ixi)i;x 
rag.'. 
Aootio acid, against periodical Cicada 143 
Amprlis ndrorum, oneiny of periodical (Ucada , 139 
Ants, cncniies of periodical Cicada 130 
Aphis, woolly. {See Schi:oncitra lanifjcrn.) 
Apple, food j)lant of periodical Cicada 102 
injury through oviposition of periodical Cicada 105, lOG, 107 
AstmgaUniis irislis, enemy of periodical Cicada 139 
B:rolophus bicolor, enemy of periodical Cicada 138 
Hass. l)lack. (See Micro ptcru s salmoidcs.) 
BthUa sp., enemy of periodical Cicada 138 
Hircli. black. iooA plant of periodical Cicada 101 
15isul})hid of carbon, against grape root-aphis ■. . . . 145 
periodical Cicada 145-146 
lllackbird. (See Quiscalus quiscula and Q. q. sencus.) 
Dordeaux mixture, repellent against periodical Cicada 144 
Canker-worm, Xothrus ovivorus an enemy 135 
Carl)olic acid, against periodical Cicada 143 
Cardinal grosbeak. (See Cardinalis cardinalis.) 
Cardinalis cardinalis, enemy of periodical Cicada 138 
Catbird. (See Galeoscoptes carolincnsis.) 
Cat 1 )riar. (See Smilax rotundifolia.) 
Catlish, blue. (See Ichthselurus j^unciatus.) 
Catostomus teres, enemy of periodical Cicada 139 
< 'ecidomyiid, enemy of periodical Cicada. ..•..: 129 
Cedar Inrd. (See Ampelis cedrorum.) 
Chalcidids, parasites of periodical Cicada 131 
Cheylctus sp., enemy of periodical Cicada 138 
Chickadee, Carolina. (See Pcnthestcs carolincnsis.) I 
Chipmunk. (See Tamias striatus.) 
Cicada cassinii, a variety of periodical Cicada 20-22 
= Tibicen septcndecim, var. cassinii 22 
dog-day. (See Cicada tibicen.) 
marginata, probably periodic 12 
periodical, ''adobe dwellings." (Sec cones.) 
adull . duration of stage 90-91 
habits .' 99-102 
advantages to species from long larval life 13 
appearance regarded as ominous presage 1 17 
appearances in future 34 
as food for animals 103-104 
man 102-104, 148 
beak 79-81 
175 
