448 bulletin: museum of comparative zoology. 



Worker minor. Length 4 mm. 



Differing from the worker major in the following characters: — 



The head is distinctly longer than broad with less convex sides. The eyes 

 are larger; the antennae are shorter, their scapes extend but little more than 

 half the distance from eyes to occipital corners. 



The sculpture of the head is finer and composed of costae, which are sparse 

 and irregularly longitudinal on vertex and front and tortuose behind, with the 

 interspaces pitted and, toward the sides, rugulose. The costae of the thorax 

 and epinotvim are not tortuose, but rather irregularly longitudinal. 



The head, petiole, and postpetiole and lower portions of thoracic pleurae are 

 deep black. 



VitiLevu: Nadarivatu. 



Described from a series taken from a small colony that was nesting 

 in a hollow twig of a recently felled kauri tree, and a couple of indi- 

 viduals found on leaves. It is evidently arboreal and may, like the 

 species of Podomyrma that I found in the Solomons, be widely dis- 

 tributed though locally very hard to find. 



Though the color of the worker major differs from that of the worker 

 minor it is constant in indi\dduals of either phase and correlated by 

 the difference in the shape of the head and in sculpture. 



This beautiful species is dedicated to Senirewa, a native princess. 



36a. Poecilomyrma senirewae Mann, subsp. myrmecodiae, 



subsp. nov. 



Worker major. Length 5 mm, 



A small series of workers found in a Myrmecodia bulb differ from typical 

 senirewae in color, the head, postpetiole, and legs being black and the petiole 

 infuscated at apical half, resembling the worker minor of senirewae, but differ- 

 ing in being as large as the worker major of that form and with a shorter head, 

 more convex at sides. 



VitiLevu: Mt. Victoria. 



Archaeomyrmex, gen. nov. 



Medium sized, short bodied species. Head large and broad, convex in 

 profile, with the lateral inferior edges strongly margined. Cheeks swollen 

 and rounded. Clypeus narrowed in front of antennal fossae, rather broad at 

 middle, with trilobed ^anterior border. Mandibles large and thick. Frontal 



