45 



B The antennal funicle with not more than three segments; the metepis- 

 ternum covered on the posterior half, the fore tibiae but little widened 

 distally (PI. 9, fig. 15). 



C The funicle of only one segment; the fore tibiae without transverse 

 ridges or asperities on the outer face, strongly serrate distally on 

 the outer margin; stout species; Eastern States. Corthylus Er. 



CC The funicle of two segments, the second smaller and closely attached 

 to the club (PI. 10, fig. 38); the fore tibiae with transverse ridges 

 or asperities on the outer face, serrate on the entire outer margin; 

 elongate species (PI. 9, fig. 15). Pterocyclon Eichh. Page 86. 



BB The antennal funicle with more than three segments; the fore tibiae 

 more or less strongly widened distally (PI. 9, fig. 24). 



C The body clothed with scales or short scale-like hairs; the pronotum 

 armed with comparatively few, large, isolated, spine-like or tuber- 

 culate asperities; small species. 



D The pronotum acutely margined on the sides; stout species with 

 the antennal club but little longer than wide. 



E The elytra deeply striate. 



F The antennal funicle 4-segmented, the fourth segment 

 narrow. Eastern United States, etc. 



Hypothenemus West. 



FF The antennal funicle 5-segmented, the fifth segment wide. 



Eastern United States, etc. Stephanoderes Eichh. 



EE The elytra feebly striate; the funicle 4-segmented. 



Cryphalus Er. Page 87 . 



DD The pronotum without an acute side margin. 



E The antennal funicle 4-segmented; the eyes simple. 



F The anterior margin of the pronotum rounded. 



Letznerella Reitter. Page 90. 



FF The anterior margin of the pronotum produced. 



Procryphalus Hopk. Page 90 . 



EE The antennal funicle 5-segmented, the club much longer than 

 wide; the elytra elongate; the pronotum with rather 

 numerous isolated asperities, rather smaller than usual, 

 (PI. 10, fig. 26). Trypophloeus Fairm. Page 90. 



CC Body clothed with hairs, often nearly glabrous; pronotum with 

 numerous small asperities or more or less distinct granules in 

 front (PI. 18, fig. 17). 



D The pronotum finely margined with a transverse raised line near 

 the caudal border; the metepisternum largely covered by the 

 elytra, visible only in front (while the elytra are in the normal 

 tightly closed position) (PI. 9, fig. 20). 



E The mouthparts, as seen from below, rather sparsely clothed 

 with slender hairs, the maxillary lobe pilose (PI. 9, fig. 11); 

 the body slender, very smooth, punctures and pubescence 

 nearly obsolete except on the declivity; the pronotum 

 closely but feebly asperate in front, with an acute, arcuate, 

 transverse, short carina at the summit, which is before the 

 middle (PI. 18, fig. 17). Gnathotrichus Eichh. Page 90. 



