654 Laura Florence 



abdomen. Anteripr 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 nimiber 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 Mjoberg (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. Thej^ 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. Antcriorlj^ the}^ are joined by a fold of 

 the integument which projects caudad in two blunt points (Plate LVHI, 11). 

 They have arisen, apparently, as an infolding of the integmnent of the 

 segment, and may be considered homologous with the gonopods of the 

 Trichodectidae as described by Morse (1903:609). 



XHE 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 Mjoberg (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 



