FIELD BOOK OF INSECTS. 



Plate CI: Schizomyia pomum (Fig. i), 

 Grape variable, with 8 or 9 ridges when mature, 



numerous longitudinal cells each divided by a partition; 

 Cecidomyia viticola (Fig. 2), green or red; Lasioptera vitis 

 (Fig. 3), yellowish-green or reddish, on stems and leaf- 

 stalks. S, coryloides makes a rounded mass, about 2 

 inches in diameter, of from 10 to 50 opaque, woolly, rather 

 spindle-shaped, green galls. Aster omyia petiolicola makes 

 spindle-shaped swellings on the petioles. For Phylloxera 

 vastatrix see page 88; the leaf-galls are hollow, fleshy 

 swellings, which are rather wrinkled and hairy, on the 

 under surface of leaves, opening above. 



Plate CI, Fig. 4: Cecidomyia impatientis, 

 Touch-me-not succulent, semi-transparent, containing a 

 number of cells, at base of flower of Impatiens. Lasi- 

 optera impatientifolia causes a swelling of the base of leaves. 



Plate CI, Fig. 5: Cecidomyia verrucicola, 

 wart-like, about a fifth of an inch in di- 

 ameter, usually formed in July. Ceci- 

 domyia citrina deforms young terminal buds; Eriophyes 

 abnormis, top-shaped galls on the under side of leaves. 



Plate CI, Fig. 6: Lasioptera clavula, 

 Dogwood contains an elongated channel inhabited 



by a single larva. 



Plate CI, Fig. 7 : Solenozopheria vaccinii, 

 Huckleberry Qn stems of V actinium ; the illustration 



shows an old gall with exit holes. 



Plate CI, Fig. 8: Aulax tumidus varies 

 reatly, on main stal 

 often involving the flower-panicle. 



. ettuce greatly, on main stalk of Lactuca canadensis, 



470 



