186 OTHER MEi\IBER« UF THE CLASS — IK. SECTA 



Through this tube, they take in 

 the air. Tlie}' hve in this manner 

 for about a weelv an^l then change 

 to i.)U|);e (Fig. 129). The pupic 

 are also active, and they have the 

 anterior end of tlieir bodies greatly 

 enlarged. The}' eat nothing, and 

 in a few days their skins split open 

 on the back, and the adult mos- 

 quitoes (Fig. loO) come forth. 



In general, the mouth jjarts of 

 flies are foi'med for sucking like 

 those of the mosquitoes. Familiar 

 meml)ers of this group are the 

 horsefly (Fig. 131), the blowfly, 

 house fly, gnats, midges, etc. 



Flies })ass thi-oug!i a comiilete 

 metamoi'pliosis in tlieir life his- 

 tory. Tlie 



Fio. 12S. — Wi};;; 

 mon mosquilo, enlargeil; r, 

 breathing tube. 



egg ]iro- 

 d u c e s a, 

 lai'va, usu- 

 ally whit- 

 ish in color, without feet. It is called 

 a maggot. AA'lien if. changes (o a 

 pupa, it seldom makes a cocoon; 

 but many transform witliin tlie last 

 larval skin which si'r\'es as a cocuon. 

 Beetles. — This is tlie largest grouj) 

 of insects and foi'nis the oi'der, 

 Ciileiiplerfi (sheatli winge(l). Tlir 

 hri'lle.^ j)0.s.^css OIK' jiinr 'if Ihiii. iiicin- 



I'u;. 12!1. — I'lipa of com- 

 mon nios(iuito, niiu-li 

 .■ularKecl. 



