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i. Mesosternum not tuberculate in front of the middle coxae, the 

 interstices of the puncturation forming a weak transverse ridge. 

 Mesopleurae uniformly convex, with neither a médian dépression 

 nor a superior tubercle. Clypeus broadly flattened; the médian por- 

 tion somewhat convex and ending above in an interantennal carina; 

 the anterior margin emarginate, the edge of the emargination bearing 

 stiff setse. Middle of last tergite without a translucent spot. Two basai 

 abdominal segments red rufopicta André. 



Mesosternum with a strong, transverse tubercle in front of each 

 middle coxa. Mesopleurae with a strongly elevated, oblique tubercle 

 below the tegulae... 2. 



2. Last tergite without a médian, translucent spot. Apex of the 

 clypeus not semi-circularly emarginate.... delagoensis André. 



Last tergite with a médian, translucent spot. Clypeus emarginate 

 and bidentate at apex................. albistyla (Saussure). 



Smicromyrme (Trispilotilla) melanocephala (Bischoff). 



The female spécimens which we hâve seen from the Belgian Congo 

 présent the following structural peculiarities : Clypeus : basai (upper) 

 field ending in a raised, bluntly thickened plate which overhangs the 

 médian disk below it; the disk itself scooped out, margined on each 

 side by a carina which projects at its edge. Carina of first sternite 

 divided into two subequal teeth by an interval wider than the teeth. 

 Propodeum not divided from the thorax proper. 



In the maie the clypeus has its upper portions raised and produced 

 upward acutely between the antennae; the raised surface densely 

 covered with erect, black bristles which somewhat obscure its struc- 

 ture; this portion margined below by an elevated, prominent U- 

 shaped carina, the arms of which turn outward and gradually disappear 

 above; this U forms the summit of the vertical, lower face of the ele- 

 vated area; from its base at the middle two carinje extend obliquely 

 outward to the anterior margin of the clypeus, becoming sharper 

 and more elevated as they proceed and delimiting an apical, very 

 broadly triangular, slightly concave area, which is but slightly punc- 

 tulate and moderately shiny; between this and the upper, elevated 

 area the sides of the clypeus are more or less punctate and hirsute; 



