Ill 



JJ The punctures on the elytral interspaces 

 uniseriate, at most only very little confused 

 behind; the first two interspaces usually 

 rather strongly granulate throughout. 



K The front of the head densely, finely 

 granulate, the strial punctures usually 

 close and of medium size. 



interruptus Eichh. Page 118. 



KK The front of the head very coarsely granu- 

 late, with abundant long hairs. 

 L The punctures of the elytral striae of 

 medium size and usually rather 

 widely separated. 



dubius, n. sp. Page 119. 



LL The punctures of the elytral striae very 



coarse, quadrate, and very closely 



placed; very coarsely sculptured, 



pilifrons Sw. <?. Page 119. 



II The front of the head at least distinctly elevated 



on the epistomal region. 



J The front with a very strongly elevated, nearly 

 naked geminate prominence on the episto- 

 mal region (PI. 17, fig. 1). 



tridens Mann. Page 119. 



JJ The front of the head moderately but dis- 

 tinctly elevated on the epistomal region. 

 K The epistomal elevation stronger and 

 clothed on the oblique cephalic face 

 with a dense brush of hairs. 

 L The brush of hairs on the rather small 

 cephalic face of the frontal elevation 

 long and incurved; the punctures of 

 the elytral striae moderate in size; 

 the length usually less than 4 5 mm. 

 (PL 17, fig. 3). 



engelmanni Sw. 9 . Page 120. 



LL The brush of hairs on the rather large 

 cephalic face of the frontal elevation 

 short and extremely dense, re^m- 

 bling the pile on velvet; the al 

 punctures very large and deep, the 

 length usually more than 4-5 mm. 

 (PI. 17, fig. 4). 



pilifrons Sw. 9. Page 119. 



KK The epistomal elevation very moderately 

 developed, only moderately normally 

 pubescent, finely granulate. 



yohoensis Sw. Page 120. 



Ips concinnus Mannh.; Bull. Mosc., 2: 357, 1852 (Bostrichus) ; hirsutus Eichh., 

 Berl. Ent. Zeit., 402, 1867 (Tomicus). 



Length, 4-5 mm. to 5 mm.; rather elongate, with parallel 

 sutures of the antennal club very strongly elongate-arcuate, strongly but 



