INSECTS AND DISEASE 233 



SUMMARY 



Reason for study of diptera. 

 Characteristics of diptera. 



One pair of wings, balancers, complete metamorphosis. 

 Mouth parts for rasping and sucking (fly). 

 Mouth parts for piercing and sucking (mosquito). 

 Fly. 



Mouth parts for rasping and sucking, large eyes. 



Thick fleshy antennae, powerful wings, sticky feet, hairy. 



Life History. 



Egg, laid in manure or filth, 200, hatch in one day. 



Larva, maggot, scavengers, period: 5-6 days. 



Pupa, passed in last larva skin, period: 7 days. 



Adult, develop in two weeks all summer (compute numbers). 

 Harm done by flies. 



Annoyance to people and animals. 



Transfer filth to food. 



Transfer germs externally and internally. 



Typhoid, cholera, dysentery, tuberculosis, sleeping sickness. 

 Methods of control or prevention. 



Cover manure Remove garbage Use screens 



Cover foods Use traps " Swat 'em " 



Mosquito. 

 Structure. 



Mouth parts for piercing and sucking, saliva injected. 



Mandibles, maxillae, labrum, and tongue inside labium. 

 Relation to disease. 



Malaria and yellow fever. How proven. 



How transmitted. 

 Life History. 



Egg, in rafts on the water. 



Larva, wigglers, breathe head downwards. 



Pupa, also active, breathe head upwards. 



Adult, female bites animals, male harmless. 

 Control and prevention. 



Drainage of swamps. Spraying with oil. 



Fish and dragon flies. Screening houses. 



Protecting those who are sick. 

 Kinds. 



Culex, common northern mosquito, body horizontal. 



Anopheles, malaria, body almost vertical. 



Stegomyia, yellow fever, tropical. 



