THYNtfUS. 161 



beneath, the basal segment with a small white tubercle ; the second 

 segment with two large spots and two smaller lateral spots, all 

 being more or less united ; the third and fourth segments have 

 each four separated spots. 



This species is very like Thynnus strenuus, but its markings are 

 white and different, and its legs are black. 



Hah. Adelaide. 



9. Thynnus tuber culifrons. 



Male. Length 7 lines. — Black, with the mandibles, clypeus, and 

 inner orbits of the eyes, as high as the antennae, yellow; between 

 the antennae there is a blunt tubercle, which a yellow carina unites 

 with the clypeus. Thorax closely punctured, the metathorax finely 

 so, and with a thin hoary pubescence ; wings hyaline, the nervures 

 black ; the tips of the joints of the tarsi ferruginous beneath. Ab- 

 domen oblong, narrow, smooth, and shining, with fine distant 

 shallow punctures; the margins of the segments depressed; the 

 apical segment strongly punctured. 



Hah. Swan River. 



10. Thynnus suspiciosus* 



Male. Length 7 j lines. — Black ; head and thorax with yellowish- 

 white markings, abdomen with sub ovate maculae on the segments 

 above and beneath. The mandibles, clypeus, the inner margin of 

 the eyes a little higher than the insertion of the antennae, two 

 small ovate spots between them, and an interrupted line behind 

 the eyes yellowish white. The anterior and posterior margins 

 of the prothorax, the tegulae, a spot on the scutellum, the post- 

 scutellum, the lateral margins of the metathorax, and an oblong 

 spot in the middle pale yellow; wings subhyaline, the nervures 

 obscure fusco-ferruginous. The basal and four following segments 

 of the abdomen with large subovate, lateral, pale yellow maculae, 

 those on the basal segment almost confluent; the sixth segment 

 with a minute lateral spot ; beneath, the second to fourth segments 

 with ovate lateral maculae. 



Hah. Swan River. 



11. Thynnus vividus. 



Male. Length 5^-6 lines. — Black ; the head and thorax with yellow 

 spots, the abdomen with yellow fasciae. The clypeus, two minute 

 spots between the antennae, and the base of the mandibles yellow ; 

 the latter ferruginous towards the apex. The anterior elevated 

 margin of the prothorax, its posterior margin very narrowly, 

 more or less interrupted in the middle, a large subquadrate spot 



