PLATE I. Parasitica. 



1. Pediculus capitis DeGeer, — head louse of man, x 16. 



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



12. 



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

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

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

 Hacmatopinus eurysternus Nitzsch, — short-nosed ox louse, x. 

 Hacmatopinus suis Linnaeus, — hog louse, x 9. 2. 

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



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



