Fig. 39.—Lophryus Pini (Mag.)
Fig. 40.—Pamphilius Faustus (Mag.)
Another species which occurs in this country is the Sirex juvencus, of a steel-blue colour, but smaller than the former.
Family 26, Tenthredinidæ.—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 ventricosus), whose speckled and green larvæ are so injurious in gardens and orchards. This insect is yellowish in colour, and about a quarter of an inch in length.
Tenthredo æthiops, a small black species, deposits its eggs upon fruit trees.
Many other species live on different kinds of plants and trees.