448 INSECTA. 



angles, and leaving an hiatus between them and the base of the elytra. 

 The last joint of the antennae is at least as large as the preceding 

 one(l). 



Other Pimeliariae are removed from the preceding ones by the 

 form of their head and thorax. The first is a kind of square, more 

 or less narrowed behind, and the middle of its anterior edge pre- 

 sents an emargination which receives the labrum. The dilatation 

 of the lateral margin covering the base of the antennae is greater, 

 and prolonged to the anterior edge. The latter organs are always 

 composed of eleven very distinct joints, almost cylindrical, the last 

 few excepted, with the third very long. The middle of the outer 

 side of the mandibles is deeply excavated, and the inferior sides of 

 the head, forming the lateral casing or frame of the maxillae and 

 menturn, terminate in a point, or in the manner of a tooth. The 

 thorax is in the form of a truncated heart, and well emarginated 

 before in most of them. These Pimeliariae comprise a great portion 

 of the genus 



Akis, Fab., 



Now restricted to those species in which the thorax is wider than 

 the head, strongly emarginated before, short, its posterior margin 

 widely truncated, and the lateral edges turned up(2). 



Another species A. collaris. Fab. in which the head mea- 

 sured anteriorly is rather wider than the thorax, more prolong- 

 ed posteriorly, and slightly strangulated at base in the manner 

 of a neck, and where the thorax is much narrower throughout 

 than the abdomen, small, convex, inclined and not turned up 

 on the sides, forms the genus 



Elenophorus, Meger. Dej., 



Where the antennae are also somewhat longer than in Akis, and 

 the eyes are narrower and emarginated. 



The last Pimeliariae of that division, in which the mentum is emar- 

 ginated, are distinguished from the preceding ones by the manner 

 in which it terminates: instead of being rounded and divided into 

 two festoons, it is slightly emarginate or concave, with the lateral 

 angles acute, and proportionally shorter and narrower at its base or 

 more cordiform; it covers the maxillae. The eleventh joint of the 



i 



(1) Lat-, Gener. Crust, et Insect., II, 154; the Akis glabra, punctata, abbreviata, 

 angustata, orbiculata, of Fabricius. I also think we should refer the Tagona 

 Tagona, Fischer, Entom. Russ., I, xvi, 8, 9 to this subgenus. 



(2) The first division of the Akis, Fab. See also Fischer, Entom. Russ., I, xv, 

 7, 8, 9. 





