied his figure of Apterogyna 

 (Fig. 5) for the sake of showing the close resemblance of this 

 primitive Mutillid to certain species of Cerapachys ', e. g., C. 

 peringueyi (Fig. 3). 



While Emery and Forel agree in regarding the Cerapachyinae 

 as the most primitive of Formicidae, they hold very different 



