170 



TIlYNNin.K. 



'i'2. Thynnus medius. 



Male. Lcngtli (Ij lines.— IJlack: the clypcus and mandibles yellow, 

 a transverse black lino on tlio former, and the tips of the latter, 

 black. Thorax very closely punctured; the elevated anterior 

 niarj^in of the protliorax, the te?;ula?, a 8i)ot on the scutellum, and 

 the postscuteUuni, yellow; the legs ferruginous; the pubescence j 

 beneath, and also that on the metathorax, thin and hoary ; wings 

 hyaline, the nervures ferruginous. Abdomen shining and with 

 shallow punctures ; the apical margins of the segments depressed ; 

 the first segment with a minute lateral pale yellow spot ; the four 

 following Avith oblong lateral macular about the middle of the seg- 

 ments, those on the second segment are largest and irregularly i 

 ovate ; on the two following segments the macultc taper inwardly, 

 those on the fifth segment are very narrow ; the apical ventral 

 segment is lanceolate, and has a minute tooth at the apex ; beneath, 

 the second, third, and fourth segments have two central, sublunate, 

 pale yellow spots, and also a minute subovatc spot laterally. 



Hah. Australia. 



33, Thynnus flavovariegatus. 



Male. Length 5| lines.— Black, and much variegated with yellow ; 

 the anterior wings clouded at their apex. The mandibles, clypeus, 

 orbits of the eyes (interrupted above), a spot above each antenna, 

 and two small ovate ones on the vertex, yellow ; the clypeus bi- 

 dentate anteriorly ; the scape in front, and the apex of Ihe joints 

 of the antennae, yeUow. The margins of the prothorax, the tegula), 

 a furcate spot on the mesothorax, two ovate ones on the scutellum, 

 the postscuteUum, and two longitudinal stripes on the metathorax, 

 which curve up its lateral margins, yellow ; a large oblong spot 

 beneath the wings, and the coxa) beneath, yellow ; the legs ferru- 

 ginous ; wings hyaline and iridescent, the nervures ferruginous. 

 The first four segments of the abdomen with a yellow fascia on 

 their apical margins, each fascia with a transverse dark line that is 

 interrupted in the middle ; beneath, the second, third, and fourth 

 segments with yellow fascise. 



JIab. Australia. 



34. Thynnus fastuosus. 



Male. Length 4| lines. — Black ; the head and thorax variegated 

 with yellow, a fuscous cloud in the marginal cell of the anterior 

 wings, and the abdomen with five yeUow fascia). The clypeus, the 

 inner orbits of the eyes, a line behind them which runs along 

 the hinder margin of the vertex, and two minute spots above the 

 antennae, yellow. The margins of the prothorax (the anterior one 

 slightly interrupted), a square spot on the mesothorax, a broad 

 margin on the scutellum, the postscuteUum, a line continued to 



