228 P. CAMERON. HYMENOPTERA. 



longitudinal mark on the lower part of the mesopleurae, the base rounded, the apex oblique, 

 rcunded on the top; there is a longish incision above; the basai projection is larger than the 

 hinder, a longish conical mark immediately below the hind wings, its top wider at the apex, 

 through sloping upwards from the base, a longitudinal conical mark on the middle of the 

 metapleurae, nearer the top than the bottom, the base more rounded than the apex, the 

 basai half below becoming widened above and with its apex transverse, a transverse line of 

 equal width on the apex of the ist abdominal segment, a wider one on the 2^, its outer 

 fourth widened obliquely at the base, a line on the 3 rd , slightly gradually widened outwardly, 

 and Iines on the sides of the following segments, that on the 4* much wider than the others, 

 yellow. Legs whitish yellow, the femora tinged with fulvous, a wide irregular black mark 

 on the hind coxae, commencing at the base below and extending obliquely to the apex above, 

 the apical joint of the hind trochanters, the hinder femora above, the line commencing near 

 the base and becoming wider towards the apex, the hinder tibiae ail round narrowly at the 

 base and on either side from near this basai band to the apex, the 4 front ones behind, the 

 4 anterior tarsi with the greater part of the basai 2 and the anterior 3 of ail of them, black; 

 the spurs blackish, Wings hyaline, the stigma and nervures black ; the areolet with the outer 

 nervure faint, but distinct, the récurrent nervure interstitial with it; it is wider at the apex 

 than at the base; the transverse médian nervure interstitial; récurrent nervure widely bullated 

 in the middle. Ç. 



Length 13 m. m., terebra 4 m. m. 



Front and vertex smooth, the latter with an irregular keel down the middle ; it is 

 shortly bordered by a band of narrow striae. Face rather strongly and closely punctured, the 

 clypeus more shining, and more finely and sparsely punctured. Mesonotum shining, finely, 

 somewhat closely punctured, the furrows fine, distinct. Metanotum rather strongly transversely 

 striated, the basai area much more finely than the rest and with a smooth space at the base; 

 the rest much more strongly striated, the striae running into reticulations; those on the top 

 of the apical slope are stronger, wider apart and longitudinal. Metanotal spines longer than 

 they are wide at the base, the sides margined above, the apex bluntly rounded. Abdominal 

 pétiole smooth, the 2^à segment closely punctured,, the 3 rd still more finely punctured. 



Stiromesostenus, gen. nov. 



Areolet represented by a short thickened transverse nervure, there being only one of 

 them; the récurrent nervure is interstitial with it; the transverse médian nervure interstitial, 

 the transverse médian nervure in hind wings broken shortly below the middle. Parapsidal 

 furrows deep, ending at the base of the apical fourth, where they are united by a broad 

 rounded one, bordered behind. Scutellum roundly convex, but hardly raised above the meso- 

 notum; its sides are keeled to near the apex; the basai dépression wide, deep, bearing 4 

 s'tout keels. Metanotum short, the apex oblique, with a wide rounded latéral tooth; there is 

 a basai transverse keel ; the spiracles oval, about twice longer than wide. Post-petiole not 

 separated, the widening being gradually to the apex. Head wider than the thorax, the temples 

 very short, obliquely narrowed; the occiput almost transverse. Clypeus not separated by a 



