234 Mr. Frederick Smith on 



a shortish hoary pubescence. Abdomen shining; the 

 apical margins of the segments with a narrow fringe of 

 silvery pubescence, the abdomen not truncate at the base, 

 but, as well as at the ajiex, pointed. 



Hab. South Australia (Hunter River ?). 



In the British Museum. 



6. Thynnus audax. 



Male. Length 1 inch. Head and thorax black, ab- 

 domen ferruginous, the insect adorned with yellow mark- 

 ings. Head and thorax with a golden yellow pubescence ; 

 the clypeus, cheeks, mandibles, and orbits of the eyes, yel- 

 low. Thorax: the prothorax, scutellum, post-scutellum, 

 metathorax, the tegulte, and two oblique lines on the 

 mesothorax, yellow; the legs ferruginous; wings fulvo- 

 hyaline, nervures ferruginous towards the apex of the 

 wings, but becoming fuscous towards their base. Abdo- 

 men : ferruginous, with an ill-defined ovate spot on each 

 side of each segment, the spots pale ferruginous, irregu- 

 larly bordered with a narrow yellow line ; the basal seg- 

 ment has on each side a small black ovate spot, and also 

 a short line near its apical margin ; beneath, mottled with 

 yellow. 



Hab. Australia. 



In the British Museum. 



7. Thynnus seductor. 



Male. Length 9? lines. Head and thorax black, the 

 abdomen yellow with black fascia. Head : the clypeus 

 and mandibles bright yellow, the latter black at their tips ; 

 the antennae as long as the thorax. The thorax roughly 

 punctured; beneath, at the sides, and also the meta- 

 thorax, thickly clothed with long cinereous pubescence ; 

 the anterior margin of the thoi'ax raised, the margin 

 slightly incurved; the wings fuscous, the nervures black. 

 Abdomen : about the same length as the head and thorax ; 

 yellow, with the apical margins of the segments bordered 

 with a narrow black band, each band runs into a small 

 black notch in the middle, between which and the lateral 

 margins, on each side, it is abruptly widened, and again 

 abruptly narrowed, thus forming an oblong broader mar- 



