84 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



Bur oak 50 



Butternut 68 



Cankerworm, spring . . 21, 22, 23 



Carolina poplar 59 



Carpenterworm 48, 59 



Catalpa 14,15 



sphinx 14, 15 



Caterpillar 7G 



eastern tent 12, 13 



walnut 67,67 



yellow-necked . . . .16, 17, 38 



Ceratomia catalpae 14 



Chermes 



abietis 64 



cooleyi 20, 64 



Cherry, black 12 



Chinese elm 24 



Chinquapin 50 



Chionaspis 



corni 20 



furfura 26 



Chokecherry 12 



Choristoneura fumiferana . . 65 

 Chrysobothris femorata ... 46 



Chrysomela scripta 60 



Cicada 77 



periodical 48, 49 



Citheronia regalis 37 



Clavigerus smithiae 68 



Cockscomb gall 



aphid, elm 29 



elm . . . 30 



Colopha ulmicola 29 



Colorado blue spruce .... 64 



Comstock mealybug 16 



Conotrachelus retentus ... 68 

 Cooley spruce gall aphid 20, 21, 64 



Corn silk 75 



Corythucha ciliata 65 



Cottonwood 59, 60 



borer 59 



leaf beetle 60 



Cottony maple scale . . . 43, 44 



Crab 16,36 



Curculio, black walnut ... 68 



Cynipidae 53 



Cynthia moth 5 



Datana 



integerrima . . . 



minis tr a 



Dendrothrips ornatus 

 Devil, hickory horned 

 Diaspis carueli . . . 

 Dichoweris marginella 

 Dioryctria zimmermani 



67 

 16 

 60 

 37 

 37 

 38 

 58 



Dogwood 20 



borer 20 



scale 20 



Douglas fir .... . 20,21,64 

 Drepanaphis acerifoliae ... 47 

 Dutch elm disease .... 31, 32 

 Dysmicoccus cuspidatae ... 73 



Eastern 



spruce gall aphid 64 



tent caterpillar 12, 13 



Elaphidion villosum 48 



Elm . . 14,21,22,26,27,28,32,48,75 



American 21,23,33 



aphid, woolly 29 



bark beetle 



smaller European . . . 31, 32 



native 31 



borer 29,31 



Chinese 24 



cockscomb gall 30 



aphid 29 



disease, Dutch 31,32 



leaf 



aphid 28,29 



beetle 24,25 



leafhopper, banded .... 33 

 scale, European .... 25, 26 



spanworm 40 



Engelmann spruce 64 



Ennomos subsignarius .... 40 

 Eotetranychus multidigitidi . . 43 

 Eriosoma 



americanum 29 



crataegi 1G 



Erythroneura bistrata .... 61 



Euonymus 33, 34 



scale 33,34 



European 

 elm 



bark beetle, smaller . . 31, 32 



scale 25, 26 



pine shoot moth 57 



red mite 18 



F 



Fall webworm 9, 10, 24 



Flatheaded apple tree borer 46, 46, 48 



Fletcher scale 71, 71 



Fir, Douglas 20, 21, 64 



G 



Galerucella luteola 24 



Gall 53 



aphid 



Cooley spruce ... 20, 21, 64 

 eastern spruce 64 



