110 SPECIES OF AUSTRALIAN THYNNIDEOUS INSECTS. 
terminates above (beneath the insertion of the antennz) in three 
red points; in the middle, near the front margin, is a deep 
impressed dot ; the mandibles are black, with the outsides yellow ; 
the two tubercles on which the antennz are placed are red on the 
inside ; the head has a small yellow dot behind, in the middle. 
The collar has a yellow elevated carina in front, and a small yellow 
dot at each lateral angle, behind; the metathorax has a large 
yellow spot in the middle, a smaller one on the scutellum, a short 
yellow line behind the latter, and a yellow dot on each side, above 
the insertion of the hind wings ; the tegulz are also yellow; there 
is also a yellow spot on each side, beneath each wing ; the abdomen 
is black, the first segment above with two minute yellow dots, the 
four following with a yellow, elongated, transverse patch on each 
side, having a notch in front, near the side, and having the inner 
extremity produced into a reflexed, yellow tooth ; the basal segment 
of the abdomen beneath is produced into a very prominent, yellow, 
conical point ; the three following segments bear a large transverse 
yellow spot (inclosing a black mark), and the fifth segment two 
minute oblique yellow dots. The legs are fulvous red, and the 
wings hyaline, slightly tinged with yellowish, with a chesnut- 
coloured stigma; the abdomen is terminated by an oval, flattened 
plate, with the tip acute. 
The female has the head fulvous red, considerably dilated in 
front, impunctate, with dark fulvous antennz and mandibles, the 
latter black at the tips; the thorax is black and punctured, the 
anterior division longitudinally channelled ; the abdomen is fulvous 
red, with the base and middle black. The second segment has 
three strongly carinated lines across the middle; the third and 
fourth have respectively an impressed line across, near the base, 
and another (bi-emarginate) towards the apex. The legs are 
fulvous, very much ciliated, and the cox are darker coloured. 
Fig. 3.@ represents the front of the head of the male; 3 b, the bilobed labrum; 3c, the 
maxilla; 3@, the labium ; and 3 e, the extremity of the abdomen of the male. 
Fig. 4 a, the very deeply ciliated labrum of the female; 4, the mandible ; 4c, the maxilla, 
with its very minute palpus; 4 d, the labium, with its palpus d *. 
The plant represented in Plate 75 is the Australian Dillwynia 
ericifolia. 
