113 
PLATES LXXVr and LXXVII. 
A DECADE OF AUSTRALIAN THYNNIDEOUS INSECTS. 
Having 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 BROWNII. 
(Plate 76, fig. 1 and details.) 
T. niger capite ct tliorace opacis, fulvo tomentosis et tnaculatis ; abdominc flavo maculate, 
segmento ultimo oranino flavo, antennis lotigis apicc gracilUmis, pedibus castaneo-rufis $. 
Long corp. lin. 14^ ; Expans, alar, lin. 27. 
The head is black above, finely punctured, and clothed with 
fulvous pubescence, with a slender yellow sti’eak 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 antennm, where it is 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 antennm 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 maxillse are also 
clothed with numerous long hairs. The inaxillm and mentum 
(except at the base), as well as the palpi, are fulvous. The 
antennte 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 bx’oadly fulvous; 
the dorsum is maiked with four impressed longitudinal lines 
NO. XX. — 1st JULY, 1844. 
I 
