280 THE CANADIAN ENTOMOLOGIST. 



T. pini, Harris. $ with frontal tubercle and elytral armatures more 



prominent. ^ = description. 

 T. caelaius, Eichh. No distinctive external characters observed. 



SCOLYTUS. 



.S. quadrispinosus, Say. $ and $ = descriptions. 



S. muticus, Say. $ = description of $ (?). Head broad and flat in 

 front and thickly fringed with long yellow hairs. Last abdominal 

 segment with two tufts of long hair near the posterior margin. 

 5 new. Head narrow, with impressed longitudinal line in front, 

 and with only a few long hairs. Last abdominal segment without 

 tufts of hairs. 



S. rugulosus, Ratz. $ with head slightly flattened and broader than 

 in $ , the flat surface bearing a few long hairs. $ — Head slightly 

 more convex in front, narrower and .without long hairs (at least in 

 the examples I have examined). 



CHRAMESUS. 



C. icorice, Lee. $ and ? = descriptions. 



POLYGRAPHUS. 



F. rufipe?mis, Kirby. ^ head with one and sometimes two acute 

 tubercles in front. 9 vvithout acute tubercles in front. 



PHLOEOTRIBUS. 



F. frontalis, Oliv. $ and $ = descriptions. 



HYLESINUS. 



If. aculeaius, Say. <^ = description. The narrow, smooth, longitudinal 

 line referred to is present in both sexes. $ : front more convex and 

 less pubescent in front. 



PHLOEOSINUS. 



F. dentatus. Say. ^ Declivity, with rows of rather prominent tubercles. 

 ? Declivity, with rows of granules in place of tubercles. 



DENDROCTONUS. 



D. terebrans, Oliv. ^ with only a few short hairs in front. 5 with 



numerous longer hairs in front. This character is of little value, 

 however, on account of the liability of the hairs to be rubbed off! 

 D. frontalis, Z\vcivci. $ with frontal channel deeper, and the granulate 

 punctures larger than in female. ? Front smoother and more 

 convex. 



HYLURGOPS. 



H. glabratus, Zett. $ with slightly deeper transverse impressions in front, 

 and a longer longitudinal elevated line above base of mandibles. $ 

 with frontal transverse line present, but shorter in some individuals, 

 and obsolete in others. 

 Morgantown, W. Va., August loth, 1894, 



