202 Bulletin Wisconsin Natural History Society [Vol. 13, No. 4 
Stratiomyia normula Loew. One of these flies was seen in July and one 
in August on the leaves of Spiraea salicifolia, the meadow sweet. 
Syritta pipiens Loew. Several were seen in July; only one was seen in 
August. 
Phorbia fusciceps Zett. A brightly colored fly often seen in August 
flying about the meadow sweet. 
Leucomelina garrula Geig. Found in small numbers during August. 
Tipula abdominalis Howard. Only one of these crane flies was observed. 
It flies very slowly, and only for a short distance at a time. 
Tetragnatha straminea Comstock. Frequently seen in the early morn- 
ing flying from leaf to leaf of the different water plants. 
Hemiptera 
Ceresa bubalis Fabr. Two of this species were seen in August. 
Diedrocephala sp? Fabr. This small fly, which was preyed upon by 
the damsel-flies, but not easily captured by them, was very common among 
the reeds throughout July and August. 
Ranatra fusca Comstock. Only one individual of this species was seen. 
It was captured while crawling along a submerged reed. 
Limnobates lineata Comstock. These insects were found on water plan- 
tain early in July. As the bog became drier they migrated out into the 
lake, so that none were found on the plot after the first week in July. 
Ephemerida 
Hexagenia limbata Pictet. Very few of these May flies were observed. 
They were the prey of several species of dragon flies. 
Odonata 
Anax junius Drury. This — the largest dragon fly seen on the bog — was 
observed during the months of July and August, although their numbers 
' became greatly diminished in August. 
Aeschna verticalis Hagen. Very rare all over the bog. Not more than 
five or six were seen throughout the months of July and August. 
Aeschna constricta Hagen. More plentiful than Aeschna verticalis , 
but still not very numerous. 
Libellula pulchella Drury. This species — the most numerous of all the 
dragon flies — was found throughout July and August. The females poise 
themselves close to the water, remain almost motionless for a few seconds, 
and then quickly strike the water with the tip of the abdomen as they lay 
their eggs. The males and females resemble each other very closely in 
size, shape, and coloring. 
Amphiagrion saucium Burmeister. These insects were seen in great 
numbers in August. Comparatively rare during July. 
Sympetrum rubicundulum Say. These dragon flies are easily distin- 
guished from those of other species by the yellow or reddish yellow tone 
of their bodies. 
