HYLESINUS CRENATUS. 275 



attacked, the more do galleries which are normally horizontal 

 tend to become vertical. 



In the ecclesiastical forests of Temeser Banat, in Hungary, 

 the ash woods have since 1888 been seriously attacked by 

 this beetle. By the summer of 1890, 17 per cent, of the trees 

 of a total standing crop of 2,570,000 cubic feet were killed. 



d. Economic Rules. 



i. Selection of suitable localities for planting ash-trees, and 

 attention to such rules of management as will keep the trees 

 healthy. 



ii. All infested trees should be barked in June and July, and 

 their bark and branches burned. 



iii. Trees attacked may be tarred. 



6. Hylesinus vittatus, Fabr. 



Beetle similar to H. fraxini, Fabr., but only 1J to 2 mm. 

 long ; with a white stripe on each elytron extending from the 

 shoulder to the middle of the suture and enclosing a common 

 oval dark patch ; it makes double-armed horizontal galleries 

 in the elm. 



7. Hylesinus crenatus, Fabr. 



a. Description. 



Beetle 5 to 6 mm. long; ovate, 

 blackish - brown or black, its under 

 surface hairy. 



Thorax tapering in front, distinctly 

 broader than long, thickly and coarsely 

 punctured ; elytra broadest at the 

 middle, obliquely and not strongly 

 declivous behind, with coarse punc- 

 tured striae, the interstices granulate 

 and furnished with short black hairs ; 

 abdomen curved upwards towards the 



apex. Fig. 134. Hylesinus 



I. Life-history. crenatus, Fabr. 



Similar to that of H. fraxini ; but 

 the generation is said to be double. The flight-period is at 



T2 



