298 bulletin: museum of comparative zoology. 



in front of middle; anterior- border feebly arcuate at middle. Eyes and 

 ocelli large. Antennae slender; scape twice as long as first funicular joint, 

 which is about as broad as long; remaining joints becoming very gradually 

 shorter toward apex; terminal joint one and one third times as long as the 

 preceding joint, the apical third of it conical in shape. Prothorax in profile 

 a third as long as mesothorax. Mesothorax flattened distally, with strong 

 Mayrian furrows. Scutellum strongly convex, a httle broader than long. 

 Epinotum rounded above, disc of the declivous portion fiat. Petiolar node 

 in profile as long as high, anterior face convex and broadly rounding into the 

 top, posterior surface flat; from above, as long as broad, rounded in front and 

 at sides, truncate behind. A strong constriction between first and second 

 gastric segments. 



Somewhat shining. Head and prothorax striolate rugulose. Mesothorax 

 and scutellum wath similar sculpture and strongly and foveolately punctate. 

 Epinotum coarsely rugose. Petiolar nodes coarsely striate at sides and 

 heavily punctate throughout. Gaster finely punctate. 



Head and legs with long and silky recumbent hairs. Pilosity abundant; 

 on the gaster longer and less erect. 



Color black; mandibles, antennae, geniculae, and tarsi brown. Wings 

 inf uscated ; veins and stigma brown. 



Three Sisters: Malapaina (Type-locality). Malaita: Auki, Simoli 

 (Coll. H. Hall). 



Closely related to emcryi Forel, from the Bismarck Archipelago, 

 from which it differs in the structure of the epinotum and the clypeus. 



Key io the Papuasian Species of the Subgenus Leptogenys. 



1. Length 12 mm. Head distinctly longer than broad, with scattered pili- 



gerous punctures. Postpetiole and gaster rufous. (New Guinea). 



triloba Emery. 



Length 5 to 8 mm. Head not or but slightly longer than broad, rugosely 



punctate. Gaster black, sometimes with bluish reflections, rufous 



apically 2. 



2. Mandibles distinctly longer than sides of head. Petiole much longer 



than broad. Lobe of cl3rpeus elongate and rounded apically. Length 



7.5-8 mm. (Engano) modiglianii Emery. 



Mandibles not longer than sides of head. Petiole at least as broad as 

 long 3. 



3. Lobe of clypeus broad and trisinuate in front. Base of epinotum but little 



longer than the declivity. Length 5.8 mm. (Bismarck Archipelago). 



emeryi Forel. 



Lobe of clypeus not trisinuate in front. Base of epinotum much longer 



than the declivitj^ 4. 



