A pair of freshly laid Wood White ovum that have yet to dry.
|Two very freshly laid ovum on the underside of a Bird's-foot Trefoil leaf|
|A white Wood White's ovum on Meadow Vetchling|
|A Wood Whites ovum having turned yellow|
However, ovum that are laid by the 2nd brood female Wood Whites, are orange 24 hours before the larva emerge. Because the membrane/skin of the ovum is transparent this is the colour of the larva inside the egg. This colouring only occurs with the ovum/larva that are laid by 2nd brood females.
|A Wood White 2nd brood ovum 24 hours before the larva emerges|
And finally the tiny orange 1st instar larva still inside the ovum.
The ovum of the Speckled Wood is laid on various types of common grass, including Cock's-foot and False Brome, usually in warm sheltered places with very little or no sun by females laying late summer. Eggs being laid in May can be deposited in much sunnier places than ones laid later in the season.
The ovum is white when laid and stays white for the duration of this stage, [even though they sometimes seem to have a lightish green tint to the colour of the ovum. This can be caused by light refraction] until about 24 hours before the larva emerges, when you can see the larva through the transparent membrane/skin of the ovum. Which has a black head and, a white body covered in black spots.
|A speckled Wood ovum thats seems to have a slight green tinge to it,|
this is most probably caused by light refraction.
|The tiny larva is easily seen through the transparent membrane/skin of the ovum 24 hours|
This period lasts about 10-14 days depending on the time of year, whether the egg was laid in early or late summer. These times can also vary because of weather conditions, hot, cold etc.