A DECADE OF AUSTRALIAN THYNNIDEOUS INSECTS. 115 
of the face, at the sides of which the anienne are affixed ; these 
are short (four lines long), filiform, and black. The elypeus is 
rather prominent, oval, convex, and yellow, with the lower margin 
truncate, and nearly concealing the labrum; the mandibles are 
slender, yellow, with the tips brown, the underside sparingly 
furnished with long hairs. The maxilla, mentum, and palpi, are 
pitchy-black ; these do not differ in structure from the details of 
fig. 1, except that the maxille are more slightly furnished with 
hairs at the sides. The thorax is entirely black, and finely pune- 
tured ; it is clothed with short gray pubescence, both above and 
beneath, the metathorax being more thickly covered with longer 
white woolly hairs; the wing-scales are black, as is also the 
abdomen, which is long, obconical-ovate, and finely punctured, 
each segment having a stronger row of punctures near its posterior 
margin; the terminal joint beneath is prominent, deflexed, trans- 
versely striated, and produced into an acute point at the tip, each 
side at the base being dilated into a small conical tooth; the 
basal segment beneath is carmated down the middle. The legs are 
black, with the tibiee and basal joints of the tarsi pitchy-brown, 
clothed with fine grey pubescence, the tibize being slightly rugose, 
the tarsal ungues are fulvous at the base. The wings are stained 
with yellowish brown, which is deepest coloured in the marginal 
and first submarginal cells. The costa is black. 
Inhabits King George’s Sound. In Mus. Westw. 
I should have considered this to be Thynnus flavilabris, were 
not that species described as having the pubescence of the head 
and prothorax “d'un jaune fauve,” the legs as entirely black, 
except the ealcaria and tarsal ungues, and the size much exceeding 
that of my insect, being twenty-six millemetres, or thirteen lines, 
in length. 
THYNNUS INTERRUPTUS. 
(Plate 77, fig. 1, and details.) 
T. niger levis, capite thoraceque flavo-variis, abdomine fasciis sex tenuissimis flavis, medio 
interruptis, pedibus fulvis ¢. 
Long. corp. lin. 133. Expans. alar. lin, 22. 
The head is very finely punctured, and black, with a small 
yellow V like mark in the middle of the face, beneath which, on 
each side, is a deep black excavation, within which the antennze 
are affixed; the clypeus is large, prominent, yellow, and shining, 
produced into a conical point above, and with the anterior margin 
straightly truncate, nearly concealing the labrum (fig. 1 a), which 
I 2 
