292 bulletin: museum of comparative zoology. 



18. EupoNERA (Trachymesopus) sheldoni, sp. nov. 



Worker. Length 3.75 mm. 



Head a little longer than broad, with feebly convex sides and narrowly 

 rounded occipital corners; occipital border narrowly but rather deeply con- 

 cave at middle. Cl3T)eus broadly rounded in front; strongly carinate at 

 middle, the carina produced in front to form a strong, blunt spine. Mandibles 

 with six stout, triangular teeth. Frontal lobes triangular, flat; the frontal 

 impression between extending to occipital border. Antennal scapes not 

 reaching occipital corners; the funicular portion without trace of club; the 

 joints except first and terminal gradually increasing in size, each only slightly 

 transverse. Eyes very minute; located in front of sides at about one fifth 

 the distance from mandibles to occipital corners. Prothorax a little broader 

 than long; rounded above, in front, and at sides. Mesothorax transversely 

 oval; in profile almost flat. Promesonotal and mesoepinotal sutures strongly 

 impressed. Ease of epinotum flat, broadest at middle, as broad in front as 

 behind; declivity flat, roundly margined at sides. Petiolar node thick; in 

 profile highest at front , anterior surface concave , apex gradually sloping into 

 the front surface and broadly rounding into the convex posterior surface: 

 from above, rounded at front and sides, straight behind, semicircular in shape; 

 less than twice as broad as long. Basal surface of first gastric segment flat. 

 Constriction between first and second segments strong. 



Head, thorax, and epinotum somewhat shining; petiole and gaster more 

 strongly shining. Mandibles sparsely punctate; head and antennae densely 

 punctate. Punctation of thorax, abdomen, and legs similar to that of head 

 but much more shallow. 



Head and body with silky pubescence which is most abundant on head and 

 gaster and lacking on petiolar node; ever^-where with sparse, very fine erect 

 pile. 



Color brownish yellow; vertex with a small fuscous spot; and tarsi and 

 mandibles a little darker. , 



San Cristoval: Wainoni Bay. 



Described from one worker. 



Related to E. (T.) crassicornis Emery, known only from a female 

 from New Guinea, but the petiole is much longer than deep and the 

 thorax is not shining and the funicular articles 2-4 are not much 

 broader than long. 



Dedicated to Frederick Sheldon, in whose memory the Sheldon 

 Travelling Fellowships of Harvard University were established. 



