322 
Hermaphroditism etc. in Pediculus 
Abnormalities of spiracles and pleural plates. 
In Lot N. 280, P. humanus race corporis, from a Mkamba native, Nairobi, 
British East Africa, we found a darkly pigmented male with atrophied 
pleural plates on the first two abdominal segments of the right side and on 
the first segment of the left side. The spiracles connected with these plates 
are likewise more or less atrophied. 
In Lot N. 285, P. humanus race capitis, from natives, Bogota, Central 
America, we found a female having the third and fourth spiracles of the right 
Text-fig. 28. Pediculus humanus, cross between capitis and corporis, Specimens 120, 121. 
Anterior portion of head in two specimens (A) and (B). Ventral aspect, showing hyper¬ 
trophied sensory hairs. (C) detail from specimen (B) showing nerve ending (/?.). (N. del.) 
side atrophied and non-functional; the pleural plate connected with the third 
spiracle is obsolete, that connected with the fourth is much reduced. 
Abnormality in structure of peri-buccal hairs. 
(Text-fig. 28.) 
The anterior part of the head in P. humanus, as we know, bears a number 
of symmetrically disposed sensory hairs. Among Bacot’s hermaphrodites 
(Specimens 120, 121) we found two examples wherein extraordinary club- 
