THE THYNNIDEOUS INSECTS OF AUSTRALIA. 141 
inner margin black ; they are furnished near the base beneath with 
a strong brush of fulvous hairs, the inferior parts of the mouth and 
the palpi are fulvous, the head beneath is black and thickly setose. 
The prothorax is dark fulvous, with the anterior margin prominent 
on each side, the tegule are fulvous, the mesonotum is black, with 
the lateral margins rather elevated and two impressed iongitudinal 
lines coated with short fulvous down; the scutellum is brunneous 
and elevated in the middle into two slightly conical tubercles, the 
metanotum is black, minutely punctured and densely clothed with 
fine gray hairs. The abdomen is nearly as long as, but narrower 
than, the head and thorax, it is elongate-ovate, convex above, black, 
shining, and scarcely punctate, the basal joint rather abruptly 
deflexed to the place of its insertion, and with a brush of gray hairs 
on each side; the seventh segment is abruptly deflexed, striated and 
‘truncated, the last ventral segment terminated in an obtuse deflexed 
and curved point (fig. 14, 1¢). The femora and tibiz are dark 
chesnut, the posterior pair of the former angulated in the middle of 
the hind margin and terminated below in a spine; the tarsi are 
paler, the posterior pair being twice as long as the tibize, the basal 
joint of the anterior tarsi is coated with short silver gray hair on 
its outer edge. The wings are large and stained deep yellow, with 
brown veins and stigmata; the supplemental vein in the first sub- 
marginal cell is very slender; the body beneath is black, finely 
punctured and thickly pubescent ; the anterior coxze and the bifid 
point of the mesosternum brunneous ; the latter is marked with 
three longitudinal impressed lines, which do not reach the anterior 
margin. 
THYNNUS GRAVIDUS, Westw. 
(Plate 82, fig. 3.) 
Q_ Th. niger, antennis mandibulis prothorace scutello pedibusque rufo-castaneis, abdomine 
maximo flavo fasciato. Long. Corp. lin. 14. 
JJabitat in Nova Hollandia. Mus. Hope. 
The large size of this insect, together with its peculiar colouring 
and the structure of its hind femora, induce me to think it probable 
that it may be the female of Th. Klugii. 
The head is small, black, and convex above, the sides and hind 
margin being nearly straight, with the angles rounded off: it is 
thickly punctated, especially in front where it is produced into a 
bifid tubercle, at the sides of which the antenne are inserted; these, 
judging from the two basal joints, are fulyous brown, as is also the 
