200 
Therefore the number of moults, given hereafter, is one or two 
moults more rather than less. When the larvae bave grown larger 
and already show a distinct brown colour, these moults are easier 
to find; generally they lie on the surface of the food then. 
The investigation gave the following result. During the first period 
of strong growth a moult may be expected every fortnight ; afterwards 
this regularity ceases. 
N°. 1 gave 11 moults; larval period 400 days; died without pupation. 
N°. 2 gave 12 moults; larval period 194 days; normal pupation. 
N°. 3 gave 10 moults; larval period 194 days; normal pupation. 
N°. 4 gave 16 moults; larval period 405 days; normal pupation. 
Larva N°. 5 gave 16 moults; larval period 376 days. 
The investigation was repeated once more with 8 larvae, all of 
the same mother and of the same age. 
Number of gathered moults from Larva 
Dates of the gathering. 
N°. 1 | Ne. 2| N°. 3| N°. 4 NO, 5 | N°. 6 Ne. 7/N°. 8 
9th of November 1918 !) | | 
28th ; ‘ alae at Ok ne 1 2 1 
13th December Ri NS ON | 1 ER en 1 1 
29th 3 a eije 0 An? 0 1 1 1 2 
th Janwary gig: oT aurea et Sjeont ese eet 
31th ; 5 ce | 1 1 1 1 1 1 
14th February . | Beale BL A ae | 1 1 1 1 
28th EL E | 1 1 1 1 dwi 1 0 
14th March i ee ace OI ag 1 
SOES 9 a | 1 as a | 1 1 2 
13th April > Vaal esters | 1) On 
30th, 7 | iiss NI 1| oa en 
14th May À | 1 1 12)} 1 om | 1 1 
GI GAT ane eee | | 
Total of moults | 13 | 12 14 11 13 15 | | 13 
Duration of larval period | / 
in days. 187 | 187 | 209 | 187 | 187 | 187 | 187 | 187 
') Date of the just emerging larva. 
2) 26th May 1919. 
