222 P. CAMERON. HYMENOPTERA. 



transverse, the apex transverse, an irregular, longish oval spot on the apex of the mesopleurae 

 on the upper half and having a small roundish spot on its base below, a large transverse mark, 

 gradually narrowed inwardly, the end rounded, an oval spot, more narrowed above than below, 

 on the middle of the metapleurae, the apices of the basai six abdominal segments, the ist line 

 dilated laterally at the base, the 2nd with the base roundly narrowed; the other lines become 

 gradually narrower, and the last segment entirely whitish yellow. Four front legs whitish 

 yellow, the femora tinged with fuscous on the anterior, with rufous on the posterior ; the 

 hind coxae, apical joint of hind trochanters, the femora broadly on the sides and below, the 

 base of the tibiae narrowly, the rest except for a white band near the base and 2 on the 

 lower side and the basai half of the metatarsus, the rest of the tarsi white; the basai three- 

 fourths of the middle basai tarsal joint fuscous. Wings hyaline, the stigma and nervures black. cf. 



Length 1 1 m. m. 



Smooth, an oblique striated band on the upper half of the mesopleurae ; the meso- 

 pleural furrow striated, more finely at the base than on the apex ; the metapleurae finely 

 obliquely striated, the metanotum behind the keel obliquely, on the apex more closely and 

 finely obliquely striated. Metanotal spines short, broad, the metanotum has a straight, longish 

 oblique slope. 



3. Mesostenoideus trianguliferus sp. n. 

 Bivak Island, February. 



Black, the palpi, a large, longish triangular mark on the sides of the vertex, the 2 

 uniting in front of the ocelli and extending shortly behind them, scutellum, a conical mark, 

 twice longer than wide, below the fore wings, one of the same length, but square, below the 

 posterior pair, a conical mark, the narrowed end at the apex, in the middle of the metapleurae, 

 lines dilated laterally, on the apex of the basai two abdominal segments, a narrower one of 

 almost equal width, on the yà, a longish line on the sides of the 4*, and the whole of the 

 apical 2, yellowish white ; the anterior legs whitish yellow, the basai two-thirds of the coxae 

 black, the femora infuscated above and the tibiae, except at the base and apex, on the 

 outerside, the tarsi fuscous, joints 2 and 3 white at the base; the middle coxae white, black 

 at the base below, the middle femora dark rufous, broadly black below, the tibiae white, 

 narrowly black at the base and apex, the tarsi black, the apex of the ist narrowly and the 

 2 nd and 3 rd white. Wings hyaline, the stigma and nervures black, the areolet minute, open 

 at the apex, the transverse médian nervure received shortly behind the transverse basai ; the 

 disco-cubital nervure bluntly angled, not broken. Ç. 



Length 9 mm., terebra 2 m. m. 



Face strongly punctured in the centre, which is bordered by a strong transversely 

 striated band, the outer edge being smooth. Front and vertex smooth; the black ocellar région 

 forms a triangle. Metanotum closely transversely striated, the striae more or less curved, the 

 metapleurae closely obliquely striated, the striae stronger at the base. The base and apex of 

 the propleurae striated, the two bands uniting in the centre; there is an oblique band of 

 striae on the upper two-thirds of the meso-pleurae. Abdomen smooth and shining. 



