198 Cameron, Hymenoptera Orientalia. 



ventral surface from the petiole whitish yellow; the hypo- 

 pygium also yellowish, narrowly lined with black down 

 the middle. 



Macrogaster FERRUGINEUS, Sp. nov. 



Ferrugineus ; flagello antennarum. pedibusque posticis 

 nigris ; alis hyalinis, apice fumatis. $ . 



Long. 9 mm. 



Antennae nearly as long as the body, the scape clear, 

 the base of the flagellum rufous ; the scape sparsely 

 covered with long, fuscous, the flagellum more densely 

 with short, black hair. Head yellow, except the front 

 broadly in the middle, the vertex and the upper part of 

 the occiput which are black ; the face strongly punctured, 

 thickly covered with pale, fuscous hair, its lower part 

 stoutly keeled in the middle ; the clypeus broadly 

 depressed in the middle, its apex smooth. Mandibles 

 black, smooth, yellow, its apex black ; the palpi pale 

 yellow, thickly covered with long, white hair. The inner 

 orbits are raised between the base of the antennae and the 

 lower ocellus ; above they are bordered by a deep and 

 wide furrow ; the vertex is covered with large, deep, clearly 

 separated punctures ; the front is aciculated, sharply 

 keeled down the middle ; the keel extending to below 

 the antennae and bifurcated at the top. Mesonotum closely 

 punctured ; the depression at the apex of the middle lobe 

 with four stout, longitudinal keels ; there is a shallow, 

 narrow furrow down the middle of the lateral lobes. The 

 scutellum punctured all over, but not quite so strongly 

 as the mesonotum ; its apex, and the postscutellum have 

 a yellowish tinge ; the latter is smooth ; the depression 

 at its side closely striated at the base ; its apex distinctly 

 keeled. The median segment has three basal areae, the 

 central being much the smaller ; the outer are sparsely 



