P. CAMERON. HYMENOPTERA. 2 2J 



g. Mesostenoideus parvidentatus sp. n. 

 Alkmaar, November. 



Black, shining, with a slight plumbeous hue on the mesonotum, the 6 th to 13'h antennal 

 joints, palpi, a large semicircular mark on the inner orbits opposite the ocelli, tegulae, scutellum, 

 except the lower part of the apical slope, 2 transverse spots, narrowed on the outer edge, 

 rounded on the inner, on the metanotum touching the spines, an oblique longish oval spot, 

 twice longer than wide, on the upper apical part of the mesopleurae touching the striated 

 bordering furrow, a larger squarish mark on the upper basai part of the metapleurae, a 

 somewhat similar one, but smaller and oblique, immediately over the hind coxae, a longish 

 triangular spot — its basai part the longer, — on the post-petiole, a semicircular mark, with 

 its lower apical end projecting, on the sides of the 2nd ; a smaller, transverse triangular mark 

 on the sides of the yà, a large transverse mark, its outer part occupying almost the whole 

 segment, reaching close to the middle and gradually narrowed inwardly, a large mark on the 

 4*, its apex broadly, roundly incised to the base which is very narrow and a bell-shaped 

 mark on the apical half of the last, whitish-yellow; the apex of the 6 th and the 7* to 13 A 

 antennal joints white. Legs black, an irregular streak down the lower side of the fore coxae, 

 their apex narrowly, the trochanters, the lower side of the femora, the lower side of the tibiae 

 and their base and apex above and the 2 n d and 3^ tarsal joints; the middle coxae, — more 

 broadly below than on the side, — at the base largely, basai joint of the trochanters, the 

 greater part of the femora on the base and apex, the sides and beneath, the pale colour 

 tinged with fuscous, the tibiae, except broadly below, and the 2 Qd and yd tarsal joints; the 

 basai third of the hind coxae, a band ail round near the base of the tibiae, one of the same 

 length, but above only, near the apex and the apex of the ist and the 2 n(i and 3 rd tarsal 

 joints, white. Wings hyaline, the stigma and nervures black, the areolet punctiform, the i s t 

 transverse cubital nervure absent, the radius and cubitus almost meeting. Q. 



Length 15 mm., terebra 7 m. m. 



The middle of the front broadly, finely transversely striated, an indistinct keel down 

 the centre. The central part of the propleurae and the apex more regularly and narrowly 

 striated ; the mesopleurae except above, more strongly and obliquely, the metapleurae still 

 more strongly striated, except at the apex above; the metanotum slightly more strongly and 

 widely striated, the lower half of the apical slope with only a few striae. Mesonotum with a 

 plumbeous hue, the furrows narrow but distinct, reaching beyond the middle and finely 

 crenulated. Metanotal spines short, broad, rounded. 



10. Mesostenoideus striatipleuris sp. n. 

 Regen Island, September. 



Black, the palpi, the face except for a squarish black mark on the sides above, this 

 black part being wider than the projecting lower one, a large semicircular mark on the sides 

 of the vertex, extending from the hinder part to below the ocelli, tegulae, scutellum, a mark 

 on the sides of the apical slope of the metanotum, covering the spines, the latéral parts wider 

 than the top part which unités them; the latter is rounded above, narrowed at its junction 

 with the latéral branches, which only extend to the top of the lower third, tubercles, a large 



