116 A DECADE OF AUSTRALIAN THYNNIDEOUS INSECTS. 
appears to be bilobed. The eyes are margined with yellow. The 
mandibles are long, slender, and yellow, with the tips brown, the 
inner edge very slightly setose. The maxillary palpi are broken in 
my specimen. The antenne are short, filiform, and black. The 
thorax is robust, black, polished, and very finely punctured. The 
prothorax has a very slender yellow raised anterior margin, inter- 
rupted with black in the middle; the posterior margin is more 
broadly margined with yellow, which extends only to the wing- 
scales, which are also yellow. The metathorax is marked with four 
deeply-impressed lines, having a yellow spot in the middle. The 
scutellum is black at the base, with a broad yellow lunule, with a 
separate yellow spot at each side ; near its anterior angles, behind 
the scutellum, is another slender yellow lunule, and two lateral 
yellow spots, and the metathorax is nearly occupied by a large 
angulated yellow spot, which is narrowed behind ; its lateral edges, 
which are very prominent, being also yellow; each side of the 
mesothorax is marked with two yellow spots beneath the base of the 
wings. The abdomen is elongate-ovate, convex, black, very finely 
punctured ; each of the six anterior segments with a slender trans- 
verse yellow fascia across the middle, interrupted down the centre 
of the abdomen ; the penultimate joint beneath is armed with two 
prominent tubercles (fig. 1c), and the terminal joint is elongate, 
lanceolate, the tip acutely pointed, and the base on each side pro- 
duced into a short point (fig. 1 4). The intermediate segments of 
the abdomen beneath are fulvous, with a slender interrupted trans- 
verse fascia on the hind margin. The legs are fulvous; the anterior 
coxe large, flat and yellow; the inner edge produced into a narrow 
piece, which at first sight appears distinct ; the mesosternum is 
also produced behind into two yellow points, which appear like a 
pair of supplemental coxze. The basal segment of the abdomen 
beneath is conically carinated. 
Inhabits New Holland. In Mus. Brit. et Westw. 
I have adopted the MS. name attached to this species in the 
British Museum cabinet. 
THYNNUS TROCHANTERINUS, Westw. 
(Plate 77, fig. 3.) 
T. capite et thorace nigro et pallide flavo-variis, abdomine pallide flavo, nigro cingulato, femoribus 
flavis basi et apice nigris tibiis tarsisque castaneis @. 
Long. corp. lin, 83. Expans. alar. lin. 14. 
This species is nearly allied to Th. variegatus, Klug, but much 
larger, and with different coloured scutellum and feet. The 
