360 bulletin: museum of comparative zoology. 



A large series of workers from several localities agree with Emery's 

 description of yroccra except that the postpetiole is not margined at 

 sides and the size averages smaller. (Length 3-3.5 mm.) 



The female is distinctly smaller (Length 4 mm.) than in typical 

 proccra, though agreeing in other respects. The wings are rather 

 strongly infuscated, with brown veins. 



Small colonies were found between layers of rotten wood or beneath 

 bark when there was moisture. It is a very slow moving species. 



There is considerable variation in the color of the workers, from 

 rufotestaceous to rufofuscous, though none approach the very dark 

 <;»li>t of the following variety. Typc.— M. C. Z. 9,18L 



86b. Rhopalothrix procera Emery, subsp. malua Mann, var. 



melanotica, var. nov. 



A single worker from Tulagi is different from any of the large series 

 of the preceding form before me in being piceofuscous in color, much 

 darker than the most extreme of subsp. malua. 



Key to Papuasian Species. 



Smaller species, less than 2 mm. in length L 



Larger, more than 2 mm. in length 3. 



1. Petiolar node not longer than broad; front with a transverse impression 



between clypeus and vertex (New Guinea) hrevicornis Emery. 



Petiolar node twice as long as broad; front without transverse impres- 

 sion 2. 



2. Head broader; very shallowly and broadly excavated behind. (New 



Guinea) -punctata Szabo. 



Head narrower, more deeply and narrowly excavated behind. Head, 

 thorax, and abdomen with clavate and squamiform hairs intermingled. 

 (New Guinea) mixta Szabo. 



3. Oblique portions of sides of head convex in outline; occipital border feebly 



concave; supraocular portion of head with squamiform scales. Length 



2.3 mm. (New Guinea) hiroi Szabo. 



Oblique portions of sides of head slightly concave in outline; occipital 

 border strongly concave; hairs on front uniformly distributed 4. 



4. Outer border of mandibles strongly concave before middle, so that the 



apical portions are slender. Humeral angles evenly rounded. (Solo- 

 mons) isabellae Mann. 



Mandibles of usual form, not constricted. Humeral angles subgibbous 5. 



