AMERICAN HYMENOPTERA. 427 



suture, commencing a little above the middle and not reaching to the 

 lower edge, a large mark, gradually dilated to the middle over the 

 hind coxas, and the sheath of the ovipositor, black. Hind femora 

 with eighteen small black teeth, the basal close together. Apex of 

 scutellum keeled, narrowed gradually to a blunt point, not incised or 

 toothed. Metanotum irregularly reticulated in the middle and at the 

 apex. Wings clear hyaline, the nervures black. 9 . Length 7 mm. 

 Head and thorax covered with blackish hair. Sides of the front 

 obliquely strited ; there is an obliquely striated depression between 

 the hinder ocelli and the eyes. Face roundly dilated in the middle, 

 sparsely punctured ; there is a row of strong punctures on the top of 

 the clypeus, the space between the clypeus and the eyes are closely 

 obliquely striated, the stria; roundly curved. Pro-, mesonotum and 

 scutellum strongly closely punctured. Metanotum bordered laterally 

 by a stout keel ; there is a keel down the middle which bifurcates 

 near the apex, forming an area which is stoutly longitudinally striated ; 

 there are thus three areae — two basal and a central apical one. Pro- 

 pleurae from near the top smooth ; the basal half of the mesopleurae 

 broadly smooth in the middle ; the top and bottom not very strongly 

 punctured ; the roundly dilated metapleurae much more strongly and 

 closely punctured. The basal and apical vertical furrows on the meso- 

 pleurae are longitudinally striated. Abdominal petiole short, about 

 one-half longer than wide, narrowed towards the apex, about as long 

 as the apical joint of the hind coxas. 



Mendoza, April. 



OCTOSMICRA Ashm. 

 10. Octosmicra curvidentata sp. n. 



Yellow, the flagellum of antennae above, the middle of frontal depres- 

 sion, tips of mandibles, the occiput, except round the edges, two lines 

 on the centre mesonotum, converging towards the apex, a longish oval 

 spot on the centre of the lateral lobes, a transverse one at the apex, 

 bordering the base of the scutellum, a line on the centre of the scutel- 

 lum, acutely pointed at the base, widened towards the apex, which is 

 rounded, a line bordering the basal half of the scutellum, the base of 

 the propleurae, the line gradually widened below, the bottom of the 

 central depression of mesopleurae, the line narrowed above, two spots 

 below the hind wings, a small spot on either side of the middle of the 

 metanotum, transverse lines, roundly narrowed on the base, on the 

 sides of the second, third, fourth and fifth abdominal segments, the 

 apex of the hind coxae, a small spot on the inner and outer side of the 

 base and apex of the hind femora, the base and apex of the hind tibiae 

 narrowly and the femora teeth, black. The basal two and the apical 

 femoral teeth small, the apical stouter than the basal two and close 

 together, the basal acuter and clearly separated ; the four middle teeth 



TRANS. AM. ENT. SOC, XXXV. DECEMBER, 1909 



