ILLUSTRATIONS. 
PLATES. 
Page. 
Plate I. Leafhoppers (Eutettix spp.) and their work. Fig. 1. — Eutettix 
tenella: a, Adult: b, nymph; c, wing; d, e, genitalia; /, eggs 
(greatly enlarged); g, section of beet stem, showing fresh cgg^ in 
place; h, same, showing eggs ready to hatch; i, old egg scars on beet 
stems; j, small leaf of sugar beet, showing characteristic ; "curly- 
leaf" condition; /:, enlarged section of back of an extreme case of 
"curly-leaf," showing "warty*" condition of veins. Fig. 2. — Eu- 
tettix strobi: a, Work of nymphs on lamb's-quarters; b, work of 
nymphs on sugar beet. Fig. 3. — Eutettix scitula: Adult. Fig. 4. — 
Eutettix clarivida: a, Wing; 6, head and pronotum; c, d, genitalia. 
Fig. 5. — Eutettix nigridorsum: Work of nymphs on leaf of Helian- 
thus. Fig. 6. — Eutettix straminea: Work of nymphs on leaf of 
another Helianthus. Fig. 7. — Eutettix insaaa: Wing. Fig. 8. — Eu- 
tettix stricta: a, b, Genitalia 34 
II. Work of Eutettix tenella on sugar beet. Fig. 1. — Three "curly-leaf" 
beets, the result of attack by Eutettix tenella, and one normal beet 
from the same field, showing difference in size. Figs. 2. 3. — 
"Curly-leaf beets as seen in the field. Fig. 4. — Normal beets 
from same field 44 
III. Work of Eutettix tenella on sugar beet. Fig. 1. — A large beet becom- 
ing "curly.'' Fig. 2. — Back of a leaf affected by "curly-leaf."' 
showing "warty " condition and curled edges 44 
IV. Work of Eutettix tenella on sugar beet. Fig. 1. — A field of beets de- 
stroyed by "curly-leaf." Figs. 2, 3. — Cages used in the life-his- 
tory experiments 46 
V. Spraying apparatus used in hopyards in British Columbia 
VI. View of hopyard, showing sheep keeping down weeds 88 
VII. Method of capturing hop flea-beetles on tarred horse-sledges 90 
TEXT FIGURES. 
Fig. 1. The asparagus miner (Agromyza simplex) : Fly 1 
2. The asparagus miner: Larva, pupa, work 2 
3. The water-cress sowbug ( Mancasellus brachyurus) 12 
1. Cross section of cress pond, showing arrangement for avoiding damage 
by water-cress sowbug 13 
5. The water-cress leaf-beetle (Phsedon aeruginosa): Larva, pupa, adult 17 
6. The cranberry *\K\n\\orm (Cleora pampinaria): Moth, larva, and pupa.. 
7. The striped garden caterpillar (Mamestra legitima): Moth, larva, and 
pupa 29 
8. The semitropical army worm i [Prodenia eridania): Moth, egg, egg-maae, 
larvae 54 
