hymenoptera. 23 



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



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

 Thynnus (Thynnoides) obscui'us, Westw.Arc. Ent. ii. 139.pl. 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 71 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 ]iale downy pile ; 

 the anterior tibise 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 subtriangular 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 lanceohite 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 (Agriomyia) depressus, Westw.Arc. Ent. ii. 107. pi. 74. 



f.5c?,f.6$. 



Hab. Australia (King George's Sound). 



