2l8 P. CAMERON. HYMENOPTERA. 



below, shortly beyond the middle under the raised upper apical part, the lower apical part 

 of the metapleurae, commencing at the metanotal keel rugosely striated ; the metanotum from 

 the keel transversely, closely striated ; the clypeus, mandibles, malar space, palpi, basai two- 

 thirds of the scutellum, post-scutellum, tubercles, a small square, oblique spot near the middle 

 of the mesonotum, close to the sternal furrow, a large semicircular mark behind the posterior 

 wings, a large longitudinal rrlark in the middle of the metapleurae, 2 large marks almost 

 covering the apical slope of the metanotum, straight on the inner, rounded on the outer side 

 and ending above in a narrow curved point on the innerside and the apices of ail the 

 abdominal segments, that on the ist of equal width, the others dilated laterally backwards, 

 the ventral keel and the sides of the ventral segments, whitish yellow. Four front legs white, 

 the femora above and the tarsi fuscous ; the hind coxae white, largely black at the base 

 below and to a less extend at the apex above, the apices of both marks rounded, the 

 trochanters black, the femora rufo-fulvous, lined with black above and at the apex narrowly 

 ail round ; the tibiae and their spurs black, the tarsi white, the base black, the line as long 

 as the calcaria, and the apical 2 joints black. Wings hyaline, the stigma and nervures black, 

 the areolet small, narrow, twice longer along the radius than along the transverse cubitals, 

 open at the apex, where it is a little w'der than at the base ; the récurrent nervure received 

 almost at its apex and widely bullated. Q. 



Length 13 m. m., terebra 6 m. m. 



The clypeus is roundly convex and is clearly separated from the face, which is roundly 

 raised in the middle, depressed below and not very strongly transversely striated on the 

 raised part. Parapsidal furrows weak, indicated on basai half only. The 8 th to 13A antennal 

 joints are white. 



4. Mesostenus graciliventris sp. n. 

 Heuvel Bivak, November. 



Black, the 8 th to 14A antennal joints, clypeus, labrum, mandibles, palpi, malar space, 

 a broad mark on the upper inner orbits extending from the end of the vertex to the middle 

 of the front, obliquely, bluntly narrowed above, sharply so below, tegulae, scutellums, 2 lines 

 on the apical slope of the metanotum, commencing above the slope and reaching to the apex, 

 the upper third narrowed on the outerside, the narrowed part with a rounded curve, becoming 

 gradually widened to the bottom, the middle part of equal width, from the apex of which it 

 becomes narrowed to the bottom, on the top it becomes roundly narrowed to the bottom 

 of the top fourth, the rest being of equal width, straight, the tubercles, a conical mark on 

 the basai half of the lower part of the mesopleurae, a longish conical mark below the hind 

 wings, a large mark on the basai half of the metapleurae, bluntly rounded at the apex, the 

 lower part obliquely rounded, the apex more irregularly rounded, the top of the i st abdominal 

 segment, the yellow extending half way down the sides, not reaching to the middle and as 

 long as the following black portion, which is transverse at the apex; the apex is yellow, 

 slightly narrower than the preceding black part ; there is a narrower band, dilated laterally, 

 on the 3 rd , and much narrower lines, but widely, triangularly dilated on the sides on the 

 4 th and 5* and triangular marks on the sides of the 6 th and 7 th and the ventral segments, 

 except for black latéral marks, pallid yellow. Four front legs pale yellow, the femora tinged 



