Part 4

XLVIII. Portion of a steer's hide showing the Texas fever tick (Margaropus annulatus) 504

XLIX. Fig. 1.--Tick-infested steer. Fig. 2.--Dipping cattle to kill ticks 504

L. Facsimile of poster comparing ticky and tick-free cattle 504

TEXT FIGURES.

FIG. 1. Hornfly (HÊmatobia serrata) in resting position 504

2. Hornflies (HÊmatobia serrata) on cow horn 505

3. Buffalo gnat 506

4. Screw worm (larva of Chrysomyia macellaria) 506

5. Screw-worm fly (Chrysomyia macellaria) 507

6. The warble fly (Hypoderma lineata) 508

7. Short-nosed blue louse (HÊmatopinus eurysternus) of cattle 512

8. Long-nosed blue louse (HÊmatopinus vituli) of cattle 512

9. Red louse (Trichodectes scalaris) of cattle 513

10. Egg of short-nosed blue louse (HÊmatopinus eurysternus) attached to a hair 513

11. Mite which causes psoroptic scab of sheep 514

12. Portion of the wall of the first stomach with conical flukes (Paramphistomum cervi) attached 519

13. Twisted stomach worms (HÊmonchus contortus) 519

14. Twisted stomach worms (HÊmonchus contortus) enlarged 520

15. Embryo of twisted stomach worm (HÊmonchus contortus) coiled on tip of grass blade 521

16. A drenching tube made from an ordinary tin funnel, a piece of rubber hose, and a piece of brass pipe 522

17. Piece of lining of fourth stomach showing cysts of the encysted stomach worm (Ostertatia ostertagi) 523

18. A tapeworm (Moniezia planissima) which infests cattle 524

19. The common liver fluke (Fasciola hepatica) 526

20. The large American fluke (Fasciola magna) 526

21. Portion of grass stalk bearing three encysted cercariÊ of the common liver fluke (Fasciola hepatica) 527

22. Hydatids (Echinococcus granulosus) in portion of hog's liver 528

23. Thin-necked bladder worm (TÊnia hydatigena) from abdominal cavity of a steer 529

24. Lung worms (Dictyocaulus viviparus) of cattle 530