654 LAURA FLORENCE 
abdomen. Anterior to this plate, in segments 7 and 6, the anterior end 
of the basal plate can be‘seen shining through the integument (Plate 
LVIII, 9). 
THE FEMALE 
In the female, as already said, the abdomen is longer than in the male, 
and in consequence it appears more slender. The tergites of segments 1 
and 2 are similar to those of the male. Hairs are fewer in number and 
arranged with much less regularity. The ninth segment has a deep 
indentation on the posterior median line,- and the lateral regions are 
modified into rather blunt, strongly chitinized processes pointing inward 
and slightly ventrad, apparently a modification for clasping the bristle 
during egg-laying, and, according to Mjéberg (1910:216), not unusual 
in Siphunculata (Anoplura). On the dorsal surface of the segment there 
is a strongly chitinized plate extending onto each projection, and between it 
and the edges of the indentation is a row of stout hairs (Plate LVIII, 10). 
On the ventral surface the gonopods lie on segment 8. They present a 
striking contrast to those of the pediculi infesting man, in that they are 
' quite flat and lie widely apart. They are flat processes, narrowing 
posteriorly, and their median free border is somewhat strongly chitinized 
and set with a row of stout hairs. Anteriorly they are joined by a fold of 
the integument which projects caudad in two blunt points (Plate LVIII, 11). 
They have arisen, apparently, as an infolding of the integument of the 
segment, and may be considered homologous with the gonopods of the 
Trichodectidae as described by Morse (1903:609). 
THE INTEGUMENT AND BODY WALL 
The integument is tough rather than hard, and chitin is well developed 
only in certain clearly defined regions. Sculpturing of the cuticula, 
described by Myjéberg (1910:185) as typical of most Siphunculata 
(Anoplura), is absent from this species. In the head the cuticula is 
strongest along the sides, where the muscles controlling the backward 
movements of the pharynx are inserted, and in two transverse bars — one 
in the region of the clypeus, where the muscles of the pumping pharynx 
are inserted, and a second in the frons, where the muscles of the true 
pharynx are inserted 
Where the head passes into the thorax a ring of chitin forms the neck, ° 
and from its median dorsal surface two chitinous processes extend into 
