26 hymenoptera. 



66. Thynnus (Agriomyia) inconstans. B.M. 



Male. Length 8i lines. — Black : head and thorax covered 

 with cinereous down)' pubescence, that on the vertex and disk of 

 the thorax shghtly fulvous ; the clypeus and mandibles yellow, 

 usually with ferruginous stains. Thorax : a minute yellow dot 

 on the scutellum and post-scutellum ; the legs ferruginous ; the 

 coxse, trochanters, and femora above, fuscous or black ; wings 

 hvaline, the nervures black, becoming ferruginous at the base of 

 the wings. Abdomen ferruginous, the basal and apical margins 

 of the segments black or fuscous ; a black, fuscous, or ferruginous 

 line down the centre, forming, as it were, large ovate ferruginous 

 spots on the segments on each side ; some examples have the 

 abdomen ferruginous, with large undefined spots on each side ; 

 sometimes the spots are yellowish, or the abdomen is dark fusco- 

 ferruginous and the spots yellowish. 



Hab. Australia. 



67. Thynnus (Agriomyia) albo-pictus. B.M. 



Male. Length 7 lines. — Black : the clypeus, mandibles, orbits 

 of the eyes broadly, and a line ti-acing a bell-shaped form before 

 the anterior stemma, white ; the orbits of the eyes interrupted 

 at their summit. The margins of the prothorax, a square spot 

 on the mesothorax, the tegulse, a broad stripe on the scutellum 

 and a spot before its basal angles, the post-scutellum uniting 

 with a spot beyond it, and the metathorax, except its extreme 

 base, white ; two large irregular-shaped spots beneath the wings ; 

 the coxae and femora beneath white ; the coxae spotted with 

 black ; the anterior and intermediate tibiae and tarsi ferruginous ; 

 wings hyaline, with blackish nerviu-es. Abdomen : each segment 

 with a very broad white fascia, the basal one narrowly interrupted, 

 the following with a narrow central black line near their poste- 

 rior margin and a minute notch anteriorly towards the lateral 

 margins ; beneath, white, with narrow black margins to the seg- 

 ments, the basal one produced into a conical tooth. 



Hab. Australia (Swan River). 



68. Thynnus (Agriomyia) luctuosus. B.M. 



Male. Length 7-8 hues.— Jet-black : the abdomen shining; 

 the head and tliorax covered with confluent punctures and sub- 

 opake ; the sides and beneath with thin long cinereous pu- 

 bescence ; the anterior margin of the face and clypeus, a minute 

 spot in the middle of the latter, a spot at the base of the man- 

 dibles, and a short narrow line on the lower part of the outer 



