8 ILLUSTRATIONS. 
Page. 
Plate X. Fig. 1. — Burning machine experimented with as a method of 
destroying the alfalfa weevil. Fig. 2. — Boxes containing para- 
sites of the larvae and pupae of the alfalfa wee\Til, showing how 
this material was imported from Italy. Fig. 3. — Boxes of para- 
site material imported from Italy which contain egg parasites 
of the alfalfa weevil 32 
XI. Introduction of parasites of the alfalfa wee\-il. Figs. 1, 4. — Tj-pe 
of cages in which larval and pupal parasites of the alfalfa weevil 
were reared in the laborator>'. Figs. 2, 3. — Boxes sealed and 
fitted with glass tubes into which imported parasites emerged 
and were separated in the laboratory 36 
XII. Fig-s. 1, 2. — Field cages used in hibernation experiments on the 
alfalfa weevil. Fig. 3. — Planting a colony of imported para- 
sites of the alfalfa weevil in Utah in an alfalfa field 36 
XIII. Figs. 1, 2. — Laboratories of the Bureau of Entomology, United 
States Department of Agriculture, at Salt Lake City and Mur- 
ray, L'tah 40 
TEXT FIGURES. 
Fig. 1. The alialia weevil iPhytonomus posticus): Adult 10 
2. The clover-leaf weevil (Hypera punctata): Stages and work 16 
3. The alfaha weevil: Eggs 17 
4. The ahalfa wee\T.l: Larvae attacking foliage; eggs in stem 18 
5. The alfalfa weevil: Larva 21 
6. The ahalfa wee^dl: Cocoon 23 
7. The alfalfa wee\'il: Pupa. ■ z4 
8. The ahaha wee\Tl: Adults attacking sprig of alfalfa 24 
9. Xine-spotted lady-beetle ( Coccinella 9-notnta) : Adult, larva 31 
10. Convergent lady-beetle (Hippodamia convergens): Adult, pupa, larva.. 31 
11. The two-spotted CoUops (CoUops bipunctatus): Adult 32 
12. A predaceous mite, Pediculoides rentricosus: Adult female before the 
abdomen has become inflated with eggs and young 32 
13. Pediculoides rentricosus: Adult female after the abdomen has become 
inflated with eggs and young 32 
14. A predaceous mite, Erythrseus arvensis: Adult 33 
15. Anaphes sp., a mymarid egg parasite of the alfalfa wee^-il 34 
16. Imported pteromalid egg parasite of the alfalfa weevil: Adult 35 
17. Larv^a of pteromalid egg parasite of the alfalfa wee^■il 36 
18. Pupa of pteromalid egg parasite of the alfalfa weevil 36 
19. Pteromalid parasite of larva and pupa of the alfaha weevil: Adult 
female 37 
20. Pteromalid parasite of lan-a and pupa of the alfalfa weevil: Adult male. 37 
21. Pteromalid parasite of larva and pupa of the alfalfa weevil, showing eggs 
in place and enlarged figure of same 38 
22. Pteromalid parasite of larva and pupa of the alfalfa weevil, showing 
parasite larva 38 
23. Larva of pteromalid parasite attacking pupa of ahalfa weevil 38 
24. Pupa of pteromalid parasite shown in figures 22 and 23 38 
25. Canidiella curnilionis, a parasite of the alfalfa weevil: Adult female 39 
26. Itoplectis masculator. a parasite of the alfalfa wee^-il: Adult female 40 
27. Cocoon of the alfaha weevil, showing cocoon of the parasite Canidiella 
curculionis within 41 
