CONTENTS. 



INTRODUCTION. 

 By Robert H. Lamborn, Ph. D. 



THE DIPTEROUS ENEMIES OF ]MAN. 

 By Mrs. C. B. Aaron. 



Importance of Economic Entomology. — Efforts to master the 

 insect world — Magnitude of the work — Arrangement of dis- 

 cussion .... 25-27 



Life History and Structure op the Mosquito. — Breeding 

 jilaces — Female instinct — Descripti( m of oviiaosition — Habits 

 of young mosquito— External breathing apparatus — Trans- 

 formations — Period of emergence — Females as tormentors — 

 Experiments of Drs. Bonavia and Dimmock — Effect of the 

 bite a source of conflicting testimony — Westwood's opinion 

 also Packard's — Poison glands analyzed by Dr. Dimmock 

 and Prof. Macloskie — Hibernation — Migration — Explana- 

 tion of the prevalence of mosquitoes at the shore during a 

 land breeze — Mosquitoes as pests in other ways than as 

 biters— Interfering with arts and manufactures — Devouring 

 young trout 28-37 



Life History and Structure op the Fly. — Habitat — Swarms — 

 Plague of flies — House fly incapable of biting — Mouth 

 ])arts — Development — Fly's foot as a means of pi'opagating 

 disease 87-12 



Life History and Structure op the Dragon Fly. — Classi- 

 fication according to haljit — Untiring flight — Oviposition— 

 Varied habits — Protracted development— Power of loco- 

 motion — Remarkable structure of mouth — Food — Fifty 

 thousand young fish devoured by dragon flies — Canni- 

 balism—Length of larval stage — Hours of flight — Vo- 

 racity—Migration — Enemies— Frogs — Fish— Birds .... 42-51 



IMfdical Problem. — Disagreement of scientists — Charges 

 against Culex — Human i>arasitism — Harborers of dis- 

 ease — Manson's discoveries and experiments — Malaria- 

 Ophthalmia carried by flies— Various species parasitic on 

 human skin 5I-5(i 



