116 
HOWLAND E. TURNER 
Hab. Cooktown, Queensland. 
Type in Hungarian National Muzeum. 
Somewhat intermediate between Thynnus of the typical dentatus 
group and Ashmead’s group Zaspilothynnus , but rather nearer to 
the latter. 
Thynnus Cookii sp. nov. 
5 . Clypeus without a carina, broadly truncate at the apex. Head 
smooth and shining, microscopically punctured on the vertex, nearly 
half as broad again as long, rounded at the posterior angles, a large 
deep depression on each side on the front extending to the eyes, but 
not nearly reaching the posterior margin of the head, the depressions 
separated by a narrow elevated carina which is a little broadened pos¬ 
teriorly and thinly clothed with long hairs. Pronotum twice as broad 
as long, the anterior margin almost straight, smooth and shining, with 
a row of setigerons punctures on the anterior margin, a little narrower 
than the head. Scutellum twice as broad as long, about one third 
shorter than the pronotum, smooth and shining, with a few large seti¬ 
gerons punctures in the middle, Median segment sparsely punctured, 
much shorter than the scutellum and very sharply sloped posteriorly. 
Abdomen much broader than the thorax, smooth and shining with a 
few scattered punctures ; the first dorsal segment with the apical 
margin raised, a deep groove before it and a very small patch of short 
hairs on the middle close tho the apex ; second segment with about 
seven strong transverse carinæ, the two basal ones the lowest; pygi- 
dium vertically truncate posteriorly, sharply narrowed before the trun¬ 
cation, the narrowed portion transversely striated ; the surface of the 
truncation elongate ovate, the dorsal plate much shorter than the ven¬ 
tral, trilobed at the apex, the middle lobe the longest, the ventral plate 
with a small and shallow emargination at the apex. Fifth ventral seg¬ 
ment coarsely longitudinally striated. Fusco-ferruginous ; the vertex 
narrowly continued to the eyes, the apex of the mandibles and the 
median segment black; the frontal depressions, cheeks, pronotum, ex¬ 
cept the posterior margin, scutellum, a transverse band near the base 
on the first and second dorsal segments, a transverse band near the 
apex of the third segment, two small spots on each side of the fourth 
and one on each side of the fifth, a triangular spot at the apex of the 
first ventral segment, a broad arched band on the second, an inter¬ 
rupted band on the third and fourth, the coxae beneath and the tibiae 
above yellow. 
Length 12 mm. 
