16 THE CANADIAN ENTOMOLOGIST. 
paddle and forcing the canoe in order to secure this curious are 
imagine my disappointment, just as I was within a yard of it, to see it 
swallowed by a trout. The day was fine, with just sufficient wind to waft 
a delicate body of this nature across the lake. My curiosity being aroused, 
I kept a good look out for another specimen, but no more were seen that 
day. 
On another lake further north, and during similar weather, I was 
pleased to witness a number of these in their aeronautic excursions, and 
on a rock in the centre of the lake was fortunate in capturing a specimen 
of the spider. In size it is as large as the house spider. The body and 
legs are densely covered with stiff hair; its mandibles are long and sharp. 
It was extremely active, and lived about three weeks in a box after its 
capture. I am at a loss to account for the mode in which this spider pro- 
duces the structure with the extraordinary length of attached thread, 
which it manages to send off in the air. The woods near the lakes are 
principally pines, which are moss-covered and rugged, and yet, these 
curious balloons are evidently constructed on trees on the margin of the 
lakes. 
ON THE GEOGRAPHICAL DISTRIBUTION OF SOME GENERA 
OF CANADIAN INSECTS. 
BY FRANCIS WALKER, LONDON, ENGLAND. 
The following communication includes two genera of Chalidie, 
Perilampus, and Callimome.  Perilampus is known in America from 
Canada to Mexico. P. hyalinus Say, inhabits Canada; P. cyaneus Brulle, 
and P. Entellus Walk. are synonyms of it. Say has described two 
other species, P. platigaster and P. ériangularis; the latter is distinguished 
from all other species by the dark tips of the wings. 2. Alexinus Walk. 
differs from P. platigaster by not having a brassy tinge, by the luteous 
tips of the femora, and by the luteous tibia with a black band. The 
specimen of P. Zepreos is too much mutilated to ascertain if it agrees 
with P. platigaster. P. hyalinus, above mentioned, has some resemblance 
to the European P. violaceus, but has an elongated scutellum; in this 
character it is far exceeded by the Mexican P. gloriosus, which far sur- 
passes all other known species in size and beauty. JP. gloriosus is also 
peculiar in the developement of the secondary veins of the forewings 
