IS HYMENOPTERA FROM BORNEO. 



part of the propleurae is covered with close oblique striae, bordered 

 behind by a stout keel ; below it bear? stout, clearly separated, 

 longitudinal keels. Meso- and metapleurse stoutly reticulated, 

 covered with white pubescence ; the former with a large, 

 smooth and shining space at the apex. The 1st abdominal 

 segment is broad at the base, becoming gradually wider 

 towards the apex ; the sides are high, bordered above and below 

 and are roundly incised on the ventral side at the apex ; the 

 2nd and 3rd segments are closely, distinctly punctured ; the 4th 

 is weakly punctured, the others almost smooth. Metanotal 

 spines large, prominent, conical, yellow. Areolet longer along 

 the transverse cubital nervures than along the radius ; the 2nd 

 transverse cubital faint; the recurrent nervure is received 

 near the apex ; the transverse median behind the transverse 

 basal ; the transverse median in hind wings is broken not far 

 from the top of the lower third. 



Mesostcnoideus is a Mesostenus with spined metanotum. 



It may be as well to differentiate it from the Bornean allied 



genus Vagcnatha. The differences may be expressed as follows : 



Base of thorax above transverse, laterally projecting into 



stout, large teeth ; metanotum without a transverse keel and 



no petiolar area ; the lower sides of the petiole at the base 



and apex spined, areolet large, lenger than wide. 



Vagcnatha, Cam. 



Base of thorax rounded, not toothed, metanotum with a 

 transverse keel and petiolar area, the lower sides of abdomin- 

 al petiole not spined ; areolet small, almost square. 



Mesostenoideus, Ashm. 



In M. angulicollis, the labrum is incised in the middle ; 

 this is not the case with M. carinisentes, Cam., from Sikkim ; 

 the latter species differs further in the scutellum being flat and 

 keeled to the top of the apical slope. 



Pimplin^:. 



Accenitini. 



Xoridesopus, gen. nov. 



Areolet small, almost square. Disco-cubital nervure 

 unbroken. Transverse median nervure received distinctly 



Jour. Straits Branch, 



