A DECADE OF AUSTRALIAN THYNNIDEOUS INSECTS. 117 
head is of moderate size, black, and finely punctured; the hind 
margin with a slender yellow line, which extends behind the 
eyes, where it is dilated on each side; there is also a small yellow 
patch extending from the upper angle of each eye towards the 
ocelli; there is also a yellow patch between the antenne at the 
base, these being rather wide apart. The clypeus is oval and 
yellow ; the apex narrow and rather rounded ; the space between 
its sides and the inner margins of the eyes is depressed and yellow, 
with a small black dot. The mandibles are yellow, with the tips 
black; the basal piece of the maxille and the mentum are black ; 
the former scarcely hairy. The terminal sixth joint of the palpi 
appears to have been broken off in both the palpi in my specimen ; 
the terminal joint of the labial palpi is slenderer and longer than 
the preceding jomt. The antennee are rather slender and filiform, 
being four lines long ; they are entirely black, whereas T. variegatus 
has the basal joint yellow. The pronotum is margined entirely 
with a rather narrow edge of yellow; the dise of the mesonotum 
is black, with four impressed lines and a yellow patch behind, and 
a slender lateral lne; the wing-covers are also yellow; the 
seutellum is black, with a yellow lunule across the middle, pointed 
in front ; behind this is a slender yellow curved line, united with 
two lateral yellow spots; and the metathorax has three yellow 
spots, the central one largest and dilated in front. The surface 
of the thorax is finely punctured, and slightly pilose; the prosternum 
bears two yellow spots, and the sides of the mesosternum two 
fulvous ones beneath the insertion of the fore wings; this part is 
also clothed with fulvous pubescence. The abdomen is elongate, 
ovate, with the tip acute; it 1s pale-yellow coloured, the basal joint 
above with a small conical spot, two minute dots, and the hinder 
margin of black. The three followmg segments are marked with 
black transverse bars, the extremity of one and the base of the 
next being narrowly marked with this colour; the middle of the 
inner edge of these bars is rather produced in front ; the following 
segments are black ; the fifth and sixth marked with yellow lateral 
lunules; the basal segment of the abdomen beneath is conically 
elevated, and the other segments are coloured as above, the black 
margin of the second and third joints being very narrow; the 
anal segment is entire, but terminated by a minute slender acute 
point. The coxze are yellow, with black marks; the trochanters 
black, the femora yellow, with the disc and apex black, the fore 
edge of the anterior and middle pairs being more chesnut, which 
