AMERICAN HYMENOPTERA. 449 



eyes. Basal half of mandibles rufous. Mesonotum with wide, curved, 

 crenulated parapsidal furrows, the space between them sparsely strongly 

 punctured ; the outer lobes smooth. Scutellum strongly punctured, 

 the centre not so closely as the rest, the apical central part being 

 smooth. Metanotum closely punctured, the punctures moderately 

 large, clearly separated ; the apical slope is densely covered with white 

 pubescence, closely weakly irregularly reticulated. The pleurae opaque, 

 except for a smooth shining space, narrowed behind, above the middle 

 of the mesopleurae, which are finely closely longitudinally striated on 

 the basal half above ; the apical upper part alutaceous ; the lower part 

 punctured strongly, but not deeply. Metapleurae finely rugose and 

 irregularly, but not closely at the base and below the apex, reticulated. 

 Metasternal forks triangular, obliquely diverging. Abdominal petiole 

 smooth, o". Length 4 mm. 



Third joint of antennae, if anything, shorter than the fourth, the 

 apical two joints black, the two before them infuscated. The long spur 

 of the hind tibiae is clearly distant from the middle of metatarsus and 

 is not much longer than the second joint. 



Mendoza, March. 



BETHYLID^E. 

 XESTOBETHYLUS gen. nov. 



Eyes large, occuping more than half of the head in front, 

 reaching to the base of the mandibles, pilose. Ocelli promi- 

 nent, in an equilateral triangle. Mandibles with a large 

 lower tooth, broad at the base, narrowed towards the apex, 

 which is bluntly rounded ; there are two upper teeth, not very 

 clearly separated at the apex, but with a distinct furrow 

 between them, the furrow broad and backwards extending 

 beyond them. Clypeus triangular, raised in the middle, the 

 sides from the top obliquely sloped. Antennas 13-jointed, stout 

 pilose, the third joint not much longer than the fourth, the 

 last three joints equal in length. Parapsidal furrows narrow, 

 but distinct ; there is also a lateral sternal furrow. Scutel- 

 lum longer than it is wide at the base, where it is bounded 

 by a transverse furrow ; the sides are furrowed ; it is not 

 quite so long as the mesonotum. Metanotum as long as the 

 pro- and mesonotum united, not narrowed towards the base, 

 strongly aciculated, keeled down the centre. Wings with a 

 distinct stigma, a long radius reaching close to the apex of 

 the cellule, a distinct costal cellule and two large basal 

 cellules, the anterior being longer than the other. Anterior 



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



