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PRELIMINARY NOTES ON THE ODONATA. 
Genus Argia Rambur. 
A. moesta putrida (Hagen). Wilson took this species along the 
Mississippi between St. Paul and Hastings, July 12, at Red Wing, 
July 17, and at Winona, July 19, 1907, including both sexes. It was 
usually seen in company with others of the same genus. The writer 
has collected all four species together sunning themselves upon the 
rocks and sandy banks of the Iowa River. At the approach of the net 
they seem to dissolve in the sunshine, so rapid are their motions, and at 
its retreat to again precipitate from the atmosphere upon the gray face 
of the rock. 
A. violacea Hagen. Recorded from Lake Okoboji, Dickinson 
County, lowa, and from Wisconsin. 
A. tibialis Rambur. Wilson’s records are the only ones for this 
form thus far. Stillwater, July 15, 1907: “Both sexes flying about in 
open sunshine in company with L. quadrimaculata and Leucorhinia in- 
tacta.” Red Wing, July 17, 1907: “Both sexes common along the 
river bank.” Found also in northern Iowa. 
A. apicalis Say. This is the only species of Argia that has come 
under the writer's net within our boundaries. Numerous specimens 
are at hand dated as follows: August 1, 1912, July 20, 1913, and 
August 14, 1914. Wilson took the species at Hastings, Stillwater and 
Red Wing, July 12-17, 1907. It is the commonest Argia of Minne- 
sota and Iowa. 
Genus Nehalennia Selys. 
N. wene Hagen. Taken very frequently during June and July, 
1913, at Mankato. Also at Beaver Lake, St. Paul, on July 10, 1910 
(Wilson). It is usually found in the tall grasses about marshy places 
and kettle-holes, never venturing into the higher air but keeping close 
to the water along the shore line or fluttering unseen between the 
stems of the sedges. Common in surrounding: states. 
Genus Amphiagrion Selys. 
A. saucium Burm. After two seasons collecting in Blue Earth 
County without seeing this species, the writer discovered it in small 
numbers and in teneral condition along a very small stream leading 
from the “slough” to the Minnesota River at Mankato, on June 11, 
1913. A few days after, thousands of fully colored individuals were 
copulating and ovipositing in the shallow water among the sedges and 
Sagittarias. A week later their numbers began to reduce and by July 
7 but an occasional specimen could be found. During the whole period 
