Diabrotica — Continued. 

 Spotted, xxiii, 231. 

 tenella, range of, and injuries by, 



xxiii, 187-188. 

 vittata, xxi. 115, 126 127; xxiii, 188. 

 infested by Sporotrichum globulif- 

 erum, xvii, 81. 

 Diacrisia virginica, xxiii. 72. See also 



under Yellow Bear. 

 dianthi, Rhopalosiphum, xxiii, 210. 

 Diapheromera Eemorata, xxiii, 212. 

 veliei, xxiii, 211. 

 velii, xxiii, 211. 

 diaspidis, Aphelinus, xxi, 44. 

 Diaspis, Peach, xxii, 113, 117. See un- 

 der Peach Diaspis. 

 Diastata sp., Misc. Ess., 92; xxiii, 226. 

 mining leaves of Corn, xxiii, 9, 

 164. 

 Diatra?a saccharalis, YI isc. Ess., 87; 



xxiii, 7, 10, 91-93. 233. 

 Dichelia sulfureana, or sulphureana, xiv, 

 17-20, 21, 74; Misc. Ess., 88; xxiii, 

 174. 

 Dick-cissel, xxiv, 149. 

 Dicraneura fieberi, xxi, 67, 77. 

 Dicranotropis sp. taken on Corn, xxiii, 



204. 

 Dichromorpha viridis, xxiii, 212, 229. 

 Diedrocephala, characterization of, xxi, 

 64. 

 coccinea, xxi, 71. 



mollipes, xxi, 66, 71-72; xxiii, 205. 

 versuta, xxi, 66, 71. 

 differentialis, Melanoplus, xxi, 130, 132; 

 xxiii, 67, 136. 

 Pezotettix, xiv, 23 (See Errata, 136) ; 

 Misc. Ess., 48; xv, 40; xvi, XII; 

 xix, 59. 

 Digger-wasps a- parasites, xxiv, 157,158. 

 dimidiatus, Carpophilus, xxiii, 181. 

 Dingy Cutworm, Misc. Ess., 67; xvi, 88; 



xxiii, 26-28, 232. 

 diospyri, Trioza, xiv, 99. 

 Diptera. injuries to Corn by, xxiii, 9, 

 161-166". 

 larva- and pupae of, found among egg- 

 masses of grasshoppers, Misc. Ess., 

 53, 54. 

 parasitic, Misc. Ess., 5-'; xv, 44; xvii, 

 44; xviii, 47. 124. 125, 151; xix, 76, 

 77: xxi. 101, 107, Kf. 111. 112. 117; 

 xxiii. 22, 47; xxiv. 162, 163. 

 Dipteron as strawberry insect, xiii, 60, 



61. 62. 

 Dipterous larva injuring Celery, Misc. 

 Ess., 128. 

 description of, and of mature 

 . 128. 

 parasite- of Greasj Cutworm, xxiii, 22. 

 of Stalk-borer, xxiii. 47. 



Disease, bacterial, of Chinch-bug, cul- 

 tures of, xvi, 47; xvii, 7b. 77. 

 of Corn, xviii, 52. 

 of Larger Corn Root-worm, xvii, 



71-73. 

 of White-grubs, xvii, 45. 

 in the Chinch-bug, contagious, xix. 

 16-176. See also under 

 Chinch-bug, Sporotrichum 

 globuliferum, Botrytis te- 

 nella, and Isaria leprosa. 

 character of work on, in Il- 

 linois in 1891-94, xix, 25. _ 

 number and nature of experi- 

 ments with, xix, 27. 

 results and economic value of 



work on, xix, 27, 92-96. 

 spontaneous occurrence of, 

 xix, 25, 100. 

 of Apple and Walnut caterpillars, 



xix, 22. 

 of Army-worm, xix, 76; xx, 106-109; 



xxiii, 51. 

 of Bronze Cutworm, xxiii, 30. 

 of cabbage-worms, xiii. 10. 11; xiv, 

 6; Misc. Ess., 6-9, 128; xv. 1; xix, 

 46; xx, 107. 

 of Corn Root-aphis, xviii. 74. 

 of cutworms, xvii, XII; xx, 108. 

 of Drseculaccphala mollipes, xxiii, 



205. 

 of Hedgehog Caterpillar, xxi, 158. 

 Diseases due to Fhvtopti, treatment for, 

 xiv. S3. 86. 

 fungous, xiii, 170; xviii, 126. 



of the San Jose Scale, xx. 22. 

 of Chinch-bug, xvi. 2, 45, 56; xvii, 

 IX. 74_84; xx, 46. 47, 48, 49, 51, 

 52, 53. 

 recent history of, xvii. 75-84. 

 literature on. xvii, 84-87. 

 of European, or Imported, Cabbage- 

 worm, xiii, 10, 11; xiv, 6; Misc. 

 Ess., 6-9, 128; xv, 1. 

 of Forest Tent-caterpillar, xiii. 10; 



xiv, 7. 

 of Honey-bee. xix. 10. 

 of insects, xiii, 10; xix, 18. 

 bacterial, xix, 19. 

 beginnings of knowledge of. and 

 progress of investigation, 

 xix. 19. 

 the subject of, in America, xix, 

 20-25. 

 of Silkworm, xiv, 7: xix, 19. 

 of white ants, xix, 198. 

 of White-grubs, xxiv, 136. 

 disjuncta, Macrophthalma, xxiv. 160. 

 ha, xix, 35. 

 cervicalis, xxi, 1 17. 

 collaris, xxi, 116. 



