acanthiidj?;. 509 



Family 3.— ACANTHIID^. 



Genus 3. — Acanthia, Fab. 



Flat, broad, ovate. 



Sead broad, convex, sides behind the eyes straight ; Face long, 

 broad, convex, triangidar ; the base of the triangle being in front, 

 projecting between the antenna ; the lobes not defined ; antenni- 

 ferous processes very stout and mucb deflected : underside with a 

 rostral channel. AntenncB ; 1st joint not reaching to the end of the 

 face, stout; 2nd stout, 4 times as long, but not so thick as the 1st, 

 very slightly thickened to the apex ; 3rd and 4tb very thin, filiform, 

 3rd as long as the 2nd, 4th f rds as long as the 3rd. Fi/es inserted 

 at the front of the sides of the head, large, somewhat flattened, 

 prominent. Sostruvi ; the joints in length subequal ; 1st at the 

 base enclosed by the lahium and cheek-plates ; 2nd broadest ; 3rd 

 thinnest ; apex acute. 



Tliorax. — Pronotum sub-reniform, much wider than long ; anterior 

 margin very concave, not raised into an annulus ; side margins folia- 

 ceous, more or less reflexed, rounded, in front projecting j exterior 

 angles rounded ; sides gradually narrower to the hinder angles, which 

 are obtuse, almost right angled ; posterior margin straight ; disk 

 concave, posteriorly depressed, with a strong ridge within the hinder 

 angles. Scutellimi broad, short, triangular ; rather convex ; Elytra 

 without clavus, cuneus, or membrane ; Corkmi as wide, but scarcely 

 so long as, the 1st segment of the abdomen ; posterior margin slightly 

 rounded. Wings wanting, or rudimentary. Sternum ; Mesosternum 

 in the centre, between the coxae, with a long, flat, ti'apeziform plate, 

 w^iich hindwardly projects over the metasternum. Legs strong; 

 cox(B ; 1st pair close together ; 2nd and 3rd pairs laterally distant ; 

 thighs all subclavate, thickest at the base ; tihice of equal size 

 throughout; tarsi; 1st joint short; 3rd longer than the 1st and 

 2nd together ; claios long. 



Abdomen oval, flat, base much wider than the pronotum ; con- 

 nexivum very narrow. Underside, on the 2nd segment, in the 

 middle, a long, thick, trapeziform, flat plate, directed forwards and 

 joined to the plate of the mesosternum ; in the ^J a ridge extends 

 from each side of the plate as far as the 4th segment. 



