566 Mr. Harold Powell on the 
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OvuM : 
Shape.—Squat, greatest horizontal diameter at a point nearer 
the base than the top. The base is broad, rounded off, and with 
a shallow central depression. The upper portion of a flattened 
dome shape; micropylar cup fairly broad but not very deep. 
Height, °7 mm.; greatest width, 6 mm. 
Sculpturing.—About 21 main ribs start from near the base and 
run up rather irregularly towards the rim of the micropylar cup, 
but sometimes two will join together on the way up, so that fewer 
reach the rim than left the base. Some do not go beyond the 
junction. These ribs sink and disappear before the base is reached. 
Base fairly smooth. Between the main ribs are the usual smaller 
transverse ribs, forming oblong, irregular cells. They also diniinish 
in height towards the base. In the centre of the micropylar cup is 
a rosette of very small cells, which appears to be slightly raised. 
The ribs are not sharp-edged, and though very distinct, are not high. 
Colour and Surface Appearance.—When first laid they are almost 
pure white. The next day they are very pale creamy white and 
pearly. Some found which had certainly been laid several days 
before, did not differ much from egys just laid. On May 17th I 
found that all the eggs had turned a pale orange yellow, and that 
those on the flowers were more difficult to see in consequence. They 
were generally well sprinkled with pollen. 
On May 19th the orange-yellow colour was rather deeper. The 
colour did not deepen after this, but about a day before hatching 
the black head of the larva, showing through the eggshell, formed a 
large, dark leaden patch at the top. 
An egg which I saw laid on May 14, hatched between 
the afternoon of May 22 and the morning of the 28rd. 
Most of the other eggs hatched on the 23rd, which makes 
it probable that few of them could have been very long 
laid when I found them on the 14th. 
The larva eats a large circular piece out of the top of 
the egg, but after emerging it does not finish up the egg- 
shell. It is active and restless, spinning silk as it moves 
about. One under observation has settled down on a 
division of one of the upper leaves, and is drawing the 
edges together with silk. The green tinge of the body of 
another specimen shows that it has already fed. 
First stage-—The colour of the body is straw yellow before the 
young larva has taken its first food. I made some notes on May 
30th on a specimen which was then resting for the first moult. They 
are as follows :— 
