Aculeate Hymenoptera. 233 



the other portion with a thin covering of cinereous 

 pubescence, which is more dense and glittering at the 

 sides ; beneath punctured, and with a thin short cinere- 

 ous pubescence. 

 Hab. Melbourne. 



4. Thynnus co7ispicuus. 



Male. Length 8-9 lines. Black : with red and yellow 

 mai-kings. Head: rugose; the clypeus, a spot at the 

 base of the mandibles, the margin of the elevation be- 

 neath which the antennae are inserted, and a narrow 

 yellow line behind the eyes at the lower part of their 

 orbits, yellow. Thorax : rugose, and with a thin hoary 

 pubescence ; the prothorax above, and a quadrate spot 

 on the mesothorax, ferruginous ; a black macula on 

 each side of the prothorax, and a minute spot on the 

 margin in front ; a spot on the scutellam, the post-scu- 

 tellum, and two ovate spots on the metathorax, yellow ; 

 the tips of the joints of the legs and of the tarsi, ferru- 

 ginous ; wings hyaline, with a slight yellow tinge. 

 Abdomen smooth and shining ; the first segment with a 

 minute spot on each side, and the four following seg- 

 ments, with an interrupted yellow fascia in the middle, 

 each narrower than the preceding ; beneath, the second, 

 third, and fourth segments have an interrupted white 

 fascia. 



Hab. South Australia. 



In the British Museum. 



5. Thynnus inipetuosus . 



Male. Length 1 inch. Black : the abdomen with sil- 

 very-white fasciae. Head as wide as the thorax, and 

 shining; the anterior margin of the clypeus, the mandi- 

 bles, and a V-shaped mark above the insertion of the 

 antennae, yellow; the upper portion of the clypeus and 

 tips of the mandibles ferruginous; the face and cheeks 

 with silvery-white pubescence. Thorax: above, slightly 

 shining, the scutellum roughly punctured, the metathorax 

 clothed with long white pubescence, and transversely 

 rugose ; wings fusco-hyaline, with a darker fuscous stain 

 traversing the nervures, which are black ; the thorax with 



