8 
THE GRAPE ROOT-WORM. 
Page. 
Fig. 4. The grapevine flea-beetle (Halticachalybea): Adult 16 
5. The rose-chafer ( Macrodactylus subspinosus) : Adult or beetle 17 
6. The redheaded Systena (Systena frontalis): Adult or beetle 18 
7. The grapevine Colaspis (Colaspis brunnea): Adult or beetle 18 
8. The grape root- worm (Fidia viticida): Larva and details 19 
9. The grape root- worm : Pupa and details 19 
10. The grape root- worm: Adult or beetle 20 
11. The grape root- worm: Structural parts of beetle 21 
12. Diagram showing time and development of a single individual of the 
grape root-worm under average conditions, as observed in 1909, at 
North East, Pa 23 
13. Curve showing time and relative emergence of beetles of the grape root- 
worm from the ground in rearing cages at North East, Pa., 1909 24 
14. Curves showing variations in time of emergence of beetles of the grape 
root- worm from different kinds of soil. From rearing experiments 
during 1909 at North East, Pa 25 
15. Curve showing time of egg deposition and relative abundance of eggs 
laid in rearing cages by beetles of the grape root- worm at North East, 
Pa., during 1909 32 
16. Diagram showing variation in time of emergence of beetles of the grape 
root- worm during 1907, 1908, and 1909, at North East, Pa 42 
17. Temperature curves showing the daily records of the maximum and 
minimum temperature during the breeding period of 1909 at North 
East, Pa 43 
18. Portion of the outdoor rearing shelter used in the rearing of insects at 
North East, Pa., during 1909 45 
19. Wooden-frame box with glass bottom and wire-screen cover used in 
studying the pupal stage of the grape root- worm beetle 45 
20. Earthen pot with glass cyclinder used in rearing the grape root- worm. . 46 
21. Rearing cage with glass sides used in the study of the larva of the 
grape root- worm beetle 47 
22. Earthen pot with wire-screen cover used in rearing the grape root- 
worm 48 
23. Diagram illustrating seasonal history of the grape root- worm as observed 
during 1909 at North East, Pa 49 
24. Fidiobia flavipes, an egg-parasite of the grape root-worm: Adult and 
enlarged antenna 52 
25. Diagram showing the relation between the three generations of the 
Fidiobia parasite and the relative occurrence of eggs of the grape 
root- worm at North East, Pa., during 1909 55 
26. Larva of an undetermined insect parasite of the eggs of the grape root- 
worm 56 
27. Lathromeris fidise, an egg-parasite of the grape root- worm: Antenna and 
forewing 57 
28. Horse hoe used in removing the soil from beneath the trellis in vine- 
yards 61 
29. Young grapevine, unsprayed, showing extensive feeding by beetles of 
the grape root- worm. North East, Pa., 1909 66 
30. Young grapevine sprayed with arsenate of lead against the beetles of the 
grape root- worm. North East, Pa., 1909 87 
31. A large nozzle of the cyclone type 89 
