ORDER HYMENOPTERA. 33 



JFajJiily 26, Tenthredi?iidcB. — This is a very extensive family and 

 contains the numerous species of Saw Flies, so called because their 

 ovipositor is in shape somewhat like a saw in appearance. 



Probably the best-known species is the Gooseberry Saw Fly 

 (^Nematus ventricosiis), whose speckled and green larvce. are so 

 injurious in gardens and orchards. This insect is yellowish in 

 colour, and about a quarter of an inch in length. 



Tenthi-edo cethiops, a small black species, deposits its eggs upon 

 fruit trees. 



Many other species live on different kinds of plants and trees. 



