112 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY 
Wind Carriage 
That besides the nii{i;ratory movements Odonata arc at times 
carried many miles by high winds seems very probable. Although 
the arrival of a tattorod spocimon in a locality far beyond its nor- 
mal range may be due to the migratoiy instinct, nevertheless, in 
several cases of this kind that have been noted by the author high 
winds have preceded such arrivals. These in the author's experi- 
ence, have so far, save for one instance, been confined to the migra- 
tory month of September. The recording of such occurrences if 
made in July and August would be of much interest. The instances 
above referred to were: Somaiochlora vKilshii at Concord, Mass., 
Aeshna inlerrwpta at Wenham, Mass., and Agrion maculatum at 
Chatham, Mass. 
Distribution of Species 
No matter what disagreement exists in regard to the acceptance 
of the life zones of the north-temperate regions, all zoogeographers 
admit at least the presence of a Boreal or northern fauna, and an 
Austral or southern one. All arguments arise in dealing with the 
proper assignment of northern species that overlap and southern 
species that underlap in the intermediate regions. The author be- 
lieves that as in the recognition of subspecies, the aim of all bio- 
logical study should be to present only important distinctions for 
general use, acknowledging of course the interest of individual 
cases, and individual specialized investigation. 
In the following lists the term "eastern" refers to species which 
inhabit the regions east of the Mississippi-Missouri Rivers, and the 
Prairie Provinces of Canada; the term "east-central" to those 
that cross to the western limits of the eastern humid belt, or far 
more rarely into the arid eastern slope of the Rocky Mountains as 
well. " Ti'anscontinental " refers to species that cross the Rocky 
Mountains to the Pacific Coast States or Provinces. The typically 
boreal species are represented by more than double the number of 
transcontinental species probably largely owing to the lack of high 
north and south mountain barriers in the region, and because of 
their holarctic origin. 
It is to be noted that species having a short flight season or 
imaginal life, flying in either spring, summer, or autumn, generally 
the first or the last, are boreal in origin, while austral species, on 
