88 PRELIMINARY NOTES ON THE ODONATA. 
lands of the Commonwealth. The valley of the Mississippi, within the 
State, is more rugged and is occupied by the Big Woods. Here the 
forests run from wholly coniferous in the north to the ordinary de- 
ciduous trees in the south, its lower limit being a little north of Mankto. 
The third area is made up of the deeply eroded, though glaciated, and 
densely wooded valleys of the St. Croix and the Mississippi (between 
Dakota and Wabasha Counties). And the last division, described in 
an earlier paragraph, is the small driftless area of the southeastern 
counties. 
Preface to the Faunal List. 
The faunal list included in this paper relates to but a small part 
of Minnesota’s Transition Zone, that triangle which might be cut off 
by drawing a line from Nobles County through Hennepin to Washing- 
ton. The writer’s records from that part of Iowa which lies within 
the zone have also been included: Dickinson, Emmit, Winneshiek and 
Allamakee Counties. In Minnesota the counties in which collecting 
has been done are as follows: Blue Earth, Nicollet, Freeborn, Winona, 
Wabasha, Goodhue, Dakota, Washington, Ramsey and Hennepin. 
Most of the records along the Mississippi are taken from Wilson’s list 
for the Mississippi Valley. The remainder have been made by the 
writer, and on account of the latter’s location at Mankato, Blue Earth 
and Nicollet Counties have been more thoroughly worked than the 
rest. Lake Madison is a small lake some four or five miles in length in 
the northeastern part of Blue Earth County. 
In preparing the catalogue that follows, the species in the col- 
lections of the University at St. Anthony Park are not included. 
Through the kindness of Professor F. L. Washburn the writer was al- 
lowed to examine this material but as the specimens bore no locality 
labels and had been in the Department for some years their origin was 
not actually known. It is, however, more than probable that they are 
from the State and most likely from Ramsey and Hennepin Counties. 
The species in the Lugger collection determined with certainty follow : 
Calopteryx maculata. Erythemis simplicicollis. 
Ischnura verticalis. Pachydiplax longipennis. 
Hagenius brevistylus. Plathemis lydia. 
ZEshna_ constricta. Libellula luctuosa. 
Anax junius. Libellula quadrimaculata. 
Celithemis eponina. Libellula pulchella. 
Celithemis elisa. Libellula incesta. 
Sympetrum vicinum, 
Of these, but three, Celithemis elisa, Sympetrum vicinum and 
Libellula incesta, are not listed in the catalogue from definite localities. 
