200 



INDEX. 



Dragon flies (Odonata), 42, 73, 

 113, 131, 142 ; as mosquito 

 hawks, 12, 131-133; breeding 

 grounds and habits, 42-51, 80, 

 81, 115-117, 144; description 

 of eggs, 126 ; devouring fish, 

 115 ; duration of stages, 48, 75 ; 

 eggs of, 44, 45 ; experiments 

 in rearing, 75, 81 ; food of, 144 ; 

 incapable of domestication, 

 87; larvae, cannibalism, 47, 63, 

 116, 118; lai'vfe, enemies of, 

 47 ; larvae, food of, 47—10 ; lar- 

 vae, locomotion, 46; larvaj, 

 structure of mouth, 46; life 

 history and structure, 42, 73, 

 113; migration of, 49, 114; 

 mutual depredation of, 47, 63, 

 116-118 ; natural condition 

 under which they breed, 73; 

 number of eggs, 125 ; oviposi- 

 tion of, 79, 125 ; pairing of, 45, 

 75 ; parasites of, 44, 50 ; table 

 of time, appearance, locality, 

 etc., 74; ti'ansformations, 48, 

 75. 



Drainage, 61, 93, 122. 



Eggs of dragon flies, 44, 45, 125- 

 127; of mosquitoes, 29, 84, 

 107. 



Enemies of dragon fly larvae, 47, 

 50. 



Entomophthorae (fungoid growth 

 on insects), 58, 124. 



.Entozoa, 110. 



Ephemeridae (May flies), 76. 



Experiments in rearing dragon 

 flies, 75-81 ; flies, 83 ; mosqui- 

 toes, 29, 84. 



Fevers, dissemination of, 54-56, 

 93, 109, 110. 



Filaria (tape worm), 52-54, 110. 



Filaria muscae, 124. 



Filaria sanguinis hominis, 52, 

 110. 



Fish, devoured liy di-agon fly 

 larvae, 115 ; stocking ponds 

 with, 117, 119, 122. 



Flies, and mosquitoes, relation to 

 eacli other, 85 ; destruction of, 

 123 ; habits and structure, 37, 

 81 ; larval and pupal stages, 

 41, 86; natural condition un- 

 der which they breed, 81 ; 

 plague of, 39; as scavengers, 

 41, 85 ; spreading disease, 54. 



Fungoid growths, 58. 



Fungus, dissemination of, 119, 

 120. 



Geometridae, 89. 

 Gomphus, 13, 44, 116. 



Habits of centipedes, 91. 

 Haematobia serrata (horn fly), 54- 

 Haematozoae, 52. 

 Hammer headed dragon flies, 43. 

 Hostile environment, 138. 

 House flies (Muscidge), 37, 38, 83- 



85, 123; destruction of, 123. 

 Hymenoptera, 90. 

 Hyperchiria io, 89. 

 Hypoderma larvae, 55. 



Ichneumonidae, 90. 

 Indefinite multiplication of drag- 

 on flies, 87. 

 Insecticides, 57, 58, 65, 120. 

 Insects, injurious, number of, 25. 

 Inoculation by bacilli, 56. 



