of Exotic Hymeiioptera. 307 



nervure uniting with the first transver so- cubital nervure. 

 Abdomen subsessile, ovoido-conic; the first ventral seg- 

 ment produced at the base, forming an obtuse angle. 

 (Female.) 



Acanthostethus hasalis. 

 (Plate VI. fig. 3, and details '6a and Sh.) 



Female. Length 4 lines. Black, with the collar and 

 base of the abdomen red. 



Head, thorax, and base of the abdomen coarsely and 

 deeply punctured, the rest of the abdomen more finely 

 and distantly punctured, and slightly shining. The man- 

 dibles, the scape, and the three following joints of the 

 antennae ferruginous beneath; the tips of the mandibles 

 black. The collar, tubercles, tegulge, and the margins of 

 the mesothorax opposite to them, the tips of the meta- 

 thoracic spines, and the legs, ferruginous; the wings 

 subhyaline, the nervures black. Abdomen : the base 

 rounded, the segment short, ferruginous, with the apical 

 margin pale yellow; the second segment black, with its 

 apical margin yellow, the sides of the segment are suffused 

 with obscure ferruginous, as well as the edge of the nar- 

 row yellow margin ; the following segments are obscure 

 ferruginous, the third segment as well as the apical one 

 black at the basal margin, in the apical one the black 

 forms an elongated spot. 



Hab. — Australia. 



In the British Museum. 



The general appearance of this insect is that of a very 

 large example of the Nysson dimidiatus of Europe. 



Genus Miscothyris, n. g. 



Head transverse, about the width of the thorax, eyes 

 ovate, very large and occupying the larger part of the 

 head ; the ocelli placed in a triangle on the vertex ; the 

 antennae inserted a little above the base of the clypeus, 

 approximate at their base, the flagellum sub-clavate ; the 

 mandibles arcuate, bidentate at their apex; the clypeus 

 triangular, its anterior margin slightly rounded; the 



2 A 2 



