INSECTA 



111 



eggs in the bodies of their hosts and the larvae live as in- 

 ternal parasites. The flesh-flies or blow-flies (Sarcopha- 

 gidce) are commonly found about decaying meat. The 

 maggots burrowing through their food; the adults eat and 

 lay eggs on the outside. The larvae are sometimes found 

 in living animals, including man. The flower-flies (Syr- 



SOURCE 

 Nasal discharged 



Open 



DISEASE HOtV ENTERS MAN 

 infantile para/ysis - Nose 



optha/mia 

 syphi/Ls 



ttttAnue 



fabercu/osis 

 typfyo/d 



diarrhoea 

 C/io/era 



tapeworm 



Open sore 



Food 



SWAT THE 



FLY 



/zo eggs 



93J/ZO00000 

 JS987Z0000000 eggs 



MAY /0. 60 /-//es/oy 



WAfZO- 3600 f/ies lay. 



MAYJO^ZIBOOO F/ies lay 



</<W /O. ]Z 160000 /-//es /ay 



JVME. ZO- 77000000 fUes fay 

 'JUNE 3O-J0466560000O Hies /ay 

 = JULY 9-Z79fJ60000000r/,es fay 



JULY ll-/67<?6/60000000oFlies lay 20/ SSJ KOOOOOOOOO 



JULY ZQ-/0077 6^6000000000 Flies lay /X.09 <3J JZO0O00000O0 $05 



AUGUST Q- 60J66/760O0000OOOO flies lag *r&Jj<?4/l2OO00O0O0000 <?993 



Fia. 54. Showing the relations of flies to disease and a cartoon from a current 



newspaper. 



phidce) frequently are abundant in the United States. 

 They fly about on bright days and rest at other times in 

 flowers or among leaves. Their food varies greatly in the 

 larval state, but as adults most species subsist on pollen 

 and nectar. 



The house-flies (Muscidce, Fig. 54) are probably of more 



