NEW FORMICID/E FROM BARRO COLORADO ISLAND. 



179 



funiculus; the terminal joint fully three times as long as the 

 penultimate, which is distinctly longer than broad. Thorax 

 rather slender, the promesonotum longer than broad, somewhat 

 depressed above, its outline in profile rather straight in the middle ; 

 mesoepinotal constriction distinct but not very deep; epinotum 

 small, as long as broad, in profile convex, rounded and sloping, 



FIG. 8. Sole-no psis conjurata sp. nov. a, head of worker, dorsal aspect; b, thorax 



and pedicel of same in profile. 



without distinct base and declivity. Petiole small, the peduncle 

 short, with a blunt anteroventral tooth, the node rather conical, 

 rounded, as long as broad when seen from above. Postpetiole 

 globular, a little broader than the petiolar node, somewhat 

 broader than long. Caster as large as the head, elliptical, with 

 straight anterior border. Legs rather slender. 



Smooth and shining throughout, with very fine, sparse, pi- 

 ligerous punctures. 



Pilosity whitish, moderately long and abundant, erect on the 

 body, more reclinate on the legs and scapes. 



Uniformly pale yellow throughout, only the teeth of the mandi- 

 bles reddish and the minute eyes black. 



Described from numerous specimens belonging to a populous 

 colony which was living in the earth surrounding a fungus 

 chamber of Sericomyrmex amabilis on Barro Colorado Island, C. 

 Z. These minute ants were kept for several days in an artificial 



