Insects Injurious to the Raspbei'ry. 435 



appear in summer, when attack on the foliage would not matter so 

 much, unless very serious. 



It would be well, uevertheliiss, to take steps to destroy them, even 

 if present in only small numljers, as those tliat may appear earlier 

 would cause no slight loss. 



DKsriaPTroN of the Adult. 

 In length the male and female are mucli the same, 12 to 14 mm. 

 Cameron (3) gives 4 to 4^ lines (a line is equal to J^ incli). 



FIG. 2S4.— THE RASPBERRY SAWFLY (Emphytus ductus). 

 1, sawflies ; 2, ichiieuiiion parasites; 3, cocoon of lurvn 



General colour shiny black ; head lilack, with fuscous grey down ; 

 palpi and labrum black, but the latter may be pale grey, and also 

 the apex of the former ; the nine-jointed antenna? are deep black. 

 Thorax black, with two round yellow to white spots, placed 

 posteriorly. 



Abdomen shiny black, a small but distinct pale blotch on the 

 middle of the posterior of the first segment, tlie fifth segment has a 

 dull white to bright white basal band spreading out at the sides and 



2 F 2 



