THE DRIl'ER AND LEGIONARY ANTS. 253 



surface and the absence of some of the tarsal joints in all the various 

 dichthadiigynes of this genus that have come under the observation of 

 myrmecologists. 



Some recent observations indicate that certain species of Eciton 

 and Dorylns may have permanent nests and that their expeditions are 

 of two kinds, predatory and migratory. According to Vosseler (1905) 

 Anoinina inolcstiiin of German East Africa occupies the same nest till 

 it has destroyed all the available prey in a locality. This requires some 

 eight or ten days. Then the colony migrates to a new nest. He 

 observed one of these migrations which continued without interruption 

 for twenty-four hours. Santschi ( 1908 ) recently discovered under 

 an oven in a dye-shop in Tunis, a large Typhlopone fulvus nest from 

 which hundreds of males took flight about four o'clock in the afternoon 

 of six consecutive days. The dyer stated that he had observed this 

 flight at the same season for four years. " This indicates," as Santschi 

 remarks, " that even if the migrations of Dorylns are of general occur- 

 rence, they are not obligatory and that under certain circumstances 

 these ants may inhabit the same nest for long periods of time." 



The majority of species of Dorylns are undoubtedly carnivorous 

 or entomophagous, but Green (1900^) has shown that at least one 

 species, D. oricntalis of India, is herbivorous, that is, feeds on the bark 

 of trees and the tubers of plants such as the potato. 



The genus A^nictus comprises more than thirty species, the majority 

 of which are south Asiatic, whereas most of the species of Dorylns are 

 African. The workers of sEnictits (Fig. 143) have two joints in the 

 abdominal pedicel although the males and females have only one. 

 Wroughton and Forel (1890^) first identified the males of JEnictus 

 (Fig. 144) as belonging to workers that had been placed in the genus 

 Tvphlatta, so that this latter name had to be abandoned. More recently 

 Emery (1901/0 has described and figured the female of /. abcillei. 

 It differs from the dichthadiigynes of Dorylns in its smaller stature and 

 in having a very small, pointed pygidium. The genus .Enictogeton is 

 known only from a single male specimen from the Congo, on which 

 Emery (1901/1) founded the species fossiccps. 



The habits of ^Enictus have been observed by Wroughton (1892) 

 and Rrauns (1901). It is much less hypogzeic than Dorylns. Of an 

 undetermined Indian species Wroughton says : ' This is the only spe- 

 cies of worker I have ever met ; but it is far from uncommon in the 

 Dekhan. Notwithstanding the possession by the JEnictns worker 

 of two knots in the pedicel like the Myrmicidae, she is distinctly 

 ponerine in character and carries her booty exactly as do the Poneridae. 

 She has brought the military organization to perfection. Perhaps on 



