228 REVISION OF THE THYNNID^ OF AUSTRALIA, I., 



the base, the basal area without punctures. Hypopygiuiu broad 

 at the base witli a central recurved aculeus and two long lateral 

 spines. A deep notch beneath between the first and second 

 segments, the tubercle at the base of the first segment very 

 slightly developed, and no tubercle on the basal margin of the 

 second segment : the segments beneath more strongly punctured 

 than above, the two apical segments more finely and densely than 

 the others. Entirely shining black, the wings fuscous flushed 

 with violet, the uervures black. Length 16 mm. 



Hah. — Port Essington. 



Type in Oxford University Museum, ex Coll. Shuckard. 



Near R. kevigatus Sm., but differs by the tridentate hypopy- 

 oinm, the absence of a tubercle at the base of the second 

 abdominal segment beneath, the narrower clypeus and more 

 triangular scutellum. 



From beyond Australia one true Rhagigaster has been described. 



Rhagigastkr novar.e Sauss. 

 Rhagigaster novaroi Sauss.. Raised. No^ . Zool. ii. l,Hym.p. 112, 

 1867. 



Thynnus heiJeri D.T., Cat. Hym, viii. 108, 1897. 



Hah. — New Zealand. 



Apparently allied to R. unicolor Guer. 



Other species which have been assigned to Rhagigaster^ but 

 which I do not place either in Rhagigaster or in the allied genera 

 Rhytidogaster or Enteles are : — 



R. iUustris Kirby (Horn Exped. Pt.l, 1898) g. 



i?./avi//-oHsSm.(Trans.Ent.Soc.London(3),ii.5,p.390,1865)9. 



R. clypQatus Sm. (Descr.n.sp. Hym. 177, 1S79) [$'] identical 

 with Thynnus coelehs Sauss. ($), and with Thynnus clypearis 

 Sauss.((JO). 



Bethylus apterus Fab. (Syst. Piez. p.238,2) is placed- by West- 

 wood in this genus; but I do not think " abdomen pilosum " 

 could be applied to any Rhagigaster. 



