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ginate within. Thorax slightly wider than the head; the dorsal surface 

 uniformly convex; pronotum, mesonotum, and scutellum sculptured 

 like the vertex. Anterior margin of the pronotum subtruncate; its 

 humerai angles sharp, but not mucronate, continued below in a 

 vertical carina. Scutellum with its surface on a plane with that of the 

 mesonotum; the latéral prolongations elongate, acute, with the tips 

 turned both downward and inward, so that the side of this scutellar 

 plate from a latéral aspect appears as a curved, spatulate, impunctate, 

 and polished line; the inner edges of thèse latéral prolongations run 

 obliquely downward, merging into the postscutellum, and the médian 

 part of the punctate, dorsal surface of the scutellum is also depressed, 

 joining almost imperceptibly with the postscutellum; so that the entire 

 scutellum viewed from above gives the impression of being broadly 

 emarginate. Postscutellum less elevated in the middle than in O. 

 quadrilobata; its summit slightly depressed, but separated by only 

 a weak ridge from the latéral sloping portion, which possesses such 

 deep pits as are présent in O. quadrilobata. Propodeum alate, much 

 as O. mocquerysi André; the dorsal and posterior surface very coarse- 

 ly, but shallowly reticulate; the three basai meshes larger than th? 

 remaining; of the three the médian one is somewhat prolonged pos- 

 teriorly; sides and apex of posterior surface less ccarsely reticulate. 

 Abdomen slender. First segment short; as seen from above its sides 

 divergent, except at the apex where they are for a short distance 

 subparallel and therefore contrasting with the strongly convex sides 

 of the second segment; seen from the side, the under surface is short, 

 but the sloping anterior face merges more insensibly in the dorsal 

 aspect than in O. quadrilobata, First tergite and base of the second 

 punctured about as coarsely as, but less closely than the vertex; the 

 rest of the second tergite, especially in the middle, more sparsely 

 punctate. Following segments finely and somewhat irregularly punc- 

 tate. First sternite with a médian carina ending in a blunt anterior 

 tooth. Second sternite unarmed. Last sternite plane, hirsute, and 

 unarmed. 



Habitat : Belgian Congo. One maie, Lemba (Mayombe), December 

 i-io, 1915 (R. Mayné coll.). 



Holotyp^ : Congo Muséum, Tervueren. 



