CS2 NEW YORK STATE MUSEUM 



a Base of prothorax bordered by a fine, raised line; elytral 



declivity of the two sexes alike Pityoplithorus Eich, 



gg Base of prothorax without a raised border; teeth of elytral 



declivity much larger in the male than in the female 



Pityogenes Bedel 

 cc Antennal club not annulated ; eyes completely divided ; elytral de- 

 clivity oblique, not excavated and not toothed [pi. 5, fig. 12, 13I 



Trypodendron Steph. (Xyloterus Erich.) 

 bb Antcimal club not pubescent on both sides, almost entirely corneous 

 and usually not at all annulated on the inner face; at most, the 

 outer segments of the club show from the inner side but slightly at 

 the distal extremity 

 c Antennal club obliquely truncate at the distal end of the outer sur- 

 face, with the distal segments of the club confined to the truncate 

 surface and telescoped so that the flat, pubescent, truncate surface 

 appears concentrically annulated [pi. 6, fig. 18, ant; pi. 13, fig. 42I 

 d Antennal funicle with 4 segments; elytral pubescence scalelike.... 



Cryphalus Erich. 

 dd Antennal funicle with 5 segments ; elytral pubescence not scalelike 



e Elytral declivity excavated and toothed 



Ips DeG., in part (Tomicus Latr. 1807) 

 ee Elytral declivity not excavated, and without prominent teeth 

 / Caudal margin of prosternum extending into a long spinelike 

 process which projects caudad between the forecoxae. Max- 

 illary lobe with radiating spines on the outer edge, bark 



borers [pi. 6, fig. 14, 18] Dryocoetes Eich. 



if Caudal margin of the extremely short prosternum at most but 

 slightly produced on the median line ; maxillary lobe pilose, 

 without radiating spines on the outer edge, borers in wood 

 and nuts [pi. 6, fig. 15, 17] 

 g Tibiae with the outer edge straight, spinose; dorsum of pro- 

 thorax not more strongly roughened in front than behind.. 



Coccotrypes Eich. 



gg Tibiae with the outer edge curved, finely serrate ; dorsum 



of prothorax much more strongly roughened in front than 



behind Xyleborus Eich. 



cc Antennal club with the distal segments not telescoped to form a flat,, 

 truncate surface, distinct, and not confined to the distal extremity 

 of the outer surface [pi. 6, fig. 16] 

 d Elytral declivity not deeply excavated, at most only slightly con- 

 cave; 2d segment of the antennal club surrounding the ist, which 



is nearly oval [pi. 12, fig. 38] Xylocleptes Ferr. 



dd Elytral declivity deeply excavated and toothed ; 2d segment of 

 antennal club not nearly surrounding the ist, the ist suture be- 

 ing straight or angular [pi. 6, fig. 16] 



Ips DeG., in part (Tomicus Latr. 1807) 

 aa Antennal funicle with 6 segments 



b Antennal club distinctly annulated on both sides ; elytra aculeate at 

 the tip Micracis Lee. 



