The Canadian Horticulturist. 



299 



Fig. 71. 

 Raspberry Gall. 



Fig. 72.— The Gall Producer 

 (Diastrophus Turgidus). 



Although the galls are full-grown towards the end of 

 [une, they should not be gathered until the following 

 spring. When collected, the galls should be placed in a 

 glass jar — a candy jar having a mouth about i }4 inches 

 wide will do very well — -and the mouth should be loosely 

 stopped with a plug of cotton batting. The producers 

 begin to come out about the middle of May, and may be 

 seen walking on the side of the jar next the light. They 

 are " short and chunky." The head and thorax are 

 black and the abdomen is 

 reddish-brown, flattened lat- 

 erally and rounded. They 

 may be readily recognized 

 from Fig. 72. 



They are easily transferred 

 from the large jar to a small 

 bottle, say, a 4 or 6 oz., 

 wide mouth, by placing the 

 mouths together and laying them horizontally, with 

 the small bottle towards the light, and, as insects 

 always move towards light, they will soon pass from 

 the large jar to the small bottle, when, if they be all 

 producers, a few drops of chloroform will soon finish them ; but, if there be any 

 parasites among them, they should not be chloroformed, but all allowed to 

 escape on a window which is open above, when the producers can be killed as 



they crawl over the glass, and the parasites will 

 escape at the open space above. 



Usually the most numerous parasite is a To/y- 

 mus, of a coppery, brown-greenish color, with a 

 long ovipositor — "a tail" — which is slightly turned 

 upwards, and they walk about with a staid and 

 majestic step. Fig. 73 is a very good outline. Of 

 course, none of these should be killed. 



The next most numerous parasite is an Ichneu- 

 7non. The head and thorax are black, the abdo- 

 men reddish-blackish towards the end. They run 

 about with a quick, nervous, weasel-like gait. 

 They may be readily recognized from Fig. 74. 

 None of these should be killed. 



The next in order is an Ormyrus ; of a uniform 

 black color, the thorax punctured and rough, 



the abdomen smooth, shining and pointed. Fig. 71;. t^ „, , 



_- , u ,■! L , -.r J ^10. 74.— IcHXEUMON- Fly. 



Of course, they should not be killed. Parasite of the Gall Fly. 



Fig. 73. 

 Parasite of the Gall Fly, 



