42 



CC The antennal club segmented; the funicle attached to the end of the 



club. 



D The antennal club loosely segmented, the segments produced on 

 one side, sublamellate (PL 10, figs. 4, 6). 



Phthorophloeus Rey. Page 58 . 



DD The antennal club connate, the segments equal sided. 

 E The antennal funicle 5-segmented. 



F The fore coxse very narrowly separated, practically con- 

 tiguous; the metepimeron visible in part, variably 

 distinct; the epistomal process basal and well-developed; 

 the antennal club flattened, thickened at the base, 

 as wide as or usually wider than long (PL 12, fig. 2); 

 the eyes entire; the pronotum frequently wider than 

 long, punctured; the elytral base not elevated, arcuate 

 and finely crenulate; the scutellum oblique; the fore- 

 tarsal segment 3 wide and deeply bilobed; the 

 ligula in a wide band extending over the distal end of 

 the mentum; the proventriculus with the diagonal lines 

 of teeth very long, the transverse lines on the disc very 

 strongly developed (PL 18, fig. 10). 



Dendroctonus Erich. Page 60. 



FF The forecoxse moderately or narrowly separated; the 

 metepimeron covered by the elytra; the antennal club 

 much longer than wide; the front without a basal 

 epistomal process. 



G The funicle with the outer segments distinctly broader; 

 the club elongate, pubescent, compressed, with three 

 more or less strongly oblique sutures; the eyes deeply 

 emarginate; the forecoxse moderately distant; the 

 prosternum moderately short; the alternate inter- 

 spaces of the declivity usually serrate, more strongly 

 in the male; the metepisternum wide, (PL 10, fig. 7). 

 Phloeosinus Chap. Page 67 . 



GG The funicle with the outer segments hardly widened; 

 the club compressed, obtuse at the tip; the forecoxse 

 narrowly separated; the prosternum very short in 

 front of the coxse; thickly clothed with coarse erect 

 hairs. Cal. Chaetophloeus Lee. 



EE The antennal funicle 7-segmented. 



F Fore coxse rather widely separated; proventriculus with 

 diagonal lines of discal teeth absent or very feebly 

 developed. 



G Antennal club strongly compressed; elytra gradually 

 depressed behind without a steep declivity; venter 

 of abdomen bent upwards behind; clothed above 

 with scales; the disc of the proventriculus not finely 

 granulate, (PL 10, fig. 15). 



Leperisinus Reitter. Page 70 . 



GG Antennal club only moderately or slightly compressed; 

 elytra with declivity distinct and abrupt; clothed 

 chiefly with hairs. 



H Antennal club hardly flattened, subconical, with 

 1st segment almost as long as 2nd and 3rd united; 



