448 



WEST VIRGINIA EXPERIMENT STATION 



spruce log, Cranesville, May 9, '97. Abundant in bark of larch 

 stumps and dead trees; same locality and date. 



Fig. XCIV Galleries of Pityogenes plagiatus in bark of scrub pine. 



177. Dendroctonus frontalis Zimm. Exceedingly abundant 

 in 1891 to winter of '92 and '93; apparently extinct in this State 

 since the spring of 1893. Infested living and partly dead bark 

 of living trees. Destructive to all of the pines and the native 

 and cultivated spruces attacked by it. Most destructive bark 

 beetle of which we have any record. 



Fig. XCV Galleries of Pityogenes plagiatus in outer 

 surface of wood of seasoned scrub pine twig. 



178. Crypturgus pusillus Gyll. Very common in dead bark 

 of pitch, scrub, yellow table mountain pine, occupying; galler- 

 ies of other bark beetles, see Fig. XCVI. 



179. Crypturgus alutaceus Sz. Common in dead bark of black 

 and Norway spruce. 



180. Hylastes porculus Er.(=Hylastes sp. Bull. 31. W. Va, 

 Agr. Exp. Sta.) Rare. In bark at base of dying tree; taken in 

 scrub, yellow and white pine, and occurring in swarm of Scoly* 

 tids, 3 May 4, '93. 



