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



(A. Goeldi and Huber) . In 1912 he added Ps. latinoda var. endo- 

 phyta from the Rio Ariramba, near the Rio Trombetas, Ama- 

 zonas, basing the variety on specimens taken by A. Ducke in an 

 unidentified Tachigalia. Stitz in 1912 records two additional 

 ants taken by Ule in Tachigalia petioles : Ps. picta Stitz from Alto 

 Acre, Brazil, and Azteca brevicornis Mayr from Rio Branco, 

 Sierra de Maivasy, Brazil. I have been unable to find any other 

 records of Tachigalia ants in the literature. Strangely enough, 

 none of the five forms cited above occurs in the trees at Kartabo, 

 but instead, the following forms, 28 in number, half of them 

 belonging to new species, subspecies and varieties. I have no 

 doubt that I could have greatly increased the number of species, 

 had I been able to examine Tachigalias in other parts of British 

 Guiana, or even in the Bartica District, had I been able to pro- 

 long my stay. 



Subfamily Ponerin^. 

 1. — Ectatomma tubercidatum (Oliver). 



This large, rather sluggish, yellow-brown ant, the well- 

 known "kelep," which Dr. 0. F. Cook several years ago attempted 

 to introduce into Texas from Guatemala for the purpose of prey- 

 ing on the cotton-boll weevil, was occasionally seen resting on the 

 terminal shoots of young Tachigalias along the Puruni trail at 

 Kartabo. It evidently feeds on the honey-dew of the Membracids, 

 but more frequently it visits other plants, and especially the con- 

 spicuous saucer-shaped nectaries on the petioles at the junction 

 of the leaflets of various species of Inga. 



2. — Neoponera unidentata (Mayr) . 



A single dealated female founding a colony in a Tachigalia 

 petiole. This species nests normally in the hollow twigs of vari- 

 ous other trees. 



3. — Neoponera crenata (Roger) . 



A single dealated female founding a colony in a Tachigalia 

 petiole. This species nests in the hollow twigs of other trees. 

 It is very common at Kartabo. 



