546 CLASS INSECTA. 



the abdomen, sometimes of its breadth, but rounded at the 

 posterior angles, and leaving a void between them and the 

 base of the elytra. The last articulation of the antennas is at 

 least as large as the preceding.* 



Other pimeliae differ from the foregoing in the form of the 

 head and corslet. This former part is as if squared and 

 more or less narrowed behind ; the middle of its anterior 

 edge has an emargination receiving the labrum. The dila- 

 tation of the lateral edo-es covering; the base of the antennae 

 is larger and elongated to the anterior edge. These organs 

 are always composed of eleven articulations very distinct, 

 sub-cylindrical, except the last, with the third very long. 

 The outside of the mandibles is strongly excavated in the 

 middle, and the lower sides of the head, forming the lateral 

 encasing of the jaws and chin, terminates in a point, or tooth- 

 like. The corslet is in the form of a truncated heart, and 

 much emarginated in front in most. These pimeliae include 

 a great part of the genus. 



Akis, Fab. 



These are now restrained to the species whose corslet is 

 broader than the head, decidedly emarginated in front, short, 

 widely truncated on the hind edge, with the lateral edges 

 elevated. The first division of Akis of Fab. Fischer. En- 

 tom. de la Rus. I. xv. 7> 8? 9. 



Another species, A. collaris, has the head measuring a 

 little wider than the corslet, more elongated behind, and a 

 little narrowed at the base in the manner of a neck ; the cors- 

 let is much more narrow all its length than the abdomen, 



* Lat. ibid. II, 154, Akis glabra, punctata, cAbreviata, angustata, orbi- 

 ciilata, of Fab. I think that Tagona, of Fis. is also referable to this 

 sub-genus. 



