NEW SPECIES OF THYNNIDÆ. 
121 
specimen. The male is nearly allied to T. olivaceus Turn, but in that 
species the thorax is opaque and much more closely punctured, the 
hypopygium longer and narrower, and the postscutellum does not pro¬ 
ject beyond the median segment. The fifth ventral segment of the female 
serriger is closely longitudinally striated. 
* 
Thynnus calvus sp. nov. 
£. Clypeus short and transverse, with large punctures, the apical 
margin narrowly smooth, without a carina. Head half as broad again 
as long, rounded at the posterior angles ; the vertex shining, with a 
few fine scattered punctures, the front deeply excavated on each side, 
the concave area smooth and shining rounded at the base and not 
quite touching the eyes, the ridge between the excavations punctured 
and with a median carina, the sides raised and forming lateral carinæ, 
the whole nearly as broad as one of the excavations, wTiich are sepa¬ 
rated from the vertex by a rather broad coarsely punctured area thinly 
clothed with long fulvous hairs. Scape about half as long as the flagel¬ 
lum, elbowed in the middle and strongly broadered to the apex. Prono- 
tum straight on the anterior margin, where it is nearly as broad as 
the head and nearly half as broad again as long, narrowed posteriorly 
and only a little broader on the posterior margin than long; coarsely 
punctured, the punctures confluent, with an obscure median longitudi¬ 
nal carina, and a small concave space on each side touching the an¬ 
terior margin. Pleuræ smooth, scutellum and median segment finely 
and sparsely punctured, the median segment nearly as long as the 
scutellum and very sharply sloped posteriorly. Abdomen much broader 
than the thorax ; the first segment vertically truncate anteriorly, without 
hairs, smooth at the base, with four or five transverse carinæ at the 
apex ; second segment with about nine transverse carinæ ; segments 
3—5 shining, with a few scattered punctures. Pygidium vertically trun¬ 
cate posteriorly, strongly narrowed and transversely striated before the 
base of the truncation, the surface of the truncation oval and smooth ; 
the epipygium only reaching the middle of the truncation, trilobed at 
the apex, the middle lobe the longest and rounded at the apex, the 
lateral lobes produced into short spines ; the hypopygium with an emar- 
gination at the apex, the lateral edges finely serrated. Fifth ventral 
segment closely longitudinally striated, the first segment longitudinally 
carinated from the base, with an oblique, almost smooth, triangular 
truncation at the apex, the remaining ventral segments rather coarsely 
punctured. 
