THYNNUS. 167 



24. Thynnus nubilipennis. 



Male. Length 7 lines. — Black and shining, variegated with yellow, 

 the wings fnlvo-hyaline, the nervures ferruginous, a fuscous cloud 

 occupying the marginal and a portion of the second submarginal 

 cell. The mandibles, clypeus, orbits of the eyes, interrupted at 

 their summit, and a V-shaped spot above the antennae, bright yel- 

 low ; the tips of the mandibles and a transverse spot on the clypeus 

 black. Prothorax with a broad interrupted fascia at the posterior 

 margin, the fascia narrowed towards the tegulae, a quadrate spot 

 on the disk of the mesothorax, the scutellum, and a narrow line 

 running to the insertion of the wings, a large irregularly shaped 

 spot beneath them, the metathorax with an oblique stripe on each 

 side, which runs to its apex and curves up its lateral margins, yel- 

 low ; the legs pale ferruginous. All the segments of the abdomen 

 with a lateral oblong-ovate yellow spot ; beneath entirely black. 



Female. Length 5 J lines. — Black; the mandibles, anterior tibiae, 

 and all the tarsi ferruginous ; the flagellum pale ferruginous ; the 

 tibiae spinose. The thorax and legs sprinkled with pale hairs. 

 The margin of the basal segment of the abdomen, and a large, 

 oblong, transverse, subovate lateral macula yellow ; the fifth 

 segment with a narrow, lateral, transverse macula; the second 

 segment transversely grooved. 



Hah. Queensland. 



25. Thyxmus perelegans. 



Male. Length 3| lines. — Black ; the head, thorax, and abdomen 

 with bright yellow markings. The mandibles, the clypeus, two 

 united spots above the antennas, and a narrow line round the orbits 

 of the eyes, interrupted at their summit, yellow ; the head closely 

 punctured. Thorax closely and more strongly punctured than the 

 head on the pro- and mesothorax ; the metathorax more distantly 

 punctured ; the margins of the prothorax broadly yellow ; a quad- 

 rate spot on the disk of the mesothorax, the scutellum, and post- 

 scutellum, yellow, as well as the apical portion of the metathorax, 

 which has a narrow black line in the centre ; the legs pale ferru- 

 ginous, with the tips of the joints yellow, and the base of the pos- 

 terior tibiae black ; wings hyaline, the nervures pale ferruginous. 

 Abdomen shining, the margins of the segments depressed ; the 

 first to sixth segments with a large lateral, oblong-ovate, yellow 

 macula, the maculae with a small notch on their upper margins. 



Hah. Queensland. 



26. Thynnus simplex. 

 Male. Length 6| lines. — Black ; the abdomen with a double row 



