HYMENOPTERA. 23 



48. Thynnus (Thynnoides) obscurus. B.M. 



Thynnus obscurus, King, Berl. Abhandl. (1842) 22. 14. f. 4 <? . 

 Thvnnus (Thynnoides) obscurus, Westw. Arc. Ent. ii. 139. pi. 82. 

 f . 2 ? . 



Hab. Australia. 



49. Thynnus trochanterinus. B.M. 

 Thynnus trochanterinus, Westw. Arc. Ent. ii. 116. pi. 77. f. 3(? . 

 Hab. Australia (King George's Sound). 



50. Thynnus (Thynnoides) basalis. 



Male. Length 7\ lines. — Head, thorax, legs, and basal seg- 

 ment of the abdomen black, the rest of the segments of the 

 latter red ; the mandibles, clypeus, and orbits of the eyes yellow, 

 the orbits black at their summit. The head and thorax covered 

 with pale pubescence, and the legs with short pale downy pile ; 

 the anterior tibiae in front and the apical joints of the tarsi ferru- 

 ginous ; the wings slightly coloured, with the nervures dark 

 brown. Abdomen rather strongly punctured, the margins of the 

 segments slightly constricted, and each with a transverse im- 

 pressed line at its base ; beneath regularly punctured, the margins 

 of the segments fringed with pale hairs. 



Hab. Australia (Swan River). 



51. Thynnus (Thynnoides) carbonarius. B.M. 



Male. Length 8 lines. — Black : head and thorax very closely- 

 punctured and subopake ; abdomen as long as the head and 

 thorax, punctured, closely so at the base of the segments, and 

 much more distantly so towards their apical margins ; the apical 

 segment with a central produced subtriarigular process at its base, 

 longitudinally striated, beneath which it is transversely striated ; 

 beneath finely and very closely punctured ; the sixth segment 

 with a small tooth on each side of its apical margin; the seventh 

 segment terminating in a lanceolate spine, which has a small 

 tooth on each side of its base ; the spine is transversely striated 

 above at its base and flattened. 



Hab. Australia (Adelaide). 



52. Thynnus (Agriomyia) depressus. B.M. 



Thynnus (Agriomvia) depressus, Westw. Arc. Ent. ii. 10/. pi. 74. 

 f.5<J,f.(>?. 



Hab. Australia (King George's Sound). 



