146 
Purported New Species , etc. 
with the size of the males, beginning with the smallest. Where measurements 
of males are lacking, those of the females are ranged in what appears to be a 
suitable place. In some of Fahrenholz’s measurements I have omitted the 
second decimal figure. I omit so-called “average' 5 measurements given by 
different authors, recording only those showing the range in size, smallest to 
largest, observed in both sexes. Apart from my hitherto unpublished figures, 
those of Sikora bearing on capitis are the only ones regarding which a state¬ 
ment is made as to the number of individuals measured. 
Table. 
Giving the body-length of the smallest and largest specimens of different 
forms of Pediculus humanus measured bv various observers and the author. 
» «/ 
My measurements were made on well-preserved alcohol specimens. 
Length of 
cf in mm. 
Length of 
? in mm. 
Name 
Number 
examined 
Author and remarks 
2 0 -2*7 
2-4 -3-4 
capitis 
104 S 
123? 
Sikora, ix. 1917 
21 -2-3 
2-3 -2-8 
“capitis maculatus" 
V 
Fahrenholz, x. 1916, “shorter 
21 -2-6 
2-2 -3-3 
capitis 
85 c? 
81? 
than angustus ” 
Nuttall, Lot 208, woman, 
2-1 -2-8 
2-2 -3-7 
corporis 
27 c? 
77? 
Cambridge 
Nuttall, Lot 204, woman, 
21 -2-8 
2-4 -2-9 
corporis 
137 c? 
94? 
Lambeth 
Nuttall, Lot 265, Lab. Stock 
— 
2-19-2-85 
“ friedenthali"* 
Fahrenholz, x. 1916. Host: 
2-19-2-39 
2-67-306 
“ capitis angustus ” 
? 
Hylobates 
Fahrenholz, x. 1916, “scarcely 
2-2 -2-3 
capitis * 
3c? 
as large as European capitis'' 
Nuttall. Hosts: A teles ater and 
2-4 -2-66 
“ assimilis" * 
? 
geoffroyi 
Fahrenholz, x. 1916. Host: 
2-2 -2-5 
2-4 -3-3 
capitis* 
?c? 
11? 
Hylobates 
Nuttall, Lot 315. Host: Ateles 
2-25-30 
2-75-4 
capitis 
? 
paniscus 
Popoff, 1916 
2-35-2-9 
2-6 -3-3 
corporis 
31c? 
100? 
Nuttall, Lot 314, tramp, Cam¬ 
2-43-2-56 
2-61-31 * 
capitis 
9 
bridge 
Fahrenholz, 1912 
2-5 -2-9 
3 -3-3 
“ humanus marginatus" 
9 
Fahrenholz, x. 1916 
2-55-3-3 
2-85-3-7 
corporis 
56 c? 
52? 
Nuttall, Lot 212, London 
2-7 -3-55 
2-7 -4-2 
corporis 
220 c? 
226? 
Nuttall, Lot 252, tramp, Cam¬ 
2-74-3-6 
2-74-4-4 
corporis 
? 
bridge 
Sikora, ix. 1917 
2-75-3-75 
3 -4-75 
corporis 
? 
Popoff, 1916 
_ 
3-29-3-36 
“schdffi”* 
? 
Fahrenholz, 1912. Host: Simia 
2-9 -3-3 
3-9 -4-37 
“ humanus chinensis ” 
? 
troglodytes 
Fahrenholz, x. 1916, “dis¬ 
302-3-23 
3-55-4-20 
corporis 
? 
tinctly larger than margina- 
tus, the largest larger than 
European louse” ( vide infra) 
Fahrenholz, 1912 (European no 
3-75 
4 -4-5 
capitis f 
2c? 
2? 
doubt) 
Popoff, 1916, from Java 
* Denotes forms found on apes and monkeys. I have measured two “schaffi” ??, both 3-3 mm. 
in length/ (Fahrenholz, 1910, gives 2-7 as the length, I assume his later statement to be correct.) 
-j- If correctly determined, the size is remarkable. Thus far, in a very large material, I have 
seen no capitis approaching these in size. 
