AMERICAN HYMENOPTERA. 441 



a semi-circular narrow area, extending from one side to the other, and 

 with one or two reticulations in the middle ; the rest is closely, strongly 

 reticulated ; the metapleurae more finely and irregularly reticulated, 

 almost smooth at the base above ; the spiracles of medium size, ovate, 

 about two and one-half times longer than wide. Outside the basal meta- 

 notal area is a stout curved keel, forming an area open on the outer 

 side. Propleurae smooth above, the rest stoutly striated ; the meso- 

 pleurae more finely at the base above, the apex is smooth, this smooth 

 part being longer than the striated base; the lower part is closely, 

 irregularly punctured. 



Mendoza, March. 



One example has the centre of the front, of the vertex, the 

 occiput, the upper apical part of the mesopleurae and the 

 lower part of the metapleurae black, the apex of the first 

 abdominal segment above, the second above and the apical 

 segments, black. Probably the amount of black varies in 

 this species ; the yellow is uniform in the examples seen. 



Anomalini. 

 25. Atrometus albopilosellus sp. n. 



Black, densely covered with white pubescence, the head, except the 

 front and vertex, the occiput, and the apex of mandibles, a narrow line 

 on the apical two-thirds of the pronotum, the tegulse and the palpi, 

 pale yellow ; the abdomen ferruginous, the base and apex of its first 

 segment, a line on the top of the second to fifth and the whole of the 

 apical two with the genital armature, black ; legs : the anterior pair 

 yellow, tinged with rufous above ; the middle pale rufous, their coxa? 

 and trochanters yellow ; the hind legs of a much deeper red color, the 

 coxae, apical two-thirds of the basal joint of the trochanters, the apical 

 joint above, base of femora, the tibia? above and the tarsi for the greater 

 part (the basal joints above, the apical entirely), black. Wings hyaline, 

 the costa pale at the base, the stigma testaceous, the nervures black, 

 cf. Length 14 mm. 



Head strongly closely punctured, the front and vertex more closely 

 than the face ; the latter is raised in the middle above and has there 

 a furrow. Pro- and mesothorax closely punctured, the scutellum 

 more widely than the mesonotum, its apex finely, closely, transversely 

 striated. Metanotum coarsely reticulated, its apex produced into a 

 distinct neck ; the metapleurae opaque, finely, closely rugose ; they are 

 more densely pilose than the mesopleurae. The wings reach close to 

 the apex of the second abdominal segment. 



Mendoza, March. 



TRANS. AM. ENT. SOC, XXXV. (56) DECEMBER, 1909 



