92 TRANSACTIONS OF THE ILLINOIS 



Of the two species injurious to the pkim, one is of the first class — the 

 plum curculio, just mentioned ; and the other of the second class — the 

 plum-gouger, {Anthonomus Pritncida.) 



The species injurious to the quince is the quince curculio, ( Constrache- 

 lus cratcegi). This does not probably rank above the third class. Besides 

 this the foliage of the quince is sometimes damaged by several kinds of 

 caterpillars, which must be placed in the fourth class. 



Of the seventeen species injurious to the grape, none can be called 

 first class in this country. That is to say, there is no species of insect in 

 this country which generally and extensively interferes with the raising 

 of this fruit. But in Europe, the grape-louse {Phylloxera vastatrix) 

 would undoubtedly take the rank. Of the seventeen species referred to, 

 scarcely more than three can rank as high as the second class. These are 

 the steel-blue beetle, {Haltica chalybea,) the grape leaf-hopper, {Tetti- 

 gonia vitis), and the grape root-louse, (^Phylloxera vitifolia.) The other 

 fourteen, including the large Sphinx caterpillars, the blue caterpillars of 

 the vine, the grape codling, and others, could hardly rank above the 

 third class, though with respect to some of them there would probably be 

 a difference of opinion even amongst competent judges. 



Of the four species injurious to the currant, none are of the first 

 class, one of the second class, namely, the imported currant saw-fly, 

 {Nematus trimaculatus,) and three of the third class. In particular 

 localities the imported saw-fly has rendered the raising of currants an 

 impossibility, and its damages have therefore attained first-class propor- 

 tions, but the species has not become sufficiently diffused to raise it to a 

 primary rank in a general enumeration of injurious insects. 



Of the three species injurious to the strawberry, two may be admitted 

 to the second class — the strawberry crown-borer, {Analcis /agaric?,) 

 and the strawberry leaf-roller, {Anchylopera fragarice,) the other species, 

 the strawberry black-bug (Coreomelas pulicaria) would fall into the third, 

 or even fourth class. 



Of the insects injurious to the blackberry and the raspberry, I have 

 placed but one species as high as the second class in point of injurious 

 qualities, and this is the raspberry borer, (Saperda ( Oberea') tripunctata. ) 



We have not time to specify the twenty-six species referred to as 

 being injurious to vegetables. We can only say, in passing, that there is 

 no cultivated vegetable, with the exception, perhaps, of the rhubarb, or 

 pie-plant, which has not its one at least, and usually its two or three 

 seriously injurious insect depredators. 



In the selection of one hundred species of insects most detrimental 

 to human interests, we have included fourteen as being injurious to grain. 

 These are, of course, the most important of all, for the obvious reason 

 that we are dependent upon the production of the several kinds of grain 

 not only for our bread, but also, in a great measure, for our meat. It is 

 a remarkable fact that though many kinds of insects are more or less 

 injurious to grain, probably nine-tenths of all the damage done, is effected 

 by three species, which therefore take the first rank in the list of in- 

 jurious insects. These are the chinch-bug, i Micropus leucopferus,) the 



