706 LAURA FLORENCE 
the duct they interlace, giving the appearance of a network near the 
epithelium. The slender part of the ejaculatory duct has a small, round- 
celled epithelium, but in one quarter of the wall it is thickened and 
projects into the lumen as a more or less blunt cone, which, in the passing 
of the duct to the penis, forms its dorsal wall. 
In gross dissection of the parts no accessory glands have been found. 
Patton and Cragg (1913:559) describe and figure small glands in Pediculus 
vestimenti at the junction of the vasa deferentia with the seminal vesicles, 
but such are not present in Haematopinus. Nuttall (1917 a:308) mentions 
the accessory glands of Pediculus as lying on the muscle of the dorsal 
surface of the basal plate and undergoing passive movement along with 
the ejaculatory duct and the penis at the extrusion of the copulatory 
apparatus, but no such glands have been found in Haematopinus. It 
may be that the place of accessory glands has been taken by the enlarged 
glandular epithelium of the different parts of the ejaculatory duct. 
Female 
From the work of Landois (1864:14 and 1865 a:48) it has long been 
known that the Pediculidae possess polytrophic egg tubes. Graber 
(1872:159) differed from Landois in his conception of the egg tubes, 
and described them as telotrophic like those of the Hemiptera but gave 
no figures, and subsequent work has shown him to be wrong. Strébelt 
(1882, English trans. 1883:94) made the earliest reference to the ovaries of 
Haematopinus suis, and he described them as bilocular. His findings in 
regard to the structure of the tubes and the development of the eggs 
confirmed the work of Landois. The classic work on the ovaries of 
Siphunculata (Anoplura) and Mallophaga is that of Gross (1906:347) 
in which he showed the close resemblance between the two groups. He 
studied four species, of which Haematopinus suis was one, and described 
in detail the gross anatomy and histological structure of the ovaries 
and the development of the egg. Myjéberg (1910:253) cited the work of 
Gross but did not himself mention the female reproductive organs of the 
hog louse. The female reproductive organs of the Pediculidae affecting 
man have been described by Pawlowsky (1908), who illustrated his 
work with transverse and longitudinal sections (Pl. II and III, figs. 4-12, 
of reference cited) but included no drawing of the gross anatomy; 
by Patton and Cragg (1913:560), who figured and briefly described the 
