154 SAWFLIES, ICHNEUMON-FLIES, WASPS, ETC. 



off across the line of the advancing army, or beat a 

 line of earth flat with spades, there would be a clear 

 space on which the caterpillars might be seen and 

 crushed (or destroyed in any convenient way) with 

 certainty. 



Attack of Apple Sawfly (figured with its caterpillar, 

 life size and magnified) may be taken as an example 



Fig. 119. — Female Sawfly and caterpillar, magnified, with lines 

 showing nat. size, after Prof. J. 0. Westwood ; caterpillars, nat. size ; 

 and infested Apple. 



of how easy it is, without careful observation, for an 

 infestation, which bears much resemblance to some 

 other kind, to escape requisite notice, /. e., such notice 

 as causes proper measures to be taken, instead of 

 trouble and money being spent to no purpose on 

 applications suited to another attack of which the 

 chrysalis stage is passed in a different locality. 



Apple Sawfly presence has long been known of in 

 this country, but so far as I am aware has been little 

 observed, and it was not until last summer (1891) 

 that I had an opportunity of studying the character- 

 istics. In many respects the attack of these cater- 

 pillars to the Apple fruit much resembles that of the 

 too well-known Codlin Moth caterpillars. It may, 

 however, be certainly distinguished by the Sawlly 



