NEW SPECIES OF THYNNIDÆ. 
117 
Hab. Cooktown, Queensland. 
Type in Hungarian National Museum. 
This species is very near the typical dentatus group of Thijnnus. 
Thynnus Brenchleyi Sm. 
Thynnus Brenchleyi Sm. in Brenchley’s Cruise of the Curaçoa p. 456. 
(1873) d 1 . 
A specimen in the Hungarian Museum from Cooktown differs from 
the typical form in colour, having the mesonotum, except the spaces 
between the parapsidal furrows, the scutellum and the dorsal abdomi¬ 
nal segments, except the extreme apical margins ferruginous brown; 
the postscutellum and median segment yellow. The hypopygium is 
shaped as in type, being truncate at the base of the apical spine, not 
conical as in some specimens from Mackay which I refer to the same 
species. A female from Cooktown in the collection does not differ 
appreciably from Mackay specimens. 
Thynnus Bírói sp. nov. 
cT. Clypeus convex, strongly raised at the base and connected wfith 
the interantennal prominence by a short and very narrow carina, depressed 
towards the apex and very broadly truncated on the apical margin, 
the angles not prominent; finely longitudinally striated, punctured on 
the sides. Head closely and finely punctured ; the antennæ inserted 
much nearer to the eyes than to each other, longer than the thorax 
and of even thickness throughout, the interantennal prominence broadly 
rounded at the apex and divided by a faint, short, longitudinal carina ; 
the ocelli in a broad triangle, the posterior pair nearer to each other 
than to the eyes. Thorax finely and closely punctured; the pronotum 
not quite as broad as the head, the anterior margin raised, with a 
smooth transverse groove behind it; an oblique sulcus on the meso- 
pleuræ behind the middle; the mesonotum with the usual two longi¬ 
tudinal sulci, the space between them more closely and fineli punc¬ 
tured. Scutellum large, broadly truncated at the apex, the median seg¬ 
ment exposed, the dorsal surface more than half as long as the 
scutellum, obliquely truncate posteriorly, with a short, deep, longitudi¬ 
nal sulcus on each side near the apex. Abdomen shining, rather 
sparsely punctured on the dorsal surface, more closely and coarsely 
on the ventral segments ; as long as the head and thorax combined, the 
basal segment rounded at the anterior angles, the sixth ventral segment 
