SPKINGTAILS. 13 



Many of the species are clothed with scales very similar in 

 appearance to the scales on the wings of butterflies. 



Their name of Springbail is derived from the fact that many of 

 them possess the power of leaping by means of an appendage lying 

 beneath the body. The lower figure in the illustration (fig. 8) shows 



Fig. 9. 



Gampodea staphylimis, enlarged seven times. 



this forked appendage. Some of the genera do not possess this 

 power. 



The Thysanura are divided into four families : Oampodeicke, 

 Japygidcz, Machilidce, and Lepismidce, insects wbich differ greatly in 

 appearance and structure. 



The first includes what is perhaps the most primitive of all insects 

 Campodea, a small, nearly white, very active creature, about a quarter 

 of an inch in length, common in garden mould, under dead leaves, etc. 



