PRELIMINARY NOTES ON THE ODONATA. 101 
L. proxima Calvert (Frigida Hagen). Wilson secured both sexes 
of this hitherto eastern species at Lake Phalen, St. Paul, July 8, 1907, 
and other specimens at Beaver Lake, St. Paul, and Hastings on the 
10th and 12th. 
Genus Sympetrum Newman. 
S. rubicundulum Say. Probably common over the State from 
June to September. Seen on every field trip at Mankato during this 
period and was found breeding in very great numbers in the swamps 
about Lake Madison during August. Reed’s Landing, July 18, 1907; 
Wilson. 
This is our commonest and most universally distributed Sympet- 
rum, being seen everywhere from the swamps and streams to the side- 
walks of the cities. 
S. rubicundulum assimilatum Uhler. The data for this sub-species 
is almost identical with that for the above species. It is not quite so 
plentiful, however. 
S. albifrons (Charpentier). ‘Both sexes were captured in the tall 
weeds along the edge of the woods ; they seemed to prefer shady spots.”’ 
Wilson, Reed’s Landing, July 18, 1907. ; 
S. obtrusum Hagen. Mankato, August 18-20, 1914, 3 males and 
1 female. Lake Madison, August 8 and 9, 1914, 2 males. Taken 
about lakes and ponds. 
S. semicinctum Say. Quite common at Mankato from June to 
August. Usually found among the low shrubs and brush at the mar- 
gins of woods near streams or ponds, and most plentiful in August or 
late July. 
S. corruptum Hagen. Mankato, June, 1912, male and female; 
April 27, May 11, June 10, and August 15, 1913, both sexes; April to 
October, 1914, many specimens. Along the roads and railroads and in 
the open woods this large Sympetrum is very common at all seasons but 
is most plentiful perhaps in August and September. It is one of the 
first dragon-flies to appear in the spring, having been repeatedly taken 
or photographed in April. 
Genus Perithemis Hagen. 
P. domitia Drury. The only record of this little species is from 
Lake Madison, August 4-10, 1914. It is, however, of very general 
distribution and may be expected over most or all of the State. It is 
common in nor’iern lowa. On Lake Madison it was present in great 
numbers about the beds of yellow water lilies and Potamogeton in the 
quieter bays, now flitting over and now resting upon the lily pads and 
never far above the surface. 
