P. CAMERON. HYMENOPTERA. 223 



4. Mesostenoideus tanyopiis sp. n. 

 Bivak Island, January. 



Black, the apex of the 6* antennal joint, the 7* to io th and the base of the nth ; 

 palpi, tegulae, the metanotal spines, a transverse spot uniting them behind, the mark rounded 

 at the base, an oblique, pyriform mark on the base of the mesopleurae below, a squarish 

 mark behind the hind wings, a slightly smaller spot on the apex of the metapleurae, a little 

 wider than long, the base broadly rounded, the apex transverse, an irregular oblique spot on 

 the base of the 2nd abdominal segment, on the sides covering the gastracoeli, a transverse 

 mark on the sides of the yà-, narrowed inwardly, its outer sides projecting, the middle roundly 

 dilated, the space between the spots wider than them, a wider mark, not so much widened, 

 on the outer side, a longish transverse oval mark on the sides of the 7* on the basai three- 

 fourths, the 2 separated from each other by one third of their length, and the last segment, 

 except the sides at the base, almost the whole of the 2 n <i ventral, a triangular mark on the 

 sides of the y& with a narrow line between and narrow lines on the others, pale yellow. 

 Fore coxae black, the trochanters white, the femora white, lined with fuscous, the tibiae 

 fuscous, with a broad white line behind, commencing near the base, except at the apex; the 

 tarsi black, the 2 nd joint white, the middle coxae black, with a broad mark of equal width, 

 not reaching to the apex, the trochanters with the basai joint white, the apical black, the 

 femora fuscous, darker above, the tibiae with the base narrowly fuscous, the under side white, 

 a broad white band on the basai half ail round, the apical half blackish; the hind coxae 

 black, the basai third white above, the basai joint of the trochanters white, the rest black, 

 except for a white band, as long as the longer spur, near the base of the tibiae and the 

 2nd and 3 rd joint of the tarsi. Wings hyaline, very iridescent, the stigma and nervures black, 

 the areolet with only the inner nervure indicated, the récurrent nervure received shortly 

 beyond it; the apical abscissa of the radius broadly roundly curved. 9- 



Length ij m. m., terebra 6 m. m. 



Mandibles before the teeth brownish. The sides of the face obliquely striated above, 

 followed by a band of fine longitudinal striae; the front below the ocelli is finely, closely 

 obliquely striated, the rest much more strongly transversely striated. The parapsidal furrows 

 are fine, reach to the base of the apical third and are finely transversely striated. The base 

 of the metanotum is smooth, the rest finely, closely irregularly striated and with some punct- 

 ures; the part between the keels is closely, strongly transversely striated; the top of the 

 apical slope smooth to near the centre, the rest strongly transversely striated. Propleurae 

 finely closely punctured, except below, the central hollow with some striae; mesopleurae closely, 

 and somewhat more strongly punctured, the basai half closely, obliquely striated ; the apical 

 furrow crenulated ; the metapleurae similarly punctured below the keel ; the spiracles are 4 

 times longer than wide. Metanotal spines black, broad, short. Abdomen smooth. The hind 

 legs are longer and stouter than usual; their tibiae sparsely, the tarsi closely spinose. 



The form and shape of the white markings vary; the mark on the metanotum may be 

 transverse or rounded at the base; more than one of the tarsal joints may be white. 



