HYMENOPTERA. 63 



subspinose ; wings subhy aline, the nervures black. Abdomen 

 truncate at the base, strongly punctured ; the margins of the 

 segments constricted. 



Hob. Australia (Swan River). 



13. RHAGIGASTER TRISTIS. 



Male. Length 5 lines. Black : head and thorax opake, 

 covered with confluent punctures; the clypeus truncate; the 

 mesothorax with coarse deep punctures, those on the metathorax 

 finer; the wings hyaline and iridescent, the nervures black. 

 Abdomen shining, roughly punctured ; the margins of the seg- 

 ments constricted ; the apical segment with coarse punctures at 

 the base, its apex smooth, shining, and rounded. 



Hob. Western Australia. 



14. RHAGIGASTER APICALIS. B.M. 



Male. Length 9 lines. Black : the head and thorax coarsely 

 rugose and subopake; abdomen punctured and shining, the 

 margins of the segments constricted, and the two apical seg- 

 ments red. The clypeus with a raised central carina, which 

 runs upwards to the anterior stemma ; at the base of the clypeus 

 an oblique carina emanates on each side, running upwards to an 

 irregular transverse one in front of the anterior stemma ; the 

 antennae stout, and shorter than the thorax ; wings hyaline, the 

 nervures black ; the sides of the prothorax parallel, its anterior 

 margin slightly reflexed ; the metathorax truncate. 



Hob. Australia. 



This species is similarly coloured to the jR. hamorrhoidalis of 

 Guerin, but is much larger, and is readily distinguished by its 

 carinated clypeus and truncated thorax. 



15. RHAGIGASTER CASTANEUS. 



Female. Length 3* lines. Chestnut-red : the head shining, 

 with scattered punctures, the face rugose. Thorax with large 

 scattered punctures, the metathorax oblique; abdomen finely 

 punctured. 



Hob. Australia. 



16. RHAGIGASTER NITIDUS. 



Female. Length 4 lines. Shining black, sparingly punctured : 

 the face and antennae obscurely ferruginous, the mandibles and 

 legs bright ferruginous ; the mesothorax with a deep depression 



