224 P - CAMERON. HYMENOPTERA. 



5. Mesostenoideus varipetiolatus sp. n. 



Bivak island. 



Black, the thorax with a plumbeous line, joints 11& to 16A of antennae, palpi, a mark 

 on the inner orbits, near the ocelli, rounded outwardly, more narrowed below than above, 

 above extending to the end of the vertex, tegulae, the scutellum and a small spot on post- 

 scutellum, a spot in the middle of the apical part of the metanotum, covering the spines, 

 transverse below, roundly narrowed above, a large spot behind the hind wings, roundly 

 narrowed inwardly from the keel, a spot on the apex of the metapleurae, bluntly rounded 

 above, the base also rounded, and narrowed below, the lower part and apex transverse, the 

 i st abdominal segment above to the spiracles, the sides beyond them, the basai half with the 

 line wider than the apical, the underside, the sides of the 2 nd segment broadly from the 

 base to shortly beyond the spiracles, the marks a little wider than the black central part, 

 a shorter, wider spot on the sides of the y d , roundly narrowed from the outer to the inner 

 side, the 4'h except for a wide triangle in the centre, the last segment, and triangular marks 

 on the sides of the 2^ d to 4A ventral, whitish yellow. Fore coxae black, the trochanters 

 white, the femora fuscous, the tibiae white, fuscous above, the tarsi white, the apical 2 joints 

 black, the middle coxae black, with a large mark, roundly incised at the apex, and not 

 reaching to the middle, the basai trochanter white, the apical black, the femora fuscous, 

 blackish above, the tibiae white, fuscous above, more broadly at the apex than at the base, 

 the apical line being longer than the spurs, the tarsi black, joints 2 and 3 white, the hind 

 legs black, the basai third of the coxae, a line as long as the 2 nd tarsal joint, near the base 

 of the tibiae, the apical fourth of the ist tarsal joint and the whole of the 2nà, 3rd and 4*, 

 white. Wings hyaline, highly iridescent, the stigma and nervures black, the areolet represented 

 by a short, thick nervure, (f. 



Length 16 m. m. 



There are a few striae in the middle of the propleurae, the upper half of the mesopleurae 

 is closely longitudinally striated from the basai keel to the middle on the upper half, then 

 the striae run obliquely to the lower apical part; the metapleurae closely, distinctly punctured. 

 Tibiae sparsely, the tarsi closely spinose. 



6. Mesostenoideus megaspilus sp. n. 



Bivak Island, February. 



Black, shining, smooth, except for the upper apical half of the propleurae, the apex 

 narrowly, a narrow band running down from the top of the mesopleurae near the tegulae, 

 the part below this, from the base to the apical third, the striae irregular and more or less 

 curved and the metapleurae which are closely, obliquely, more strongly, striated ; and the 

 metanotum from the keel, which is irregularly transversely striated above, more strongly on 

 the apical slope, where the striae are more rounded and curved ; the spines are distinct, black, 

 not very broad, narrowed towards the apex, cylindrical, longer than they are thick at the 

 base. The following parts are pallid yellow: — the palpi, a large, semicircular mark on the 

 vertex, between the ocelli and the eyes, touching both, scutellum, the part of the metanotum 

 between the transverse keel and the spines, a large mark on the upper part of the metapleurae, 



