MISCELLANEOUS NOTES. 
The Cherry Slug or Pear Slug. (Selcuidrict cerasi, Peck.) 
Order HYMENOPTERA. Family Tenthredinim. 
Fig. 18. 
Fig. 19, 
[A slimy, olive-green worm, half an inch long when full grown, gnawing away the 
substance of \he upper surface of the leaves, in June and July, and again in August and 
September.] 
Although this species was carefully studied and fully described by 
Prof. Peck in 1790, and also discussed at length by Dr. Harris in 
his Insects Injurious to Vegetation in Massachusetts,_ I judge from 
numerous inquiries received this summer, that it is not as well 
known to horticulturists in Illinois as it should be. As it has not 
yet been treated in the reports of the State Entomologists either of 
Illinois or Missouri, a brief account of it and of the methods of meet¬ 
ing its ravages will not be without value. 
This insect was quite abundant and destructive to the cherry 
throughout the northern third of the State during the past summer, 
although I neither saw nor heard of any especial injury to other 
fruit trees. At Elgin, on the 18th of July, several cherry trees were 
seen with their leaves completely denuded; and smaller numbers of 
the larvae were found on the cherry at Rockford, and on the pear 
and cherry at Waukegan. It was also reported destructive to cher¬ 
ries at Montgomery, in Kane county, and was sent me by a corre¬ 
spondent from Aurora, on the 22d of July, where it was said to Rave 
completely defoliated the Richmond cherry, and to have somewhat 
injured sweet cherries, pears and the mountain ash. The effect of 
this destruction of the leaves in midsummer is to compel the tree 
to put forth new foliage, thus taxing its vitality in a way to en¬ 
danger the crop of the following year. As the larvae return again 
for a second attack upon the trees in autumn, the consequences may 
easily become serious. 
