290 
Hermaphroditism etc. in Pediculus 
(c) With d genitalia complete, the $ genitalia being represented by a unilateral 
gonopodial invagination. 
SPECIMEN 12, f Pis. XII, XIII, XVI, fig. 2 and Text-fig. 8. 
Deeply pigmented specimen. Dorsal bands fragmented (PI. XII). Legs: 
pair I as in £ but modified. $ genitalia normal. S ventral plate (PI. XVI, 
fig. 2) divided in two separate portions of 
small size and irregular form. $ ventral plate 
small, irregular, to the left of it a small curved 
chitinous structure surrounded by several con¬ 
centric ridges of the surface; this structure 
being a rudimentary gonopod which we term 
a gonopodial spot ( gon.s .). The segment be¬ 
hind the ventral plate shows a corrugated 
surface. To the right of the <£ and $ ventral 
plates there are three slightly chitinized 
areas. Dorsal abdominal muscles apparently 
as in 3, the ventral as in $ capitis (Text- 
fig. 8). Internal organs (PI. XIII): three 
testes ( t .), two on the left side, widely apart, 
one on the right, all being pushed out of their 
Text-fig. 8. Pediculus humanus race normal position; vesicula seminalis ( v.sem .) 
caj)itis$. Specimen 12 (alsofigured -.i i j / 7 \ j j j. 
. „ TTT ' _ ® with accessory glands ( acc.ql .) and ductus 
Cleared, showing certain abdo- ejaculatonus (d.ej.) pushed into oblique posi- 
minal muscles. (K. del.) tion. The specimen shows, moreover, two 
large, completely formed ova ( ov.) with oper- 
cula and micropyles, a portion of ovarial tube with young ovules, follicular 
and nutritive cells. The malposition of the <$ sexual organs is attributable to 
pressure from the eggs which could not be expelled from the insect’s body. 
SPECIMEN 13, PL XIV. 
Very pale specimen. Legs: pairs I and III as in but pair I somewhat 
modified. genitalia apparently normal. $ ventral plate entire, unpigmented. 
$ genitalia represented only by a unilateral invagination (gon. invag.) on the 
left side of the body in the form of a chitinized sack with sensory hairs inside. 
Dorsal and ventral abdominal muscles as in Internal organs: one small 
spherical testis (t.) on the right side, vesicula seminalis somewhat deformed 
and displaced by numerous eggs (ov.) of which 6 are well developed and show 
opercula with micropyles. 
SPECIMEN 14, f PI. XVII, figs. 2, 3. 
Well pigmented specimen. Dorsal bands as in Legs: pair I as in <3, 
pair III as in $. (J genitalia apparently normal. $ ventral plate entire. 
