46 



EE The mouth parts, as seen from below, densely clothed with 

 stiff hairs, the maxillary lobe spinose; the body slender or 

 stout, usually rather strongly punctured and pubescent; 

 the pronotum strongly asperate in front without a trans- 

 verse carina at the summit, which is usually median in 

 position. 



F Body very stout; the pronotum with the marginal granules 

 almost obsolete; the discal asperities extending over 

 more than the cephalic half of the sides, and the disc 

 evenly convex, without a transverse impression behind 

 the summit; the antennal club not septate (PL 10, 

 fig. 17). Conophthorus Hopk. Page 92. 



FF Body slender to moderately stout, the pronotum with the 

 front margin usually distinctly asperate, the sides punc- 

 tured and without granules on the caudal half, the disc 

 transversely, broadly impressed behind the summit; the 

 antennal club usually septate (except ramiperda). 



G Elytra and pronotum minutely and densely punctulate 

 and densely clothed with very fine short pubescence; 

 the club with the first segment narrower than the 

 others; the prosternal process elongate-acute, the 

 male with long hairs on the front, (PL 10, fig. 24). 

 Pseudopityophthorus, new genus. Page 93. 



GG Elytra and pronotum coarsely or finely and rather 

 sparsely punctured and pubescent; the club with the 

 1st segment usually subequal in width to the others; 

 the prosternal process short and wide; the special 

 development of hairs on the front a female character. 

 Pityophthorus Eichh. Page 94. 



DD The pronotum not margined behind; the metepisterna distinct 



for the entire length. 

 E The antennal funicle 5-segmented. 



F The 'pronotum precipitous or oblique in front, asperate 

 before the summit; usually punctured behind (except 

 Ambrosiodmus and Xylocleptes). 



G The pronotum strongly declivitous and strongly asper- 

 ate in front, not granulate behind (except in Ambro- 

 siodmus) . 



H The fore tarsi only moderately widened distally; 

 the mouthparts as seen from below clothed with 

 many stiff hairs, the maxillary lobe spinose 

 (PL 9, fig. 12); the elytral declivity usually 

 toothed or excavated or both (PL 13, fig. 5). 

 True Bark-beetles. 



I The posternum very short and oblique in front 

 of the coxae, with the intercoxal process short, 

 wide, not extending far between the coxae (PL 9, 

 fig. 40) ; the front of the female usually deeply 

 excavated (PL 15, figs. 1, 2); the antennal 

 club flat, compressed, sutured on both sides, 

 the first segment subcircular, occupying the 

 basal two-thirds on inner side (PL 10, fig. 25) ; 

 [proventriculus with "closing teeth" longer than 

 masticatory plate; the male genitalia with the 



