Hynienoptera. 325 



sharply angled laterallj'. Sides of scutellum largely raised into a 

 keel oi- tooth ; its highest i)art is be,yond the middle ; the i)asal and 

 longer slope is straight, obliquely sloped : the apical has a more 

 rounded slope ; the sides of the post-scutellum rise into a prominent 

 tooth, which is triangular as seen from behind ; its apex has a more 

 rounded, dilated slope than the base. Sides of metanotum broadly 

 rounded. Basal segment of abdomen cup-shapeil ; the 2nd segment 

 is as long as its width at the apex. 



This species comes close to O. Wliiteanux, Cam. ; proI)al)!y the 

 coloration differences between the two are not of mucli import- 

 ance ; but there are structural differences between them ; e.q. the 

 base of the thorax in Whifeanus is not so transverse, it being 

 somewhat dilated in the middle ; the keel on the sides of the 

 scutellum is less prominent, it being less prominent and not so 

 iiigh as that on the post-scutellum. the opposite being the case with 

 the present species ; the post-scutellal keel on WJu'feanus is more 

 prominent, longer and more broadly and tlistinctly rounded above, 

 its pterostigma testaceous, not black ; and there is no keel on the 

 2nd dorsal segment of the abdomen which is shorter compared 

 with the width. 



Odynerus quadrituherculatus, Sm. (Cat. Hj-men. Ins. Brit. 

 Mus. V, 70) from Port Natal appears to be related to the present 

 species and to O. Whiteanus. The terms used by Smith for the 

 scutellums " sub-dentate on each side laterally " can hardly be 

 applied to the two species I have described. 



Odynerus r/'yt/irofoinus, sp. nov. 



Black, the underside of the scape, mandibles except their 

 teeth ; a small mark, wider than long, rounded and narrowed 

 above, slightly incised in the centre below, clypeus, labrum, a short 

 line above the middle of the outer orbits, a band on the apex of the 

 pronotum, dilated laterally, a small spot on the sides of the 

 scutellum, the greater i)art of the ])ost-scutellum, a line on the 

 apex of the 1st abdominal segment al)ove, and a broader one on the 

 2nd, all round, j'ellow. Legs rufo-testaceous, the fore coxi« and 

 trochanters, the base of the fore femora narrowlj% the middle 

 coxfe above, ti-ochanters, femora to beyond the middle, the hind 



