71 



woodpeckers are undoubtedly of especial service in destrovin"- 

 these feorers, and the tit-mice as they hop over the bark probably 

 destroy their eggs. Another allied species, Saperda lateralis, 

 Fabr., infests the elm, but as it confines its attention to dead trees, 

 it does no harm. 



Another beetle, Neoclytus crythrocephalus, Fabr., reported as 

 boring elms in Michigan. 



A leaf eating beetle which thus far has confined its devastations 

 to the slippery elm is, 



Monocesta coryli\ Sav. 



Figure 54, after Riley, gives a very excellent representation of 

 this insect in its various stages. The beetle is light yellow with 

 " two dark bluish spots on each wing cover." These spots, how- 

 ever, are sometimes entirely lacking. The larvas are of the form 

 shown in figure 54 d., and when fully grown are brown, but when 

 first hatched they are yellow. In August or the last of Julv the 

 larvae go to the ground and tbrm below the surface a cell, in which 

 they pass the winter dormant. The following spring they change to 

 pupse, figure 54 /., and in about a week they become perfect beetles, 

 which appear in June. Spraying infested trees in June, or as soon 

 as the eggs begin to hatch, would be efficient, and Dr. Riley says 

 that as the lar\a5 are very sluggish they may be shaken from small 

 trees. 



There is a large larva which has attacked elms in this neigh- 

 borhood, V)ut I cannot say what it is as I have not been able thus 

 far to capture it. My attention was first called to its ravao-es last 

 fall and one of tlie larvae, the only one apparently in the region, 

 had been taken, Init was destroyed before I returned from out of 

 town. I'he description given by several who saw it would indi- 

 cate the larva of some beetle like Prloniis, and I am incHned to 

 tliink that it was Prioius l>rcvicor/us, Fabr. of a closelv allied 

 species. Its metiiod of attack, however, was difierent from any 

 that I have seen, judging from its results. There were aroinul the 

 tree from w hich the larva that was secured was taken, furrows 

 in the inner bark and outer wood, some of them two or tluee feel 

 long, and callused over by the growth of the bark an inch or even 

 two inches wide.' Of course tlic original furrow was less than 

 this, but the nearly fresh one which I saw was three quarters of 

 an inch wide. Evidently the tree had long been the lionu* of this 

 17 



