320 Mr. G. R. Waterliouse on some new genera and 



strongly emarginated in front, mucli 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 striae ; 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 TENTYRIID^. 



Genus Thinobatis, Eschscholtz. 



Thinobatis rotundicollis. Thin, piceo-rufa, pilis minutissimis ad- 

 spersis ; thorace transverse subrotundato, supra convexo ; elytris 

 breviter ovatis, postice subacutis, indistincte striatis, interstitiis 

 paulo convexis; antennis pedibusque ferrugineis. — Long. corp. 

 If 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 hinder margin is almost evenly 

 rounded, the angles being scarcely perceptible. 



The characters of the genus Thinobatis, as drawn up by M. So- 

 lierf, are taken from an insect which evidently difi'ers 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 in the insect 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. Solier. Again, 

 the elytra are of an ovate form in the two species of Thinobatis 

 with which I am acquainted, and not subparallcl. The terms 

 " corps filiforme, deprime," used by the Comte de Castelnau J in 

 his definition of Thinobatis, will by no means apply to the type 

 of the genus. 



♦ See Eschscholtz's Zoologischer Atlas, part 4. pi. 18. fig. 3. p. 8. 

 -f* Annales de la Soci^te Entomologique de France, torn, iv, p. 406. 

 X Cours complet d'Histoire Naturelle, Insectes, torn, ii. 



