82 NEW YORK STATE MUSEUM 
g Base of prothorax bordered by a fine, raised line; elytral 
declivity of the two sexes alike...... Pityophthorus Eich. 
gg Base of prothorax without a raised border; teeth of elytral 
declivity much larger in the male than in the female...... 
Pityogenes Bedel 
ce Antennal club not annulated; eyes completely divided; elytral de- 
clivity oblique, not excavated and not toothed [pl. 5, fig. 12, 13] 
Trypodendron Steph. (Xyloterus Erich.) 
bb Antennal club not pubescent on both sides, almost entirely. corneous 
and usually not at all annulated on the imner 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 [pl. 6, fig. 18, ant.; pl. 13, fig. 42] 
d Antennal funicle with 4 segments; elytral aig scalelike.... 
Cryphalus Erich. 
dd Antennai funicle with 5 segments; elytral pubescence not scalelike 
é Blytral dechivaty: excavated and) toothed:. i. 25.5....5--s076eee 
Ips DeG., in part (Tomicus Latr. 1807), 
ee Elytral declivity not excavated, and without prominent teeth 
f 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 
becens: [pls 6; "shies. 14s -aGa fests. a cee gee Dryocoetes Eich. 
# 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’ [pl. 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 
Delain) wj.00 5 ats cye state ye, awl s wishes lope eee eee aval © DENG Eee tte ke 
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 [pl. 6, fig. 16] | 
d Elytral declivity not deeply excavated, at most only slightly con- 
cave; 2d segment of the antennal club surrounding the 1st, which 
is nearly eval [pl) 12; fig. 38])........-.-. «. Bee : : - Xylocleptes Ferr. 
dd Elytral declivity deeply excavated and toothed ; 2d segment of 
antennal club not nearly surrounding the Ist, the ast suture be- 
never SjuRbieinje Ou ehovqoliahe Lol Wy wie, Idle oooenoaqcanuncccoponcces 
Ips DeG., in part (Tomicus Latr. 1807) 
aa Antennal funicle with 6 segments 
b Antennal club distinctly annulated on both sides; elytra aculeate at 
tite SIPs isc oes sac oe Dat wis Gr Eee ee eee eee Micracis Lec. - 
