The Life-History and Anatomy of Butterflies 
Fig. 3. —Egg of Papilio 
turnus , greatly magnified. 
times they are ribbed, the ribs running from the center out¬ 
wardly and downwardly along the sides like the meridian lines 
upon a globe. Between 
these ribs there is fre¬ 
quently found a fine 
network of raised lines 
variously arranged. 
Sometimes the sur¬ 
face is covered with 
minute depressions, 
sometimes with a 
series of minute ele¬ 
vations variously disposed, 
great variety in the form of the eggs, so 
also there is great variety in their 
color. Brown, blue, green, red, and 
yellow eggs occur. Greenish or 
greenish-white are common tints. 
The eggs are often ornamented with 
dots and lines of darker color. Species 
which are related to one another show 
their affinity even in the form of their 
eggs. At the upper end of the eggs of insects there are one or 
more curious structures, known as micropyles (little doors), 
Fig. 4. — Egg of Anosia 
As there is P!**PP *. magnified jo 
diameters (Riley). 
Fig. 5.—Egg of Anosia 
plexippus , natural size, on 
under side of leaf (Riley). 
Fig. 6.—Egg 
of Anthocharis 
genutia, magni¬ 
fied 20 diameters. 
Fig. 7.—Turban-shaped 
egg of Lyccena pseudar- 
giolus, greatly magnified. 
Fig. 8.—Egg of 
Melitcea phaeton, 
greatly magnified. 
through which the spermatozoa of the male find ingress and they 
are fertilized. These can only be seen under a good micro¬ 
scope. 
The eggs are laid upon the food-plant upon which the cater- 
4 
