306 
Hermaphroditism etc. in Pediculus 
as in ventral muscles invisible. Internal organs: vagina and uterus of 
normal structure, the uterus containing a large operculated egg and connected 
laterally with two well developed accessory glands; a few other large eggs 
occupy the abdomen. Dorsally to the vagina is seen a large vesicula seminalis 
of abnormal shape (compare Text-figs. 20 and 1 on p. 281). The specimen 
appears to occupy an intermediate position between our specimens included under 
Group I and Group II respectively (see p. 286). 
SPECIMENS 120-121 of <$ type have the $ characters represented by the 
structure of leg III and the ? genitalia which, in No. 120, are reduced to 
three chitinous invaginations with sensory hairs, in No. 121, to a polypoid 
mass spread across the segment. These specimens are of interest because of 
the presence on them of hypertrophied peribuccal hairs which are described 
on pp. 322-323 and shown in Text-fig. 28. 
Text-fig. 21. Pediculus humanus, cross between capitis and corporis. Specimen 136, I, of the F 3 
generation, posterior end of abdomen with rudiments of $ genitalia partly invaginated, 
partly evaginated. (K. del.) 
Family P (F 3 generation). 
This family consists of 16 dd, 31 $$ and 15 hermaphrodites. 
SPECIMENS 122-130, namely 9 examples, are of £ type, the £ characters 
being the d structure of leg I, the dorsal bands, these being fragmented and 
in some cases reduced to two or three spots. Some of the specimens contain 
two to four operculated eggs. 
SPECIMENS 131-136, namely 6 specimens, are of § type with $ characters 
comprised in the structure of leg III. The $ genitalia are reduced to variously 
devaginated or invaginated structures (Text-fig. 21). 
