THE CANADIAN HORTICULTURIST. 



103 



expanded the female fly begins to lay 

 her eggs on the under side of the leaf, 

 in a row on the ribs or veins of the 



Perfect Insect ok the Gooseberry Saw-Fly. 



leaves. The eggs may be seen at figure 

 1 in the accompanying cut, arranged in 



Lbaf, with the Egos. 



a row along the central leaf-vein and 

 its branches. In from eight to twelve 

 days the caterpillare are hatched, and 

 set to work at once to eat small holes 

 in the leaf, which are shown at figures 

 2 and 3. They feed in company, with 

 from twenty to forty on a leaf, and 

 therefore soon completely consume all 



the soft parts of the leaf, so that only 

 the veins are left remaining. Increas- 

 ing in size tliey part company and 

 spread over the plant, eating as they go. 



Thus we have given briefly the life 

 history of this insect, from which it 

 will be seen that the caterpillars do not 

 crawl up the stem of the plant but 

 commence their existence on the under 

 side of the leaves. 



We have a native Saw-fly that feeds 

 on the gooseberry, bit which has not 

 been such a pest as the imported. 

 Figure h in the accompanying illustra- 

 tion represents the female fly magnified, 



Nativk Gooseberry Saw-Fly. 



the cross lines shewing the length of 

 tlie body and the expansion of the 

 wings. Figure a represents the larva. 

 It is known by entomologists as the 

 Pristiphora grosuvlarice. The larva of 

 this insect is always green, never having 

 the black dots of its imported cousin, 

 and always constructs its cocoon above 

 ground among the leaves and twigs of 

 the bush on which it feeds. This insect 

 is said to be common and so ne'imes 

 troublesome in New York and Illinois. 



There is yet another insect that is 

 often called the Currant Worm, known 

 to entomologists as the Abraxis ribearia. 

 It is a sj)an or measuring wonn, and is 

 designated in the Reports of the En- 

 tomological Society of Ontario as tlie 

 Currant Geometer or Measuring 

 Worm. 



The accompanying cut shews the 

 worms in various positions. Figure 1 



