ACANTHIIDJE. 509 



FAMILY 3. ACANTHIID^E. 



Genus 3. ACANTHIA, Fab. 



Flat, broad, ovate. 



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

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

 projecting between the antennae ; the lobes not denned ; antenni- 

 ferous processes very stout and much deflected : underside with a 

 rostral channel. Antennae ; 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 4th veiy thin, filiform, 

 3rd as long as the 2nd, 4th frds as long as the 3rd. Eyes inserted 

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

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

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

 thinnest ; apex acute. 



Thorax. 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 ; 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. Scutellum broad, short, triangular ; rather convex ; Elytra 

 without clavus, cuneus, or membrane ; Corium 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, trapeziform plate, 

 which hindwardly projects over the metasternum. Legs strong; 

 coxce ; 1st pair close together ; 2nd and 3rd pairs laterally distant ; 

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

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

 2nd together ; claws 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 mesosternurn ; in the ^ a ridge extends 

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



