N. ClJNLIFFE 
23 
SECTION II. STRUCTURE OF 0. SAVIGNYI. 
Observations on the dimensions of the egg and unfed specimens of the 
different stages and the changes in form undergone during development by 
the hypostome, the fourth tarsus and the spiracle are included in this section. 
Dimensions of the egg. 
A total of 179 eggs were measured immediately after deposition by four 
different females, the minimum, maximim and mean measurements of length 
x breadth being 1-0 x 0-9, 1*8 x 1-4 and 1*4 x M mm. respectively. The 
minimum and mean measurements of the eggs of this species equal the mean 
and maximum measurements of those of 0. moubata. 
Dimensions of unfed stages. 
As no records of the dimensions of the different stages appear in the litera¬ 
ture on this species, measurements of material bred under control from one 
stock are summarised in Synopsis III. The number of individuals preserved 
was, in several cases, too small to give very accurate results, although as far 
as possible extreme examples were chosen for preservation. 
Synopsis III. Dimensions of stages. 
Measurements in mm. to nearest tenth, from unfed specimens preserved shortly 
after emergence in 70 % spirit. 
No. of 
Min. 
Max. 
Mean 
individuals 
Stage 
Length x Breadth Length x Breadth Length x Breadth 
observed 
Larva 
1-2 x 10 
1-5 x 1-2 
1-4 x 1-1 
52 
1st ® 
1-3x10 
1-8 x 1-4 
1-5 x 1-2 
107 
2nd ® 
1-5x11 
2-6 x 1-9 
2-1 x 1-5 
119 
3rd ® 
2-2 x 1-5 
3-6 x 2-6 
30x2-1 
16 
4th ® 
3-1 x 2-3 
5-6 x 3-9 
4-4 x 3-1 
14 
o from 3rd ® 
5-2 x 3-8* 
6-0 x 4-3 
5-7 x 4-0 
3 
5th ® 
3-9 x 2-8 
6-5 x 4-6 
5-6 x 3-9 
7 
from 4th ® 
5-2 x 3-5 
6-7 x 4-6 
6-0 x 3-9 
25 
$ from 4th ® 
7-0 x 4-9* 
7-8 x 5-6 
7-4 x 5-2 
4 
6th ® 
5-0 x 3-4 
8-5 x 5-7 
6-7 x 4-8 
6 
<$ from 5th ® 
5-8 x 3-8 
7-4 x 5-6 
6-5 x 4-7 
15 
$ from 5th ® 
6-7 x 4-7 
9-2 x 6-7 
8-1 x 5-7 
14 
7th ® 
— 
— 
— 
$ from 6th ® 
6-4 x 4-4 
9-3 x 6-7 
7-8 x 5-5 
2 
* Probably not true minima. 
As in 0. moubata , there is 
considerable variation in the size 
of individuals 
of any one stage, maximum measurements in one stage exceed minimum 
measurements in the succeeding stage, and males of any one stage are on 1 \ 
slightly larger, whereas females are distinctly larger, than nymphs of the 
equivalent stage. In 0. moubata, the greatest growth took place in the second 
nymphal stage but in this species it would appear to be spread equally over 
the second and third nymphal stages, the percentage increases in length being 
7-3 (larva to 1st O), 40-0, 42*8, 46-7, 27-3, 19-7 (5th to 6th O), while the 
