460 bulletin: museum of comparative zoology. 



A common species, frequently seen on leaves and tree-trunks. It 

 nests in hollow twigs or in rotten wood. 



46a. Tetramorium (Tetramorium) pacificum Mayr, var. wilsoni, 



var. nov. 



Worker. Length 2.75 mm. 



Differing from t^^pical pacificum in its color, being brownish yellow through- 

 out, and in having the striae on front of head much finer, 



Viti Levu: Nausori (Type-locality), Waiyanitu. Vanua Levu: 

 Lasema, Suene. Kadavu: Vanua Ava. 



This variety nests in rotten wood or hollow twigs. 



47. Triglyphothrix pacifica, sp. nov. 



Worker. Length 2-2.25 mm. 



Head a little longer than broad, as broad in front as behind, sides nearly 

 straight, occipital angles rounded, border straight. Mandibles 5-dentate. 

 Clyjoeus slightly convex at middle, anterior border broadly rounded. Frontal 

 carinae feeble, extending to tip of antennae, scrobes broad and shallow. 

 Antennal scapes stout, extending seven eighths the distance to occipital 

 corners; first funicular joint as long as the second and third together. Eyes 

 large and convex, situated at sides of head in front of middle. Thorax robust, 

 broadest at humeri, which are broadly rounded; arcuate in profile. Epinotal 

 spines stout, straight, as long as their distance apart at base, directed back- 

 ward and slightly upward. Petiolar peduncle short, node in profile longer 

 than high, with concave anterior and slightly rounded posterior surfaces and 

 broadly convex dorsum; from above subglobose, a little longer than broad. 

 Postpetiole as broad as petiole, slightly broader than long; in profile higher 

 than long, rounded above. Legs stout. 



Opaque, except postpetiole and gaster which are shining. Mandibles 

 coarsely striate. Head, thorax, epinotum, except between spines and the 

 declivity, densely, foveolately pitted, with reticulate .carinae between the pits; 

 antennal scrobes rugose; front of head with a median carina that extends 

 from base of clypeus one third the length of head. 



Pilosity short, fine, and abundant. 



Dark brown to black, appendages light reddish brown. 



Female (dealated). Length 2.50 mm. 



Except for the usual sexual modifications, differing from the worker only in 

 the somewhat shorter epinotal spines and in the petiolar node being a little 

 broader than long. 



