Puate LXIil 
THE HOG LOUSE, HAEMATOPINUS SUIS LINNE 
1, Transverse section through stomach nine hours after feeding, x 1924 (a, region of section enlarged 
in 2); 2, region a of 1, x 600; 3, transverse section through intestine and reproductive organs of male, 
x 290 (a, intestine; b, seminal vesicles containing spermatophore; ec, muscular part of ejaculatory duct; 
d, slender part of ejaculatory duct; e, vasa deferens; f, upper region of seminal vesicles which acts as 
reservoir for spermatozoa; g, malpighian tubes; h, trachea) 
736 
