274 REVISION OF THE THYNNIDiE OF AUSTRALIA, I., 



A.. RIXOSUS Sm. 



Thynnus rixosus Sm., Desc.n.sp.Hym. p. 168, n.27, 1879((J). 

 Hah. — Champion Bay, W.A. 



A. NUDULUS, n.sp. 



(J. Clypeus with a median carina from the base to tiie apex, 

 narrowly produced anteriorly. Head finely punctured, with 

 thin, short, grey pubescence. The thorax is a little more strong!}^ 

 punctured than the head, the scutellum short, broadly rounded 

 at the apex; the median segment obliquely depressed at the apex, 

 smooth and shining at the base, delicately punctured on the 

 apical portion. Abdomen subpetiolate, smooth and shining; 

 epipygium strongly punctured. Hypopygium with a small spine 

 on each side, thence gradually narrowed to the apical spine. 

 Black; the apex of the sixth abdominal segment and the pygidium 

 fuscous; spines of the tibiae testaceous. Wings hj^aline, irides- 

 cent, nervures black. Length 8 mm. 



^. Head quadrate, linely punctured; a short sulca between the 

 antenn*, broader than the prothorax. Prothorax a little longer 

 than wide, with a deep excavation on each side of the anterior 

 portion, divided by a prominent median carina; the mesothorax 

 small; the median segment subtriangular, abruptly truncate pos- 

 teriorly, flat above and sparsely punctured. Abdomen sub- 

 cylindrical, shining, very delicately punctured, the fifth segment 

 emarginate at the apex, epipygium lanceolate, with a strong 

 longitudinal median carina. Entirely light castaneous-brown. 

 Length 5 mm. 



y/rt6._Tweed River, N. S.W. 



Types in Coll. Froggatt, without locality, but the locality on 

 another male is as given. 



A. RIGIDULUS, n.sp. 



(J. Clypeus with a median longitudinal carina, narrowly pro- 

 duced anteriorly and truncate at the apex, clothed w4th grey 

 pubescence; front coarsely rugulose, occiput shallowly punctured. 

 Prothorax short, shining, depressed anteriorly; mesothorax and 



