92 Cameron, Hymenoptcra Orientalia. 



of the antenn.x ; the antennal keels are stout ; looked at 

 from the front their lower {)art is triangular. Face and 

 clypeus thickly covered with longish fuscous hair ; the 

 clypeus broadly and roundly keeled in the middle ; its 

 apex obliquely and roundly depressed ; the depression 

 margined above and below ; the tops of the mandibles 

 blackish. Prothorax smooth and shining, the upper part 

 of the pronotum stoutly margined ; mesonotum smooth 

 and shining, covered with long fuscous hair ; the 

 depression at the apex of the central lobe is large, 

 and has at the base two stout keels which are curved 

 backwards in the middle. Median segment depressed 

 at the base ; in the middle is a large area wider 

 than long, depressed at the apex, where the bounding 

 keels are stouter ; there is a similar, but smaller, 

 area at the apex. The apex of the propleuree, the 

 curved depression on the mesopleurs, and the apex of the 

 latter are stoutly striolated ; the lower part of the meta- 

 pleune irregularly, stoutly, longitudinally reticulated. 

 Mesosternum thickly covered with fuscous hair ; the 

 furrow is wide, crenulated ; its apex is black, wider, and 

 has two longitudinal keels, united by a transverse one. 

 Wings uniformly dark, smoky violaceous, with black 

 stigma and nervures; the branch on the second transverse 

 cubital nervure is short and is placed above the middle. 

 Abdomen smooth and shining, the base of the petiole 

 depressed. The anterior legs are entirely rufo-fulvous ; 

 the middle pair rufo-fulvous, with the coxae and tro- 

 chanters black. 



This species comes near to D. ruficollis Cam. {Man- 

 chester Memoirs, vol. xliii. p. 98), but that species may be 

 known from it by the mesonotum only being rufous, not 

 the entire mesothorax, and by the wings being yellowish 

 hyaline. 



