THE THYNNIDEOUS INSECTS OF AUSTRALIA. 143 
THYNNUS PURPURIPENNIS, Westw. 
(Plate 83, fig. 1.) 
Th. niger nitidus griseo parum setosus, abdomine elongato subdepresso, alis nigricantibus 
purpureo-nitidis, 
Long. corp. lin. 12. Expans. alar. lin. 20. 
Habitat in Nova Holland. Mus. D. Turner. 
This very distinct species is entirely of a black colour, more or 
less clothed with fine silvery pubescence, especially on the under 
side of the body and face. It is of a long and narrow form, 
almost approaching that of the males of Rhagigaster. The head 
is strongly punctured with a wide but slight tubercle in front, at 
the sides of which the antennz are placed; the clypeus is long 
and truncate, concealing the labrum; and the mandibles are 
eurved, rather slender, and with a tooth within near the tip, 
clothed on the under-side with long slender hairs; the antennz are 
slender, pointed at the tips, and scarcely longer than the thorax ; 
the maxillary palpi are six- and the labial four-jointed. The 
thorax is finely punctate; the scutellum convex and slightly 
elevated, and the metathorax elongated. The abdomen is long 
and sub-depressed, each segment (except the first and last) with a 
rather deep transverse impression across the base, and with the 
lateral portion of each towards the hind margin more convex, 
so as to render each segment more convex just preceding the 
posterior margin. The sixth segment is armed with a small 
tooth on each side at the extremity, and the anal segment is ter- 
minated by an obconical, flattened horn, finely pointed at its tip 
(fig. 1b, 1c); the wings are black, with a fine purple gloss, and 
the tips rather lighter coloured. The legs are black; the inter- 
mediate segments of the abdomen beneath are marked with a 
transverse slender impressed line near the base. 
ENTELES, Westw. 
Subgenus novum characteribus feemineis adhuc tantum distinguendum, Thynnis typicalibus 
valde affine sed palpis perfectis gaudens. 
Caput mediocre subquadratum convexum; mandibule integree curvate imberbes. Labrum 
clypeo haud absconditum (fig. 4 a). Maxille (fig. 4 6) perfecte palpis forme ordinarie 
6-articulatis. Mentum elongatum (fig. 4 c) basi attenuatum supra longitudinaliter cari- 
natum, labio omnino retracto, palpis labialibus perfectis 4-articulatis. Thorax tripartitus 
apterus. Abdomen magnum conyexum, segmento secundo supra striolato apicali obtuse 
truucato (figs. 4 d, 4). Pedes robusti setosi fossorii unguibus apice bifidis. 
