135 
PLATES LXXXII and LXXXIII. 
FURTHER ILLUSTRATIONS OF THE THYNNIDEOUS INSECTS OF 
AUSTRALIA. 
' The Rev. F. W. Hope having, since his return from Italy, placed 
at my disposal his collection of Thynnidas, containing several species, 
of which he had acquired both sexes from W. S. MacLeay and 
C, D. E. Fortnum, Esqrs., I am induced to add figures of these and 
some other allied insects to my previous illustrations, our knowledge 
of the true arrangement of this family depending so greatly upon 
the determination of the sexes of the different species. 
THYNNUS LEACHIELLUS, IFesiuj. 
Plate 77, fig. 1 (T. interruptus.) Plate 83, fig. 4 $. 
Both sexes of this species having been received by Mr. Hope 
from Mr, MacLeay, the female is now represented. In several 
respects it differs from the females of the more typical species; but 
as these differences appear to be of no higher than specific value, 
it is unnecessary at present to establish a separate subgenus for its 
reception. The female is black varied with yelloAV, the head black 
and shining, of nearly equal breadth with the prothorax; it has on 
each side a deep longitudinal impression, extending from the base 
of the antennae to the back part of the head, leaving the middle of 
the face much elevated. These impressions are smooth, but the rest 
of the head is punctured. The antennse are black, the mandibles 
pitchy and entire, with the tips black. The lower parts of the 
mouth are minute, the palpi of the maxillae almost obsolete and 
apparently two-jointed (fig. 4? a), and those of the labium rather 
larger and three-jointed (fig. 4 i). The prothorax is smooth, 
polished, and nearly flat on its upper side, being almost entirely, 
except along its posterior margin, occupied by a broad yellow fascia, 
bearing a short browm line in the middle; the mesothorax is short, 
narrow, and yellow, and the metathorax black, nearly as broad as 
the prothorax, angulated at the sides, and with the posterior extre¬ 
mity transversely deflexed. The legs are black, with the articula¬ 
tions pitchy and the tarsi paler. The fore tarsi are densely spinose, 
the middle tibise thick and also setose, the setm mixed with short 
spines, and the hind tarsi long, slender, and very setose. The 
