162 Zoologica: N. Y. Zoological Society [HI; 4 



Described from several workers and a female taken from a 

 single colony nesting in a Tachigalia petiole at the Penal Settle- 

 ment, near Bartica, August 10. 



This species, though related to L. tristani Emery of Costa 

 Rica, appears to be distinct both from it and the various forms 

 of ecJiinatinodis Forel in the structure of the clypeus, and petiole, 

 in sculpture and coloration. 



19. — Allomei-us octoarticulatus Mayr. 



Of this extraordinary little ant a single small colony with 

 pupse was found in a young Tachigalia on the Puruni trail at 

 Kartabo. This I believe to be a very exceptional occurrence, 

 since the species is the most typical and abundant tenant of 

 another myrmecophyte, Cordia nodosa, so that I shall de- 

 scribe its peculiar habits in another publication in connection 

 with the other ants which inhabit the stem-swellings of that plant 

 and go to make up what may be called the "Cordia biocoenose." 



20. — Atta cephalotes L. 



I include this well-known leaf-cutting ant in the Tachigalia 

 biocoenose, because on one occasion I found that it had completely 

 defoliated some of the young Tachigalias growing near the Penal 

 Settlement. The petioles of these plants were either empty or 

 contained recently fecundated Pseudomyrma damnosa queens 

 that had only begun to lay eggs, so that the plants were quite 

 unprotected. 



Subfamily Dolichoderin^. 

 21. — Dolichoderus attelaboides Fabr. 



Workers of this singular ant were occasionally seen attend- 

 ing Membracids on the shoots of young Tachigalias growing 

 along the Puruni trail, at Kartabo. The ant is more common in 

 attendance on Membracids feeding on the terminal shoots of 

 various Melastomacese. 



