. , 1876.] Proceedings of Societies. 635 
others revolute foldings, and still others are concave and imbricated. 
But the venation does not seem to furnish characters distinguishing be- 
tween the two principal sections, the white and black oaks. 
June 5th. Dr. George Engelmann read a communication on certain 
fungi of the grape and oak. 
Professor Riley exhibited specimens of ‘the periodical Cicada, in the 
pupa and perfect states, recently received from Mr. Charles McCorkle, 
of Lexington, Va. Eight years ago Professor Riley had shown that 
there were thirteen as well as seventeen year races of. this periodical 
Cicada, and in a chronological history of the species he had at that time 
predicted that “in the year 1876, and at intervals of seventeen years 
thereafter, they will in all probability appear from Raleigh, North Car- 
olina, to near Petersburg, Virginia ; in Rowan, Davie, Cabarras, and 
Iredell counties in North Carolina; in the valley of Virginia as far as the 
Blue Ridge on the east, the Potomac River on the north, the Tennessee 
and North Carolina lines on the south, and for several counties west; in 
the south part of St. Mary’s County, Maryland, dividing the county 
about midway east and west ; in Illinois about Alton; and in Sullivan 
and Knox counties, Indiana.” 
The specimens from Mr. McCorkle were proof of the correctness of 
the prediction in regard to Virginia. While this insect requires thirteen or 
seventeen years, according to the race, for its underground development, 
the actual development has never been watched from the egg to the mature 
Sr In 1868 he had collected together in a particular spot near this 
Y a large number of the hatching eggs of a thirteen-year brood which 
will appear here again in 1881, and he had been able to obtain and note 
the development of the larve every year since. They are now about 
berry silk-worm (Sericaria mori) reared on Osage orange. The worms 
reared them for five years on Osage orange wit 
My'or quality of silk, and great increase of vigor and healthfulness. 
re is no reason why our ladies might not be dressed with silk from 
our own native hedges. 
_ June 19th. Professor Riley exhibited specimens of a worm that was 
Jst at this time devastating the wheat fields of parts of Kansas, and 
Particularly of Dickinson County. It does not eat the blades but attacks 
the h ; ined the species to be Leucania 
allied to the common army 
As it 
