1915] Andrews: Survey of Lake Butte Des Morts Boa 
209 
insects are oblivious to external conditions while they sleep is 
shown by the fact that a white net can be swayed back and forth 
a few inches from their eyes and they appear totally unconscious 
of it. No response is elicited when the wings are lightly stroked. 
Sympetrum rubicundulum could be picked up in the fingers before 
awakening, and then — after being released — would fly only a few 
feet and there take up a station again on another reed. 
The swamp milk-weed, Asclepias incarnata, attracted a number 
of the smaller insects — the red beetle, Tetraopes tetraophthalmus, 
resting singly or in pairs on the leaves of this plant. The life of 
this beetle is intimately connected with the milk-weed. The 
roots and lower parts of the stem furnish nutrition for the larva 
which burrows into it; the flowers give food to the adult. Be- 
sides Tetraopes, the flowers attract many other insects as bees, 
wasps, flies, butterflies, moths, beetles, and occasionally bugs. 
Some of these are guided by the bright coloring; some, perhaps, 
are led to the nectar by the odor. Many pause only to rest as 
they fly about from plant to plant. 
Iris versicolor also attracts many small insects. The little syr- 
phus flies are often seen on the blossoms, moving their abdomens 
up and down as they feed— a habit which gives them a remarkable 
resemblance to bees. When resting, these little flies remain 
quietly on a flower or stalk with their wings folded together over 
their back. Tabanid flies also hover about this plant probably in 
search of a suitable place to lay their eggs. The larva of the vice- 
roy feeds in great numbers on the iris stems, although it feeds 
also on several other bog plants — as Sagittaria and Alisma planta - 
go-aquatica. 
The monarch caterpillar seems to prefer the milkweed where 
several were taken. All spun their cocoons, but only one came 
out. The others have been parasitized by some hymenopteron. 
A dozen of the larva of Junonia coenia were taken, and all but 
one developed into adult butterflies. 
The grasshoppers and crickets fed on algae and other small 
plants. The grasses and the meadow sweet, Spiraea salicifolia, 
furnished food for some of the snails. 
During the first of July three species of snails were present on 
the small section of bog, but later in the month — as the water 
receded — Lymnaea and Planorbis migrated further out. Succinea 
