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was more fortunate in Costa Rica. He sent Emery the following 

 species taken from the thorns of such trees : Ps. gracilis var. 

 mexicana Roger, Ps. nigropilosa Emery, Ps. kiinckeli Emery, 

 Crematogaster hrevispinosa Mayr, Cryptocerus miniitus P., 

 Cryptocerus sp. (near discocephalits F. Sm.), Camponotus rectangu- 

 laris Emery and Colobopsis sp. All or nearly all of these occur 

 in the hollow branches of a great variety of trees and shrubs. 



By way of summar\' I subjoin a list, with localities, compiled 

 from the literature and my collection, of the ten species which are 

 known to occur in the living acacias. 



Pseudomyrma belli Emery. 



Costa Rica : Alajuela, Jimenez, Liberia (A. Alearo) ; Santa 

 Cruz, Guanacaste (P. P. Calvert). 



Nicaragua : (W'm. Fluck) ; Grenada (C. F. Baker) ; Chon- 

 tales (FoREL in Biol. Cent. A nier.). 



Guatemala : Escuintla (\V. M. Wheeler). 



Mexico : Manzanilla, Colima (C. H. T.Townsend) ; Escuinapa, 

 Sinaloa (J. H. Batty) ; Acapulco (C. F. Baker) ; Orizaba (H. 

 de Saussure). 



Ps. belti fulvescens Emery. 



Colombia : Sabanilla (C. Gagzo). 



Nicaragua : Grenada (C. F. Baker). 



Guatemala : Zacapa, Ouirigua, Escuintla. Patulul (\V. M, 

 Wheeler) ; Champerico (Fred. Knab). 



Mexico : Santa Lucrecia, Vera Cruz (Fred. Knab) ; Cor- 

 doba (Fred. Knab) ; Los Cocos, Vera Cruz (A. Petrunke- 

 witch) ; Jalapa (Rangel) ; Tampico (H. Jourdan) ; Torola, 

 Chiapas (A. Petrunkewitch). 



Ps. spinicola Emery. 



Panama : Las Sabanas (W. M. Wheeler). 



Costa Rica : Alajuela, Jimenez, Pozo Azul (A. Alfaro) ; 

 Subures near San Mateo. 



Nicaragua : Chontales (J.anson). 



British Homiuras : Belize and Manatee (J. D. Johnson). 



Mexico: Teapa, Tabasco (H. II. Smith); Acapulco (Fred 

 Knab). 



