[ ^5 ] 
X. Some Obfervations on the Cicada of 
North America, Colle&ed by Mr. P. Col' 
linfon, F. R. S. 
London Nov. 2, 1763. 
Read Feb. 23, y Pennfyl vania the Cicada is leen annu- 
J/ ! ' ally, but not in fuch numbers as to be 
remarkable j but at certain periods, of 1401- 15 years 
diftance, they come forth in fuch great fwarms, that 
the people have given them the name of Locujis . 
About the latter end of April thefe Cicadas come 
near the fuiface : this is known, by the hogs rout- 
ing after them. They creep out of the ground, near 
the roots of trees, in fuch numbers, that in fome 
places, the earth is fo full of holes, it is like an 
honey-comb. 
Their firft appearance is an hexapode (an ill-fha- 
pen grub) with fix feet. This is their middle or nymph 
flate : they creep up every thing near them, and fix 
their claws faft, on the fhrubs, and bark of trees : 
then the fkin on its back burfts open, and the fly 
comes forth, difengaging itfelf by degrees, leaving 
the cafe or exuviae behind, in the exaCt fhape, in 
which it was before occupied. 
At firft coming out, the Cicadae are all white, 
with red eyes, and feem weak, and tender; but 
next day they attain to their full flrength and per- 
fection, being of a dark brown colour,- with four 
finely- veined tranfparent wings, as will be better feen, 
than defcribed, by the fpecimens before you. [Tab. 
VIII.] 
Vol. LIV. K They 
