266 THE GENERA AND SPECIES OF A]^IYCTERID^, 



This genus wliich was used by Schonherr for the ^Yhole sub- 

 family of Amyderidce, has been limited by Lacordaire to those 

 insects of which Am. Sclionherri may be regarded as the type, a 

 group which, though small in number, seems to comprise the 

 giants of the sub-famil}''. 



All those I know, with the exception of A. Boisduvalii, have 

 the thorax armed with large tubercles somewhat in the manner 

 of some species of the genus AcanihoIoj,)]ms. The concave sub- 

 carinated head, with the convex outline of the rostrum, seems to 

 be the most distinctive feature of the genus. 



1. — Amtcterus Boisduvalii. Dup. 

 Boisd., Voy. de I'Astrol, II., p. 393. 



" Ater oblongus postice sublatior squamulis minutis albis 

 adspersis presertim lateraliter, rostro latissimo canaliculato 

 intus bisulcato, thorace rugoso, elytris rugulosis spiuis 

 conicis postice inclinatis gradatim crassioribus instructis." 

 Boisd. 



Long. 12 lin., lat. 4 lin. 



Hab. King George's Sound. 



This insect is very different in many respects from the other 

 and more typical species of the genus, but it has also much in 

 common with them, and is clearly the point of connexion with 

 the preceding genera. 



The female differs greatly from the male, it is much larger 

 and broader, and has the elytra more convex and ampliated, 

 while the tubercles are smaller and not conical. The apex of the 

 elytra, also, in the female, is sharply and somewhat remotely 

 m.ucronate. 



2. — Amtcteeus Deaco. MacLeay. 

 Psalidura Draco, MacLeay, App. to King's Voy., vol. II., p, 444. 



" Atro-fuscus vertice concavo cruce impresso clypeo emarginato, 

 thorace depresso utrinque dilatato dentato margine antice 

 tuberculato tuberculorumque lineis quatuor duabus raediis 

 lougitudinalibus, elytris punctis elevatis scabrosis utrinque 



