D. Keilin and GL H. F. Nuttall 285 
We hope soon to be able to study fresh material and thus obtain a further 
insight into the internal anatomy of the hermaphrodites. 
To obtain an accurate survey of the very varying structures observed 
in the individual hermaphrodites, we made systematic notes on each specimen 
and drawings of most of them. The drawings were all executed by ourselves 
with the aid of the camera lucida, and the accompanying illustrations represent 
a selection from the many we have made. Whereas the plates represent, 
as nearly as practicable, the natural appearance of the specimens, the text- 
figures are mostly somewhat schematized in so far as the deeply pigmented 
chitinous plates, pleurae, gonopods, etc. are represented in black. 
Material. 
The hermaphrodites and other abnormalities about to be described were 
derived from the following sources: 
lot (a) Specimens raised in Cambridge. 
265. Corporis of British origin, bred in the Quick Laboratory; having been 
raised on black cloth they were darkly pigmented. Six hermaphro¬ 
dites (Nos. 4, 18, 21, 23, 24, 29). 
(b) “Wild” lice collected abroad. 
237. Capitis 4- corporis , from negro, Nairobi, British East Africa. The lot 
consisted of 94 <4, 120 $, and 2 hermaphrodites (Nos. 12, 31). 
277. Corporis , from Kikuyu negro, Nairobi, British East Africa. The lot 
consisted of 94 <$, 151 ?, and 2 hermaphrodites (Nos. 8, 13). 
278. Corporis, from Kikuyu negro, Nairobi, British East Africa. The lot 
consisted of 141 <J, 224 $, and 1 hermaphrodite (No. 11). 
257. Capitis, from Masai negro, Tanga, German East Africa. The lot 
consisted of 71 $, 102 $, and 2 hermaphrodites (Nos. 20, 22). 
273. Corporis, from asylum patients, .Sydney, New South Wales. The lot 
consisted of 65 d, 134 ?, and 19 hermaphrodites (Nos. 1, 2, 3, 5, 6, 
7, 9, 10, 14, 15, 16, 17, 19, 25, 26, 27, 28, 30, 32). 
The 32 hermaphrodites included in the foregoing list, (a) and (6), are 
described in the order of the numbers bracketed after the data regarding 
their source. 
(c) Bacot’s material. 
This material was derived from various crosses between capitis and corporis 
raised by Bacot in London. As a full record thereof will be found on p. 315, 
316, it will suffice here to state that the material was found by us to comprise 
123 hermaphrodites. 
