ORDER COLEOPTERA. 549 



is elongated behind and carried on a sort of neck. The cors- 

 let is in the form of an elongated heart, truncated at both 

 ends. The abdomen is ovaliform. (Lat. Gener. Crust. II. 

 Herbst. Col. VIII.) 



PSAMMETICHUS, Lat., 



With the antennas composed of articulations top-shaped, 

 the third of which is much longer than the following, and 

 the eleventh or last as large as its preceding, and very dis- 

 tinct. The head and corslet are formed like a long square, of 

 the same breadth throughout. The abdomen is nearly ovali- 

 form and truncated at the base. This sub-genus is esta- 

 blished on inedited species from Chili. 



In these the corslet is at least as broad as the abdomen, 

 and almost orbicular in form, or square, rounded laterally, 

 and either isometrical or broader than it is long. 



ScAuiius, Fab. 



In these the last articulation of the antennae is ovoidoconi- 

 cal and elongated ; the corslet is almost isometrical, and the 

 anterior thighs are swollen and often indented in the 

 males. The legs are long and narrow. These insects belong 

 to the hot western countries of the Old World. 



ScoTOBius, Germ. 



In these the last articulation of the antennae is scarcely 

 larger than the preceding, and in form of a reversed top ; 

 the corslet is obviously wider than it is long, much arched 

 on the lateral edges ; the thighs differ but little in thickness, 

 and the fore-legs form an elongated triangle, and angular. 

 These heteromera belong to South America. 



Other pimeliae, with the antennae chaplet-formed, and the 

 mentum entire, are remarkable for the lateral dilatations, an- 

 gular or tooth-formed, of their corslet. The middle of the 



