162 



THE ANIMALS AND MAN 



simply to the surface when the delicate, gauzy-winged 

 adult quickly issues. The adult Mayfly takes no food and 

 lives only a few hours, or at most a few days. The May- 

 flies have the shortest adult stage of all insects. The 

 female drops her eggs into the water. 



Moths and butterflies are among the most attractive and 

 instructive insects to collect and classify and to rear as 



caterpillars and chrysalids in the 

 schoolroom or at home. Some 

 of the most beautiful butterflies 

 and largest and most striking 

 moths are common all over the 

 country and their eggs, or cater- 

 pillars at least, can certainly be 



found and reared in simple 



.. ,, ,. . {; 



breeding-cages (for directions for 



) * making see Appendix II) in the 

 schoolroom. Directions for the 

 study of caterpillars have already 

 been given in Chapter VIII. 



Scudder's "Every-day Butterflies," 

 Mary Dickerson's "Moths and Butter- 

 flies," and Eliot and Soule's "Cater- 

 pillars and their Moths, " are admirable 

 books. Reference to them will give 

 suggestions for an unlimited amount of 

 Young (nymph) of observation. Scudder's "Life of a 



FIG. 71. 



a Mayfly, showing (g) Butterfly is a detailed account of the 



^^ butterfly . Comstock's "How 



. ., ,, 



to Know the Butterflies ' and Holland s 

 "The Butterfly Book," are finely illus- 

 trated manuals of butterfly classification. 



tracheal gills (Three 

 times natural size; alter 

 Jenkins and Kellogg.) 



Scorpions, spiders, mites, and ticks (class Arachnida). 



The class Arachnida is composed of Arthropods whose body- 

 segments are grouped into two regions, a cephalothorax bear- 

 ing the mouth-parts, eyes, and legs, and an abdomen. The 



