178 WILLIAM MORTON WHEELER. 



Yellow; legs and antennal funiculi somewhat paler. 



Described from single soldier and worker specimens found in 

 the soil surrounding a fungus chamber of Sericomyrmex amabilis 

 on Barro Colorado Island, C. Z. 



This minute ant, the first Oligomyrmex to come to light in the 

 New World, closely resembles its Old World cousins, except in the 

 shape of the thorax in the soldier. The fact that the eyes on the 

 two sides of the head are differently developed indicates that it is 

 somewhat abnormal, and since the thorax is somewhat like that 

 of a female in possessing scutellar and metanotal sclerites the 

 specimen may prove to be an incomplete ergatoid or pseudogyne. 



Tranopelta gilva Mayr var. columbica Forel. 



A small colony of workers with larvae of what I take to be this 

 form, originally described as a variety of T. heyeri Forel, was 

 found in the earth immediately surrounding a fungus-chamber of 

 Sericomyrmex amabilis on Barro Colorado Island. It is obviously 

 very close to the var. albida Mann of Matto Grosso, Brazil, but 

 the eyes are even smaller. The mesoepinotal impression is a 

 trifle less pronounced, the color is whitish as in albida and the 

 pilosity is the same. It is interesting to note that Forel found the 

 types of columbica at the bottom of the nest of a fungus-grower 

 Mycocepurus smithi Forel. Another colony, however, was taken 

 by him "in a subterranean nest, beneath dried cow-dung." 



Solenopsis conjurata sp. nov. (Fig. 8.) 



Worker. Length 1.4-1.5 mm. 



Head subrectangular, distinctly longer than broad, with feebly 

 convex sides and slightly concave posterior border. Eyes minute, 

 consisting of 5 or 6 abortive but pigmented ommatidia, placed 

 one-third the distance from the anterior to the posterior corners of 

 the head. Mandibles narrow, with oblique 4-toothed apical 

 borders. Clypeus with the two median teeth stout, acuminate 

 and turned inward, the lateral teeth short, broad and blunt. 

 Antennas rather slender; scapes reaching the posterior fifth of the 

 head; basal funicular joint as long as the three succeeding joints 

 together; joints 2-7 subequal, distinctly broader than long; the 

 2-jointed club somewhat longer than the remainder of the 



