The Life-History and Anatomy of Butterflies 



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, 



sorn etimes with a 



turnus, greatly magnified. 



series of minute ele- FIG. 4. Eggof/inosia 

 vations variously disposed. As there is Pappus .magnified 30 



J diameters (Riley). 



great variety m 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 



FIG. 5. Egg of Anosia 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), 



X <-J*^r 



plexippus, natural size, on 

 under side of leaf (Riley). 



FIG. 6. Egg 

 of Anthocharis 



fenutia, magni- 

 ed 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- 



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