1903.] NATURAL SCIENCES OF PHILADELPHIA. 237 



ceding joints together. Thorax rather short, anterior angles rounded 

 but distinct, dorsal surface and pleurae somewhat flattened; meso- 

 epinotal suture distinct but without a constriction. Epinotal spines 

 very long and stout, directed backward, rather suddenly tapering 

 at their tips which are curved slightly inward and downward. Petiole 

 from above suboblong, twice as long as broad, sides nearly parallel, 

 posterior border a little broader than the anterior ; in profile the ante- 

 rior slope is distinctly and evenly concave, the posterior convex; 

 the anterior ventral surface has a distinct but rather blunt tooth; 

 summit of node blunt. Postpetiole hardl}^ half again as broad as 

 the petiole, as long as broad, with rounded but distinct anterior angles, 

 convex dorsally. Gaster of the usual shape, with distinct anterior 

 angles. 



Mandibles coarsely longitudinally rugose, hardly shining. Clypeus 

 somewhat shining, traversed even in the middle by several clean-cut 

 longitudinal rugse. Head shining, especially on the posterior and 

 postero-lateral portions; anteriorly with clean-cut longitudinal rugse, 

 which are coarsely reticulate and further apart on the cheeks, more 

 delicate on the crown and occiput. Thorax opaque, except the meso- 

 notum, which is somewhat shining. Neck coarsely and evenly punc- 

 tate; remaining surface of thorax covered with coarse, irregularly 

 longitudinal rugse w^hich extend up on the epinotal spines; interrugal 

 spaces with shallow foveolate punctures, forming a secondary reticu- 

 lation. Petiole and postpetiole opaque, coarsely rugose and punctate. 

 Gaster very smooth and shining. 



Hairs silvery- wliite, those on the head, thorax and abdomen very 

 regularly arranged, clavate, erect; on the antennse and legs minute, non- 

 clavate and appressed. 



Head and gaster black; thorax and pedicel dark-brown; antennse 

 and legs yellow ; scape and club of the former, coxse, femora and some- 

 times also the tibise of the latter, infuscated. Mandibles dark-brown, 

 their distal haK yellow. 



Female. — Length 3.5-4 mm. 



Head opaque, densely and rather finely longitudinally rugose. Eyes 

 moderate; ocelli rather small. Thorax opaque; pronotum coarsely 

 longitudinally rugose ; mesonotum traversed by numerous very regular, 

 parallel rugse. ScuteUum somewhat shining, covered with much more 

 delicate rugse than those of the mesonotiun and more reticulate and 

 less longitudinal in direction. Pleurse, epinotum and epinotal spines 

 covered with coarse reticulate rugse, which have a decidedly longitudi- 

 nal trend. Epinotal spines shorter, stouter and less curved than those 



