54 HYMENOPTEEA. 



bristles dull fulvous, the apical two segments punctured. Legs densely pruinose ; the 

 metatarsal brush dull fulvous. The second cubital cellule at the top is about two 

 thirds of the length of the third, and less than the distance bounded by the first 

 transverse cubital and first recurrent nervures ; the recurrent nervures are separated. 



Differs from N. violaceipennis by the body being narrower, especially the abdomen, 

 the latter also more sericeous, and having the pygidium longer, narrower, and rounded 

 at the apex; the scutellum impunctate, and not farrowed in the centre; the meso- 

 notum not depressed ; the antennae somewhat shorter ; the clypeus densely covered 

 with a fulvous pubescence and incised at the apex ; and, more particularly, by the 

 elongate second joint of the antennas, this joint being nearly half the length of the 

 third. 



^ 4. tfotogonia truncata. ~ j^^ZtJu.-'bTK ,^15 



Nigra, opaca ; oculis in vertice fere dupla longitudine antennarum articuli secundi inter se distantibus ; alis 



fusco-violaceis. 

 Long. 14 millim. 



Hab. Costa Rica, Cache (Rogers). 



Antennas about the length of the head and thorax united, the flagellum almost 

 glabrous, the scape sparsely pilose ; the first joint, if anything, shorter than the second 

 and third joints united, the lower side bluntly keeled, the base narrowed, the extreme 

 base scarcely projecting; the second joint about one third of the length of the third, 

 and incised at the base on the lower side; the third and fourth joints subequal. 

 Head opaque, the vertex sparsely covered with fuscous pubescence, the cheeks and 

 front with a silvery pile, the clypeus with moderately long fulvous pubescence. The 

 depression on the vertex is longer than broad, deep ; the furrow below the ocellus wide, 

 twice as long as broad ; frontal depression large, deep ; the furrow above the antennas 

 wide, shallow. Clypeus with the extreme apex shining, impunctate, the middle with 

 a small, but distinct, semicircular notch, above this impunctate ; edge opaque, coarsely 

 punctured, and bearing on the lower side some elongated foveas ; the centre is broadly 

 and indistinctly keeled. Mandibles striated at the base. Thorax opaque, alutaceous, 

 the metanotum finely coriaceous ; mesonotum truncated in front, not depressed in the 

 centre nor at the sides. Scutellum shining, obsoletely punctured ; the furrow on the 

 mesopleuras scarcely extending to the middle; metanotum with a shallow, not very 

 distinct, furrow in the middle, the apex oblique, and with a narrow, but deep, furrow 

 in the centre, the furrow commencing a little above the middle. The pubescence is 

 fuscous and close ; on the apex of the metanotum it inclines to fulvous. Abdomen 

 scarcely twice the length of the metathorax ; the segments with a silky pile at their 

 point of junction ; the pile on the apica\ segments fulvous ; pygidium short, broad, 

 truncated at the apex, the sides projecting, the top bearing long fuscous bristles, as 

 well as a stiff pubescence ; the apical two segments with scattered punctures. Legs 



