PLATES LXXVI ann LXXVII. 
A DECADE OF AUSTRALIAN THYNNIDEOUS INSECTS. 
——— 
Havine obtained, since the publication of the preceding number 
of this work, a considerable number of new species of Thynnideous 
insects from Australia, I hasten to illustrate some of the more 
conspicuous, confining myself here to those of the male sex, 
not deeming it advisable to describe the females as distinct species, 
which may probably prove to be the opposite sexes of individuals 
now illustrated. 
THYNNUS BROWNIL. 
(Plate 76, fig. 1 and details.) 
T. niger capite et thorace opacis, fulvo tomentosis et maculatis ; abdomine flavo maculato, 
segmento ultimo omnino flavo, antennis longis apice gracillimis, pedibus castaneo-rufis 4. 
Long corp. lin. 144; Expans. alar. lin. 27. 
The head is black above, finely punctured, and clothed with 
fulvous pubescence, with a slender yellow streak behind each eye, 
and two small triangular yellow dots behind the ocelli; the clypeus 
is prominent, convex, and yellow, the extremity terminating in a 
semicircular curve, not entirely concealing the ciliated labrum. It 
is yellow, which colour ascends in an oval patch as high as the base 
of the antenne, where it 1s marked with a black line, which ter- 
minates in a conical chesnut-coloured central spot. The margins 
of the eyes and the tubercles on which the antenne arise are also 
yellow. The mandibles are yellow, with the tips of the two 
teeth brown; beneath they are clothed with a very thick brush of 
black hairs; the sides of the basal part of the maxillz are also 
clothed with numerous long hairs. The maxille and mentum 
(except at the base), as well as the palpi, are fulvous. The 
antennee are long (measuring rather more than eight lines in 
length), and gradually attenuated from the middle to the apex, 
where they are very slender ; they are entirely black. The thorax 
is obscure black, and very finely punctured, and also very thickly 
clothed with short fulvescent pubescence, which becomes longer 
and greyer upon the metathorax. The collar has the anterior 
margin forming a slender raised edge, which is yellow, but slightly 
interrupted in the middle: the hind margin is broadly fulvous ; 
the dorsum is marked with four impressed longitudinal lines 
NO. XX.—Ist JULY, 1844, I 
