INSECTS. 



149 



Fig. 140), representing an insect which frequents stony places, 

 and is allied, in its structure, to that found in sugar (Lepisma). 

 The name Podura, meaning literally a "leg in the tail," was 

 bestowed by Linnaws on those which have the tail forked 



. 141. POUL-K.V (MAGNIFIED). 





Fig. 140. 

 MACHILIS (MAGNIFIED). 



Fig. 142. THE COMMON LOUSK 

 (MAGNIFIED), WITH THE EGGS 



THE NATURAL SIZE AND MAG- 

 NIFIED. 



(Fig. 141). It is kept bent underneath the body when not 

 in use ; when unbent it acts as a spring, and has given origin 

 to their English name of Spring-tails."* Some species 

 abound on pools, leaping even on the surface of the water; 

 others may be found under stones or beneath decaying leaves. 

 III. PARASITA. The Louse (Fig. 142) and its allies 

 insects parasitic on man and the lower animals form the 

 numerous but unpopular genera comprised in the present order. 



* A Paper, by Robert Templeton, Esq. on the Irish species of sprir.- 

 tailed insects, is published in the Transactions of the Entomological 

 Society, vol. i. 



