218 KEVISION OF THE THYNNID.« OF AUSTRALIA, I., 



R. UNICOLOR Guer. st. ephippiger Guer. 



Diamma epJiippiger Guer., Voy. Coq. Zool. ii 2, p. 235, Ib'SO 

 OS39)9. 



Rhagigaster aethiops Sm., Descr. ii.sp.H\'ni.i).175,ii.l, 1879((J). 



Thynnus ilberhorstii D.T., Cat. Hym. viii. 117, 1897((J). 



The mrtle has the anterior lateral angles o£ the j.rothorax 

 strongly developed, the carin^e on the elypeiis mucli less pro- 

 minent than in the typical unicohr, and tlie mesothorax and 

 scutellum more strongl}' punctured. The wings are hyaline or 

 very slightly tinged with violet. 



The female has the head as bi oad as long, as in mandihularis, 

 but it is narrower on the posterior margin. The mesothorax is 

 slightly broader than in maiidibnfaris and the median segment 

 shorter and rather wider at the base. The spots on ti)e head are 

 almost or quite absent, and the mesothorax, median segment and 

 the whole of the legs are ferruijinous-red. 



Hab. — Melbourne, Yic. ; Kangaroo Island, Adelaide, S.A. ; 

 Albany, VV.A. 



I do not consider these forms sufficiently distinct to watrant 

 full specitic i-ank, and so have retained them only as geopraphical 

 races. 



R. FUSCIPENNIS Sm 



Rhagigaster fuscipenuis Sm,, Descr. n.sp. Hym. p.l7o, n.2, 

 1S79((J). 



(J. Clypeus tinely punctured, with a median carina branching 

 before the centre, the branches reaching the anterior margin. A 

 carina rounded at the apex between the antennae, and another, 

 transverse and undulating between the eyes, below the anterior 

 ocellus. Head nan-owed posteriorly, strongly punctured. Thorax 

 and scutellum coarsely punctured, the prothorax narrowed 

 anteriorl}^ the anterior margin slightly raised; the scutellum 

 narrowly truncate at the apex. Median segment strongly punc- 

 tured at the base, depressed and more finely punctured at the 

 apex. Abdomen sparsely punctured above; segments 2-5 with 

 an impressed transverse line near the base and a slightly raised 



