Chinch-bug, outbreak of 1910 to 

 1915 : — Continued. 

 causes of, 84-94, 129. 

 crop relation to, 84, 86-91. 

 effect of egg-parasite on arrest 

 of, 96-97. 

 of predaceous insects on arrest 



of, 96. 

 of weather on arrest of, 94-95, 

 120. 

 effects of kinds and distribution 



of crops on, 87-91. 

 expansion of, 76-84. 

 estimated damage to Illinois 



crops during, 75, 120. 

 falling off in numbers of beef and 

 dairy cattle as consequence of, 

 75-76, 120. 

 general conclusion from discus- 

 sion of, 93. 

 object of present paper on, 72. 

 reasons for northern extension of, 



91, 120. 

 weather relation to, 84, 85-86. 

 requisites to successful control of, 



98. 

 results of persistent and coopera- 

 tive fights against, 71-72, 116- 

 117. 

 summary of present article on, 120- 

 122. 

 Codling-moth, discussion of diagram 

 and of other data illustrating ef- 

 fect of temperature on life his- 

 tory of, etc., 5-10. 

 eggs, 2, 4, 5, 6, 7, 8, 9, 10, 12. 

 main object of field work on, 2. 

 number of generations of, 2, 10. 

 on the life history of the, 1-21. 

 outline of experiments on, 4-5. 

 spraying for, in 1914, 1. 

 stations for field observation and 

 experiment on, 1—2, 3. 

 equipment of, 3, 4, 13. 

 tabular exhibit of seasonal history 



of, 6. 

 when to spray for, 3, 6, 10-13. 

 Coffee-tree, Kentucky, May-beetles 



collected from, 58. 

 congrua, Phyllophaga, 41. 

 Corn as food plant of May-beetles, 

 33, 58, 60. 

 cases in which tobacco sprays may 

 profitably be used to protect, 107. 

 estimated injury to, by chinch -bug 



in 1914, 71. 

 -field grasses, Eumicrosoma benefica 

 hibernating among, 96. 



corrosa, Phyllophaga, 40, 44, 64. 

 Cottonwood, or poplar, as food plant 

 of May-beetles, 59. See also Poplar. 

 crassissima, Phyllophaga, 41. 

 crenulata, Phyllophaga. 39, 44, 45, 64. 

 Currant, May-beetles collected from, 



58. 

 Flowering, May-beetles collected 



from, 58. 

 Cyclocephala grubs, 66. 



delata, Phyllophaga, 41, 44, 64. 

 drakii, Phyllophaga, 40, 44, 46, 63. 

 Dogwood, May-beetles collected from, 



58. 

 dubia, Phyllophaga, 35, 47. 



E 



Elm as food plant of May-beetles, 29, 

 30, 32, 33, 34, 35, 36, 38, 40, 42, 

 43, 46, 58, 59, 60, 61, 63. 



Engerling, 57. 



ephilida, Phyllophaga, 34, 47. 



Eumicrosoma benefica as parasite of 

 egg of Chinch-bug, 96-97. 



F 



fervida, Phyllophaga, 38, 44, 46, 63. 

 Forage plants, May-beetles collected 



from, 60. 

 forbesi, Phyllophaga, 34, 44, 46, 63, 



64. 

 Formica fusca subsericea as enemy of 



Chinch-bug, 96. 

 forsteri, Phyllophaga, 41, 44, 45, 64. 

 fraterna, Phyllophaga, 36, 38, 45, 63, 



64. 

 Fungi, parasitic on May-beetles and 



white-grubs, 57, 65. 

 fusca, Phyllophaga, 31, 33, 34, 36, 44, 

 46, 61, 63, 65. 



subsericea, Formica, 96. 

 futilis, Phyllophaga, 31, 32, 33, 38, 



61, 63, 65. 



gibbosa, Phyllophaga, 47. 



Gooseberry as food plant of May-bee- 

 tles, 29, 32, 33, 38, 40, 43, 58, 60, 

 63. 



grandis, Phyllophaga, 40, 47. 



Grape as food plant of May-beetles, 

 40, 58. 



