NEW FORMICID^E FROM BARRO COLORADO ISLAND. 175 



Described from two soldiers, numerous workers and two males 

 taken from a colony that was nesting in the soil immediately 

 around the fungus chamber of a Sericomyrmex amabilis nest on 

 Barro Colorado Island, C. Z. 



This is quite distinct from the two other known species of 

 Hendecapheidole, tachigalice Wheeler and emersoni Wheeler. The 

 soldier of mendicula can be at once distinguished from that of 

 tachigalice by its dark color and the very different sculpture of the 

 head, the worker by its color and much stouter epinotal spines. 

 The soldier emersoni is unknown, but the worker is paler than that 

 of mendicula, much less pilose, with less developed epinotal spines. 

 The male emersoni has a broader and differently shaped head, 

 stouter petiole, coarser sculpture, darker wings and 1 1- instead of 

 12-jointed antennae. The types of tachigalice were found in- 

 habiting the petiolar swellings of a myrmecophyte (Tachigalia 

 panicidata Aublet), those of emersoni a small cell within a termite 

 nest (see Wheeler, 1921, p. 148, and 1922, p. 4). 



Oligomyrmex panamensis sp. nov. (Fig. 7.) 



Soldier. Length 1.3 mm. 



Head large, rather flat, fully i| times as long as broad, very 

 slightly broader in front than behind, with straight, subparallel 

 sides and deeply, semicircularly excised posterior border. A well- 

 developed anterior ocellus is present. Eyes very small, situated 

 about ^ the distance from the anterior to the posterior corners of 

 the head. In the specimen the right eye is larger and pigmented, 

 the left very minute and colorless. Mandibles short and convex, 

 with about five blunt teeth. Clypeus very short and abrupt, its 

 anterior border bluntly bidentate, sinuately emarginate in the 

 middle and on the sides. Frontal carinae short but well-de- 

 veloped, rapidly diverging. Antennae small and slender, 9- 

 jointed; the scapes reaching the lateral border of the head at 

 points two fifths the distance from its anterior to its posterior 

 corners. The 2-jointed club is as long as the remainder of the 

 funiculus, the terminal joint large and swollen, fully three times 

 as long as the penultimate, which is distinctly longer than broad ; 

 joints 2-4 subequal, broader than long; 5-6 nearly as long as 

 broad, the basal joint as long as 2-5 together. Thorax narrower 



