1 66 WILLIAM MORTON WHEELER. 



growers. The most interesting species is the Oligomyrmex, 

 because no representative of this genus, which is widely dis- 

 tributed over the warmer portions of the Old World Southern 

 Europe, Asia Minor, Africa, Madagascar, India, Indonesia, 

 Papua, Australia has been taken hitherto in any part of the 

 New World. The new Hendecapheidole is also of interest, 

 because only two species of the subgenus have been described, 

 tachigalice Wheeler and enter soni Wheeler (1922), both from 

 British Guiana. 



TAXONOMIC DESCRIPTIONS. 

 Sericomyrmex amabilis sp. nov. (Fig. 4.) 



Worker. Length 3-3.5 mm. 



Very close to S. impexus Wheeler but differing in its somewhat 

 larger size and darker color and in the following structural details : 

 The head is more deeply excised posteriorly, the eyes are distinctly 

 larger and more convex, the posterior angles of the frontal lobes 



a 



FIG. 4. Sericomyrmex amabilis sp. nov. a, head of worker, dorsal aspect; b, thorax 



and pedicel of same in profile. 



more acute, the continuations of the frontal carinae which form 

 the inner boundaries of the scrobe-like depressions for the an- 

 tennae, more pronounced, the mandibles with less convex external 

 borders and more pronounced striae. Their surfaces are at the 

 same time more shining. The median joints of the antennal 



