| 
| 
4 
d 
Tn the following table, showing the results obtained, 0 in the — 
second column indicates that the eggs disappeared without hatch-— 
ing (some were attacked by mould, but the disappearance of the 
rest could not be explained). The figures in brackets after dates 
indicate the approximate number of eggs or individuals. 
The young when first observed were very small, having a body 
length of about 5 mm. Thus they were probably all in either the 
first or second instar, as newly hatched earwigs are 4 mm. long as 
a rule. 
336 Mr Brindley, Notes on the Breeding 
Hggs 
seen Young last Adult stage 
Biggs Hou hatch. | Young found seen alive attained 
ing 
1 — — Jan. 18 (23) | Feb. 7 (1) = 
2 at — |Jan. 18 (8) | Apr. 10 (2) zee 
3 os — Jan. 19 (8) | Feb. 17 (1) — 
4 — — Jan. 20 Mar. 8 (1) — 
5 -- = Jan, 23 Feb. 3 (several) — 
6 _ — Jan. 23 May 9 (1) — 
7 — _- Jan, 24 — June 17 (13,192); 
June 23 (3 more ? s); 
July 4 (1 more ?) 
8 — — Jan. 27 Mar. 22 (1) — 
9 — _ Jan. 28 (12) = July 17 (1¢) 
10 _— - Feb. 3 (c. 10) — June 25 (12) 
11 = — Feb. 7 (1) Apr. 29 (1) — 
12 — Jan. 21 | Jan. 21 Feb. 7 (several) = 
13 = Jan. 31 | Jan. 31 — June 23 (1?) 
14 | Jan. 19 (37) — — Jan. 31 (1) . — 
D5 Ig) Jee 190(09))) | eee’) () ats 
Feb. 18 (5) |Mar.15 (several) 
16 | Jan. 19 — Jan. 31 (7) | May 9 = 
17 | Jan. 19 (12) 0 0 -- aa 
18 | Jan. 24 0 0 — -- 
19 | Jan. 24 0 0 — = 
20 | Jan. 25 0 0 — = 
21 | Jan. 30 0 0 — — 
Thus greater success was obtained than in the previous © 
attempts, for in four families all stages from oviposition to maturity 
occurred in the laboratory. 
I am indebted to Mr C. B. Williams, of Clare College, for 
details of a case in which he was successful in obtaining mature 
individuals from the egg, hatching and subsequent stages being 
passed through in the laboratory of the John Innes Horticultural 
Institute, Merton. The year was the same, 1913, as my own 
observations. The dates were: 
March 8: female and 20 to 30 eggs found in a pine stump. 
