Plate LXIV 

 the hog louse, haematopinus suis linne * 



1, Reproductive organs of male (a, testes; b, vasa deferentia; c, seminal vesicles; d, ejaculatory duct; e, 

 penis; f, vesica penis; g, basal plate; h, parameres); 2, ectodermal reproductive organs of male in resting 

 position, dorsal aspect (lettering as- in 1); 3, ectodermal reproductive organs of male, vesica extended, 

 ventral aspect (lettering as in 1); 4, posterior region of abdomen with vesica and penis ejected, lateral 

 aspect (B, caudal aspect; 1, upgrowth of ventral lamella of basal plate, corresponding to collar described 

 by Nuttall in Pediculus; lettering otherwise as in 1) ; 5, transverse section through posterior end of abdomen 

 of male (e, penis; f, vesica penis; ga, dorsal lamella of basal plate showing thickening of parameres; gb, 

 ventral lamella of basal plate; i, muscles of parameres; j, retractor muscles of vesica; k, protractor muscles 

 of batsal plate); 6, transverse section of " spermatophore " (drawn with oil immersion) 



738 



