114 
ROWLAND E. TURNER 
Thynnus rufoluteus sp. nov. 
5 . Clypeus shert broadly truncate at the apex, without a carina, 
sparsely punctured. Head smooth and shining, subrectangular, nearly 
twice as broad as long, slightly rounded at the posterior angles ele¬ 
vated longitudinally and narrowly in the middle on the front, with a 
large subconcave depression on each side extending from the base of 
the antennae almost to the posterior margin of the head and to the 
eyes. Pronotum as broad as the head, more than twice as broad as 
long, the sides almost parallel, very sparsely punctured, with a few 
large setigerous punctures on the anterior margin. Scutellum short and 
rather broad, shining and almost without punctures ; the median seg¬ 
ment much shorter than the pronotum, slightly widened from the base 
and obliquely sloped posteriorly, subopaque and very finely and shal¬ 
lowly punctured. Abdomen much wider than the thorax, shining and 
very sparsely punctured; the first segment truncate at the base, the 
surface of the truncation concave with a median longitudinal sulcus, 
a sparse row of whitish hairs above the base of the truncation, the 
apical margin of the segment raised, with a deep transverse groove 
behind it; second segment with about seven raised transverse carinæ 
including the raised apical margin, the three basal carinæ low and 
near together, the three apical high and further apart. Pygidium 
truncate posteriorly, sharply contracted and very narrow before the 
truncation, the sides of the narrow portion raised into convergent 
carinæ, the surface of the truncation small, broadly oval, the dorsal 
plate broadly triangular, only half as long as the ventral plate, the 
sides raised, two obscure longitudinal carinæ from the base not 
reaching the apex; the sides of the ventral plate of the pygidium are 
minutely and not very distinctly serrated. Fifth ventral segment coar¬ 
sely longitudinally striated. Tibiae pubescent, the intermediate and pos¬ 
terior pair broadened and spinose, but less strongly so than in most 
of the allied species. Tarsal ungues bifid. 
Bright ferruginous ; the median segment fusco-ferruginous ; the 
first dorsal segment of the abdomen except the apical margin bright 
yellow; the tibiae above pale dull yellow. 
Length 10 mm. 
Hab. Cooktown, Queensland. 
Type in Hungarian National Museum. 
This species approaches nubilipennis group but differs from it 
widely in the form of the pygidium ; the minute serration of the sides 
of the ventral plate is a character I have not yet seen in any other 
