THE CANADIAN ENTOMOLOGIST. 19 
Not far from one end the mine was widened a little and the cuticle 
puckered, forming a small nidus like that of a Phdlocnistis pupa. Within 
this nidus a small larva was visible. It was white, with the head pointed 
before, but widened behind, and with the thoracic segments much swollen 
and tapering rapidly from thence to the tail. (There is a good deal of 
resemblance betweenthe very young larvae of Gracillaria, Philocnistis and 
Lithocolletis of the cylindrical group.) In a day or two it changed its 
form, becoming cylindrical and pale yellowish white, and it left the mine 
and went to the der side of the leaf, where it turned down the edge over 
it, and, after eating out the parenchyma, turned it down in another place, 
repeating this operation two or three times until it finally became a pupa 
under the edge last turned down. Sometimes (at least in the breeding 
jar) it leaves the leaf and pupates under a sheet or coverlet of white silk 
like G. salicifoliella and many other species. Which mode it follows in a 
state of nature I am unable to say, having never found it in the pupa 
state. G. juglandiella mihi mines the under surface of the leaves, 
but the mine is larger and more blotch like, and when it leaves the mine 
it goes to the wpper side of the leaf which it curls upwards over itself and 
there passes the pupa state. I do not mean to say that this habit of going 
to the side of the leaf opposite the mine is universal in either species, but 
only so far as I have observed it in some ten specimens of each. G. 
blandella is a very handsome species. 
A BALLOON SPIDER. 
BY WILLIAM COUPER, MONTREAL. 
“The American Naturalist” for May, 1871, contains an interesting 
article on “ Flying Spiders,” by J. H. Emerton. The species noticed by 
him are, no doubt, allied to the gossamer of Europe, and the phenomenon 
occurs early in autumn on the Islands of the St. Lawrence. 
During the month of July, 1871, while trout-fishing on a large lake 
. near the Upper Assumption, about one hundred miles north of Montreal, 
my attention was drawn to an inflated transparent substance of 
an oblong cocoon shape, passing about fifty yards over my head. To this 
miniature balloon, a thread was attached, and, on tracing it downward, its 
architect was seen struggling on the surface of the lake. Taking up the 
