PLATE I. Parasitica. 



1. Pediculus capitis DeGeer, — head louse of man, x i6. 



2. Pediculus corporis DeGeer, — cootie, or body louse of man, x. 



12. 



3. Linognathus piliferus Burmeister, — dog louse, x 21. 3. 



4. Linognathus vituli Linnaeus, — long-nosed ox louse, x 18. 4. 



5. Linognathus vituli Linnaeus, — eggs, x 11. 3. 



6. Haematopinus eurysternus Nitzsch, — short-nosed ox louse, x. 



7. Haematopinus suis Linnaeus, — hog louse, x 9. 2. 



8. Phthirius pubis Linnaeus, — crab louse of man, x 16. 7. 



Photographs, 8 by H. A. Doty; others by B. H. Walden. 



