26 
Beech ( Fagus ferruginea , Ait.), Maple {Acer saccharinum, Wang.), Oak 
( Quercus , several species), Honey Locust (Gleditschia triacanthos, L.), 
Black Gum (Wyssa multiflora, Wang.), Thorn (Crataegus, several species), 
Wild Crab-apple ( Pyrus coronaria , L.), Elm (TJlmus fulva , Michx. and 
U. americana , L.), Osage Orange ( Madura ciurantiaca, Nutt.), Sycamore 
( PJatanus occidental is, L.), and among orchard trees, Apple, Quince, and 
Peach, were trees upon which the females deposited their eggs in great- 
est numbers, but, from the fact that all of these trees are not present in 
equal numbers, they could on^ be occupied in proportion to their 
abundance. Cicadas were also found laying upon the Tulip Tree (Lirio- 
dendron tulipifera, L.), Black Locust (Robinia pseud acacia, L.), Sweet- 
brier ( Rosa rubiginosa , L.), Red Bud ( Cercis canadensis , L.), Grape 
(Vitus cordifolia , Michx.), Poison Ivy (Rhus toxicodendron , L.), Catalpa 
(Catalpabignonioides, Walt.), and upon the domesticated species of Plum, 
Pear, Gooseberry, and Curraut. I have found them very rarely oviposit- 
ing on Hickory ( Garya , several species), Ash ( Fraxinus americana , L.), 
Linden ( Tilia americana , L.), Walnut (Juglans nigra , L.), and Butternut 
(J. cinerea , L.). No eggs were found upon the Wild Cherry (Prunus 
serotina , Ehr.), or upon the cultivated Cherry. 
Twenty-three days after the appearance of the Cicadas a perceptible 
decrease in numbers was observed. Up to this time the males had 
greatly outnumbered the females, but the decrease in numbers appears 
to come from the disappearance of the former, which, being the first to 
appear, are also the first to leave us. Nine days later but few examples 
could be found, and these were mostly females. Thirty-nine days after 
appearing but an occasional Cicada could be found, and their season 
may be said to be ended. These observations were made in localities 
where they first appeared, but observations iu other places sustain the 
chronology I have given. At a point 5 miles east of Brookville, on July 
15, nine days after they had disappeared from the river valleys, I found 
Cicadas abundant and very active, indicating that they had not yet 
reached the wane of their maturity. 
The typical species, Cicada septendecim , L., and the smaller form, cas- 
sinii , Fisher, were both found here, but the latter was much the more 
common. Each form frequents a different locality. 
I have never seen a place where the territory of the two kinds could 
be said to overlap. True it is that an occasional representative of one 
form may be found within the range of the other, but such cases are 
rare, and when they do occur are easily distinguished. 
There are three different sounds produced by the Cicada. The note 
of surprise is one which never fails to startle the intruder; it is a shrill 
screech of varying length. When several insects utter this noise at the 
same time it is almost deafening to one who is close at hand. Another 
sound is the peculiar rattling noise made by the insect when flying. 
This utterance is very monotonous, without inflection, and prolonged 
to various lengths according to the distance of flight. The sounds just 
