BY ROWLAND E. TURNER. 271 



$ 5 . i. Head very much broader than prothorax, as broad as long 

 or broader. 

 a. Pygidium broadly transversely truncate at apex. 

 a'^. Ferruginous; abdomen, except pygidium, black. 



A. hicolor Erichs. 

 h'^. Wholly ferruginous-brown, A. tryphojioides Sm. 



h. Pygidium more elongate, very narrowly rounded at apex, 

 with a strong median carina, 

 a-. Dull ferruginous, abdomen black. A. blandulus, n.sp. 



ii. Head very little broader than prothorax, rather longei than broad. 



a. Wholly testaceous. A. nudulus, n.sp. 



Ariphron BicoLOR Erichs. 



Ariphron hicolor Erichs., Arch, f, Naturgesch. viii. Pt. 1, p. 264, 

 n.239,t.5,f.l, 1842(9). 



The male of this fine species is still unknown. 



A. PETIOLATUS Sm. 



Thynnus iMiolatns Sm., Cat. Hym. B.M. vii.p.36,n.94,1859((J) 



The hypopygium has a spine on each side near the base, thence 

 very narrowly produced with parallel sides to the base of the 

 apical spine. The clypeus is narrowly produced anteriorly and 

 has a carina from the base, not reaching the apex. 



9. Unknown. 



Hah. — Melbourne, Vic. (French); Hunter River, N. S.W.; 

 Cairns, Q. 



Melbourne specimens are 12-13 mm. in length, those from 

 Cairns 8-10 mm. The type is from the Hunter River, and is 

 intermediate in size. 



A. VAGULUS, n.sp. 



(J. Clypeus produced anteriorly, very narrowly truncate at the 

 apex, with a median longitudinal carina from the base to the 

 apex; the sides of the clypeus finely and densely punctured and 

 thinly covered with rather long grey pubescence. Head and 

 thorax punctured, median segment shining, sparsely and shallowly 

 punctured, longer than in A.petiolatics Sm., narrowed and rounded 

 at the apex. Abdomen slenderer than in A. lyetiolatus, the petiole 



