12 



ENTOMOLOGICAL NEWS. 



[January, 



will confine myself to Scolytus, two species of which were reared from 

 this tree, principally from the trunk. They were 6". 4-spinosus and S. ru- 

 gulosus, there being but a few of the latter. As to the former species, a 

 detailed account is appended showing when and how many emerged. 



My own observations go to show that trees in full health and vigor are 

 not so liable to be attacked by Scolyttis. I do not mean to imply that it 

 is always necessary for some other insect to start the work of destruction, 

 but on the contrary the effects of a severe drought is sufficient excuse for 

 these beetles to start their work on any trees that may have suffered from 

 the lack of water. 



The Summer of 1894 witnessed a severe drought in this locality; a few 

 of our trees began to wither, and three of these were then attacked by 

 Scolytus, who hastily completed the deadly work by eating holes in the 

 bark, apparently for no other purpose but food. One of these trees was 

 wild cherry, it being killed by .S". rugulosus; the other two were ' ' Black 

 Tartarian" cherries, and were killed by .S". 4-spinosus. 



Scolytus muticus does not seem to be a pest here; I have found it very 

 rare, save on the occasion of which I shall now speak. On the fifth of 

 August, 1895, I ran across a tree which had been burned in the early part 

 of the previous year. The fire had charred it to a considerable height, 

 and upon examination I found that it contained a number of living in- 

 habitants, among them being the larvae and imago of S. muticus. Being 

 in need of the latter I sawed off one of the main lower branches and 

 barreled it. The following list gives the dates of the emergence of the 

 specimens: 



