308 
Hermaphroditism etc. in Pediculus 
mentary gonopods are widely apart with the prolapsed vagina filling the 
interspace, whilst the posterior abdominal lobes appear normal. Anterior 
to the 3 ventral plate there is a chitinous invaginated sack with sensory 
hairs (invag. £), the sack undoubtedly representing a part of the $ genitalia. 
Internal organs: two testes were observed on the left side, being apparently 
fused, also a small testis on the right side. 
Family R (F s generation). 
This family consists of 52 <&?, 8 $$ and 2 hermaphrodites. 
SPECIMENS 150-151. Both of $ type. 
No. 150 has fragmented dorsal bands, leg I as in <$, leg III as in $. S 
genitalia complete, with dilator end and penis protruded; d ventral plate 
bipartite and reduced to a small spot on the right side whilst fused with the 
$ plate on the left side to form a very large lateral extension. Gonopods 
normal. 
No. 151 shows no $ genitalia; the $ genitalia are distorted and im¬ 
prisoned in the body. 
Family S (F s generation). 
This family consists of 7 <$<$, 32 $$ and 4 hermaphrodites. 
SPECIMENS 152-153, namely 2 examples, are of £ type with $ characters 
represented by dorsal bands and the structure of leg I. The posterior 
abdominal lobes are of irregular shape. 
SPECIMENS 154-155, 2 examples, are of £ type with $ genitalia more 
or less normal, the $ characters being the form of leg III and the invaginated 
remains of $ genitalia. 
GENERAL CHARACTERS OF HERMAPHRODITES IN 
P. HUMANUS. 
In considering the general character of the hermaphrodites we shall 
commence by dwelling upon certain parts of their anatomy that have under¬ 
gone special modifications consequent upon the condition of hermaphroditism. 
The various structures, for convenience sake, are considered in the following 
sequence: 
Dorsal bands. 
Dorsal bands, normally, only occur in males (Text-fig. 2), although they are 
not always distinct. Thus, in unpigmented specimens, they can only be dis¬ 
cerned if viewed by reflected light, when they appear as smooth glossy areas 
upon the otherwise rugose surface of the dorsal side of the abdomen. In well 
pigmented hermaphrodites the bands may have a normal structure, being 
complete, or they may be either frayed, fused, or fragmented (Text-figs. 9, 
12, 6). In the latter case, the fragments may be of irregular form and of very 
