HYMENOPTERA. 13 



5. Thynnus confusus. B.M. 



Male. Length 8| lines. — Closely allied to T. variabilis, but 

 apparently a very distinct species. Black : the orbits of the 

 eyes, interrupted at their summit, the mandibles, clypeus, and 

 scape of the antennae in front, yellow. Thorax : the anterior 

 and posterior margins of the prothorax, the tegulae, a spot 

 beneath the wings, an escutcheon-shaped spot on the scutellum 

 and post-scutellum, yellow; the wings fulvo-hyaline ; the legs 

 fulvous, with the coxae spotted with black and pale yellow. 

 Abdomen cylindrical, truncated at the base ; the first segment 

 with a large transverse macula on each side, the following seg- 

 ments with a double row of ovate spots on each side ; beneath, 

 the basal segment pinched in the middle into a sharp central 

 yellow carina, the second segment almost entirely yellow ; the 

 following segments with a large transverse macula on each side, 

 each macula with a crescent-shaped black mark behind ; the 

 apical ventral plate terminating in a narrow style, which has a 

 sharp spine at the apex. 



Hah. Australia. 



This species has a resemblance both to T. variabilis and T. 

 affinis; the form of the abdomen, however, is like that of T. 

 Shuckardi, being cylindrical and regularly tapering to its apex ; 

 but the narrow terminal style at once separates it from both the 

 allied species. 



6. Thynnus obscuripennis. 



Thynnus obscuripennis, Gue'r. Voy. Coq. Zool. ii. 227 3 • 

 Klug, Berl. Abhandl. (1842) 18. 8. 



Hab. Australia. 



7. Thynnus rufiventris. B.M. 



Thynnus rufiventris, Guer. Voy. Coq. Zool. 227 8 • 

 Klug, Berl. Abhandl. (1842) 19. !>. 



Female. Length 7-9 lines. — Yellow above, the mandibles 

 ferruginous; the thorax at the sides and beneath dark fusco- 

 ferruginous, sometimes black ; the prothorax above, the posterior 

 margin of the mesothorax, the margins of the scutellum and the 

 metathorax behind, blackish ; the legs ferruginous, with the coxae 

 black. The abdomen dark rufo-piceous beneath ; the margins 

 of the segments above, and a central line on the third, fourth, 

 and fifth, black or rufo-piceous; the second segment with a 



