RAPHIGASTRID^. 101 



trion slender, reacliing beyond the 2nd pair of coxae ; sides of the 

 rostral channel slightly produced. 



Thorax. — Pronotiwi hexagonal, hinder angles sometimes much 

 produced. ScuteUum about half the length of the abdomen, trian- 

 gular, the apex produced into a long, narrow, smooth point, which 

 has a slight central channel. Elytra longer than the abdomen ; 

 Memhrane with 5 or more nerves, some of which at the base spring 

 from a cross nerve. Sternum with a deep, thin, central keel ; 

 Prosternum with a slight transverse furrow, bounded anteriorly by a 

 large callosity. Legs slender ; tarsi 2-jointed. 



Abdomen above flattened, with a central keel ; Comiexivum re- 

 curved, moderate, on the 6th segment widened and produced pos- 

 teriorly. Underside convex, with a strong longitudinal keel, termi- 

 nating on the 2nd segment in a strong spine which projects across 

 the sternum, lying on one side of the sternal keel ; the segments, 

 especially in the male, are drawn up in the centre towards the base. 

 Genital segments : in the male the 2ud alone is visible on the upper- 

 side, very narrow, with the sides carried down to a point within the 

 6tli abdominal segment ; in the female the 3rd alone is visible from 

 above as a flat or curved plate, of which the outer margin is more or 

 less rounded, and with a notch in the centre : on the underside in 

 the male two segments are visible, the 1st large, lying in the angle of 

 the 6th abdominal segment, the 2nd very narrow ; in the 9 all three 

 segments are seen, the 1st smaller than in the $ , the 2nd narrow, 

 the 3rd large, as on the upperside. 



Sjjecies 1. — Acanthosoma griseum. 



CiMEX GKisEUS, Lhi. F. S. 926 (1761) ; S. N. i, 721, 43 (1767). 



— iNTEiiSTiNCTus, Lhi. P. S. 927 (1761) ; S. N. i, 721, 44 (1767) ; 



Fab. E. S. iv, 116, 141 (1794) ; S. R. 171, 88 

 (1803). 



— Betuljj, De G. Mem. ill, 261, 8, pi. 14, fig. 9 (1773). 



— AGATHiNUs, Fub. E. S. iv, 114, 133 (1794) ; S. R. 170, 82 (1803); 



Fall. Mou. Cim., 45, 5 (1807); Hem. Suec. 24, 5 

 (1829); Zeti. Faun. Ins. Lap. i, 464, 4 (1832); 

 lus. Lap. 260, 4 (1840). 



— ACHATiNUs, Wol/f, Ic. Cim. 58, t. 6, fig. 55 (ISOl). 

 AcANi'H0S0.\iA AGATUiNUM, U. Scltf. Nom. Ellt. I, 57 (1835). 



