320 Mr. G. R. Waterhouse on some new genera and 
strongly emarginated in front, much broader than long, and but 
little narrower than the elytra; it is contracted in front and be- 
hind, and broadest rather behind the middle ; the lateral margins 
are greatly produced and distinctly curved upwards ; the dorsal 
surface is slightly convex and thickly but finely punctured. The 
elytra are but slightly convex above, have a distinct lateral keel, 
which is slightly reflected, and towards the apex of the elytra this 
keel is indistinctly broken up into some small tubercles; the 
whole surface is finely punctured, and there are some extremely 
faint traces of striz ; the apex of the elytra is slightly produced. 
It is the distinct lateral keels to the thorax and elytra which 
gives the flatness to the back of this insect, and imparts to it the 
aspect of an Akis. 
Family TENTYRIIDA. 
Genus Turtnoxpatis, Eschscholtz. 
Thinobatis rotundicollis. Thin. piceo-rufa, pilis minutissimis ad- 
spersis ; thorace transverso subrotundato, supra convexo ; elytris 
breviter ovatis, postice subacutis, indistincte striatis, interstitiis 
paulo convexis; antennis pedibusque ferrugineis.— Long. corp. 
12 lin. 
This species, as it would appear (judging partly from Esch- 
scholtz’s description and partly from his figure*), is of smaller 
size than the Th. ferruginea, the thorax more transverse, and 
more boldly rounded at the sides, and the posterior angles must 
be more obtuse; indeed the hmder margin is almost evenly 
rounded, the angles bemg scarcely perceptible. 
The characters of the genus Tinobatis, as drawn up by M. So- 
lier}, are taken from an insect which evidently differs in several 
respects from the type of the genus (Thinobatis ferruginea), and 
more especially in having distinct posterior angles to the thorax, 
the humeral angles of the elytra prominent, and, I strongly sus- 
pect, in the form of the mentum. Unfortunately Eschscholtz is 
silent on this last point ; but m the sect above described, which 
approaches most nearly to the Th. ferruginea, the mentum is either 
truncated in front or most indistinctly emarginated, and not deeply 
emarginated as in the figure and description of M. Soher. Again, 
the elytra are of an ovate form in the two species of Thinobatis 
with which I am acquainted, and not subparallel. The terms 
“ corps filiforme, déprimé,”’ used by the Comte de Castelnau { in 
his definition of Thinobatis, will by no means apply to the type 
of the genus. 
* See Eschscholtz’s Zoologischer Atlas, part 4. pl. 18. fig. 3. p. 8. 
+ Annales de la Société Entomologique de France, tom. iv. p. 406. 
t Cours complet d’ Histoire Naturelle, Insectes, tom, ii. 
