Mouthparis of Pediculus 
108 
Figs. IV, V. Pediculus humanus. Series of transverse sections of mouth-parts. Drawings, 
slightly schematic, from slightly oblique sections; some sections, particularly the 
posterior ones, show some shrinkage and displacement; the mouth-parts are shown in black; 
sections 9 to 25 refer to the stabber-sac. 
d.s.r. anterior retractor muscle of stabber-sac; a.v.st.r. retractor muscle associated with posterior 
retractor of the stabber-sac and the ramus of the dorsal element of the ventral stabber. 
b.f. buccal funnel; b.fs. buccal festoons; d. denticles; d.st. dorsal stabber; d.s.pr. dorsal portion 
of the protractor muscle of the sac; d.r.v.st. ramus of dorsal element of ventral stabber; 
d.st.r. retractor muscle of dorsal stabber; f.t. fibrous tissue; h. haustellum; h.g. hinge of 
dental plate; l.fi.gr. lateral floor groove of stabber-sac; o.P.gl. region of orifice of Pawlowsky’s 
glands; o.ph.t. origin of pharyngeal tube; o.s.t. origin of sac tube; ph.t. pharyngeal tube; 
pp. pumping-pharynx; p.s.r. posterior retractor muscle of stabber-sac; p.v.st.r. retractor 
muscle associated with the retractor muscle of the dorsal stabber and the posterior of the 
ramus of the lower element of the ventral stabber. s.pr. protractor muscle of the stabber-sac; 
v.st.r. retractor muscle of the ramus of the dorsal element of the ventral stabber; v.r.v.st. 
ramus of ventral element of ventral stabber. 
EXPLANATION OF TEXT-FIGURES. 
Figs. IV—V. 
Section 1. Dental region; stabbers shown also on larger scale; dorsal stabber broken, d.st. 
dorsal stabber; v.st. ventral stabber; h. haustellum; d. denticles. 
