292 BILLKTIN: MISEIM of COMPAUATIVE Z0C)L0GY. 



IS. ErpoNEiL\ (Trachymesopus) sheldom, sp. nov. 



Murker. 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. Clypeus 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. Ej-es 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 bodj' with silkj- pubescence which is most abundant on head and 

 gaster and lacking on petiolar node; everywhere 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. 



De.scrihed 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 PVederick Sheldon, in whose memory the Sheldon 

 Travelling Fellowships of Harvard University were established. 



