10. 



THE EGG. 



peror butterflies (Chlorippe) [see Figs 183, 

 185], where the longitudinal ribs and the cross- 



FIG. 16. Egg of Basilar- 

 chia Archippus, a, X 30 ; 

 ft, natural size, on under 

 surface of leaf (Riley). 



ridges are almost equally close, no such appear- 

 ance is produced, on account 

 of the proportionally greater 

 prominence of the longitudi- 

 nal ribs. 



Most of these egg-shells are 

 opaque ; or, if transparent, 

 are so covered with raised 

 ridges in the form of ribs or 

 cell- walls as to render an ex- 

 amination of the eggs very 

 not im- 



FIG. 17. Eg? of Danais 

 Plexippus, x 30 (Riley). 



difficult, though 



possible to the determined 



naturalist. Still, whether 



from this difficulty or by 



mere chance, very little is 



actually known of the 



changes undergone by the 



yolk and the surrounding parts, and of the for- 



Fm. 18. Egg of Danais Plexip- 

 pus>, nnt. size, on under surface of 

 leaf " 



