16 



THE LARVA. 



rent as a piece of crystal, and is sciarcely distinguisliable 

 from the water in wliich it lives. • 



Larva of Water-Beetle [Dytiscus). 



2. Parts. — The anatomy of the larva might be arranged 

 as in this tabular view : 



Eyes. 



Simple Eyes. 



^ Compound Eyes, 

 I ATit«>Tiii«^ I llesembling those of the perfect insect. 

 I -^iitenuai. j ^^^^^ resembiinq- those of the perfect insect. 



> 



< 



O 



fUpper lip (Labrum). 

 I Under lip (] 



^^^^•\ I Under lip (Labium). 



I ivrmifh J Upper.iawslMandibulsel. 

 iuoutn. s Under jaws (Maxillgei. 



I 



rings. 



Horny and composed 

 joints — or true legs. 



of 



f Segments or 



Coxa, trochan- 

 ter, femur, ti- 

 I I j^.^,o-w. .,c.. x.go. ^ bia, tarsus. 



Trunk and Abdo-! Legs. <J f With terminal 



••^<^" "> j Fleshy and -without joints I claws. 



i^ —or prolegs. 1 Without termi- 



No larviv have vjings. \_ nal claws. 



Spiracles. 

 Various extraneous appendages. 



The liead of the larva is rarely separated from the body 

 by a distinct neck; yet it may be readily distinguished, 

 as in most cases it is covered with a horny substance, or at 

 least with a shin somewhat harder than that of the other 

 portions. 



The larvse of many of the dipterous insects, however, 



