Pirate LXIV 
THE HOG LOUSE, HAEMATOPINUS SUIS LINNE 
1, Reproductive organs of male (a, testes; b, vasa deferentia; ce, 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 basal plate); 6, transverse section of ‘“‘ spermatophore ”’ (drawn with oil immersion) 
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