386 bulletin: museum of comparative zoology. 



119. Polyrhachis (Dolichorhachis, subgen. nov.) malaensis, 



sp. nov. 



Worker. Length 6.5-7.5 mm. 



Head oval, longer than broad, rather narrowly rounded behind. Cheeks 

 evenly convex. Mandibles 5-dentate. Clypeus distinctly carinate at middle; 

 anterior border notched at middle and angulately toothed at either side of 

 notch. Frontal carina narrow, moderately elevated, not divergent, extending 

 to opposite middle of eyes. Antennae long and slender. Eyes small, convex, 

 situated in front of side at posterior fourth of head. Thorax slender, flat 

 above, sides strongly, angulately margined, but not laminate. Pronotum 

 longer than broad, humeri with slender curved spines as long as their distance 

 from base to promesonotal suture, directed forward and upward and moder- 

 ately divergent. Promesonotal suture very distinctly, though narrowly 



Fio. 57. — Polyrhachis (Dolichorhachis) malaeasis Mann. Worker. Lateral view of 

 thorax and petiole. 



impressed. Mesonotum longer than broad, narrowed behind; sides in front 

 convex, behind concave. Mesoepinotal suture indicated by a distinct trans- 

 verse carina. Base of epinotum quadrate, longer than broad, with straight, 

 sharply margined sides, concave between spines and evenly rounding into the 

 declivity; declivity with convex surface, about as long as base. Spines long 

 and very slender, extending backward and slightly upward and but little 

 divergent. Petiolar node thick, anterior face in profile straight and forming 

 a prominent blunt angle with the flat dorsal surface; posterior surface convex; 

 spines very slender, longer than those of epinotum, moderately divergent, 

 extending backward and upward and curved inward. Gaster broadly oval. 

 Legs slender. 



Subopaque. Mandibles densely rugulose and striate apically. Clypeus 

 and head rugulose striate, the striae dense, oblique on clypeus and longitudinal 

 on head. Thorax, epinotum, and petiole striate similar to head. Gaster 



