54 HYMENOPTERA FROM SARAWAK. 



The antennre are longer than the body, are filiform, and 

 have the third joint distinctly longer than the fourth ; the 

 clypeus is roundly convex and is separated by a deep furrow 

 from the face ; the mandibles have two unequal teeth ; the 

 meso-pleural furrow is wide and deep and is interrupted in the 

 centre. The transverse median nervure is received behind the 

 transverse basal ; the stigma is narrow, lanceolate in the hind 

 wings; the cubital nervure is broken above the middle. The legs 

 are long and slender ; the claws moderate in size, the hinder 

 tarsi are longer than the others. The abdomen is bluntly 

 pointed and the last segment is larger than the penultimae. 



This genus may be referred to the Cryptinas, but it does 

 not quite agree with that group, as the spiracles on the petiole 

 are placed near the middle. The small, or more correctly, 

 obsolete areolet might place it in the Mesostenini ; but there is 

 no known genus in that group in which it could be placed. 



Diapetvs mgroplagiatus, sp. nov. 



Rufo-fulvo, vertice, mesonoto, metanoto, pleuris abdomi- 

 neque late nigro-maculatis ; alis flavo-hyalinis, nervis stigmatique 

 testaceis 2 . 



Long: 12; terebra 2 mm. 



Hab. Borneo ( Shelf ord). 



Antennae longer than the body, darker towards the apex. 

 Head smooth and shining ; the vertex and upper part of the 

 occiput largely black ; the front is broadly dark rufous in the 

 middle. Face and clypeus yellowish, smooth and shining, sparse- 

 ly covered with long black hair. Mandibles broadly black at 

 the apex, yellow at the base, rufous in the middle. Thorax 

 smooth and shining except the apex of the middle lobe and the 

 furrows. Scutellum and post-scutellum yellow. The base of 

 the median segment is black except in the middle depression ; 

 between the two keels are two large black marks, rounded and 

 narrowed at the apex ; the basal two-thirds of the mesopleuree 

 black ; the middle of the metapleurse broadly, and the greater 

 part of the mesosternum black. Legs coloured like the body ; the 

 hinder femora are darker coloured at the base ; the tarsi are 

 minutely spinose. Wings yellowish-hyaline ; the stigma testaceous ; 

 the nervures are of a darker testaceous colour. The petiole i 



