100 PRELIMINARY NOTES ON THE ODONATA. 
Genus Plathemis Hagen. 
P. lydia Drury. Taken in numbers at Alden, June 10-20, 1914; at 
Mankato from June 1 to August; Wilson’s records cover July 12-20, 
1907, at Hastings, Stillwater, Red Wing, Winona and Homer. 
This species is a constant companion of L. pulchella. Often they 
have a definite beat along some bend in the shore or around beds of 
bulrushes where they race up and down the banks, now and then meet- 
ing with a rustle of wings. The female of lydia very much resembles 
L. pulchella. 
Genus Celithemis Hagen. 
C. eponina Drury. At Lake Madison, August 4-11, 1914, this 
species was more numerous than any other, except certain damsel- 
flies. The lake having fallen several feet in the past few years has in 
many places about its shores wide gravel flats, grown up to shrubs and 
tall-stemmed weeds. It was upon these flats that Celithemis was most 
common, in fact, it was seldom seen elsewhere. A few were taken on 
August 4th along a bay filled with cat-tails, bulrushes and sedges. On 
the 5th they were present in great numbers on the gravel flats, not- 
withstanding that the day was very dull and a steady drizzle of cold 
rain falling. They were covered with glistening rain-drops, which 
were shaken from their wings as they fluttered from perch to perch. 
In bright weather they were much more agile and quite difficult to 
capture. When in copulation, they would often ascend fifty or sixty 
feet and dart off over the lake for a time. During windy days, and it 
was very windy whenever it was bright, they seemed to delight in 
battling with the gale and in clinging like weather-vanes to the tallest 
weed-stalks, their wings half set. 
Celithemis is distributed over the whole of the Austral and the 
Transition Zones and other species will likely be taken, especially elisa. 
Genus Leucorhima Brittinger. 
L. intacta Hagen. During June and July intacta is to be seen daily 
about our ponds. In 1913 the first record at Mankato was June 7th, and 
August 11, 1914, a single female was taken at Lake Madison; the 
writer possesses dozens of specimens collected between these dates at 
Mankato. Wilson also took the species all along the Mississippi. They 
are usually very alert and agile, floating before the cqllector like a host 
of jet-black ivory-centered balls. When resting, the wings are thrown 
forward, the abdomen held high in the air and the head is kept turning 
watchfully from side to side. 
