DRAGONFLIES OF DOUGLAS LAKE REGION. 41 



Burt Lake, about one and one-half miles south of Douglas Lake, 

 constitutes another of the habitats from which collections were made. 

 On the north shore of this lake is Reese's Bog which is densely wooded 

 and occupies an area of several hundred acres. This bog has no area 

 completely inundated but the whole is more or less wet and there are 

 several small outlet streams. The tamarack growth over the whole 

 area is very dense with here and there narrow roads passing through it. 

 Collections were made along the shore of the lake as well as along the 

 roads leading through the bog. 



North Fishtail Bay. a quiet and shallow little bay on the north shore 

 of Douglas Lake, together with the pools and open areas in the ad- 

 joining woods, formed another of the situations collected from. A 

 large number of both nymphs and adults were collected from tins 

 habitat. 



From the shallow waters along the shore of the lake near camp and 

 about the docks a numl^er of species were secured which wer(» not foinid 

 elsew^here. Also the aspens near the Station were foimd to contain 

 adults, some of which were seen nearly a mile from the water. 



TAXONOMY. 



Keys have been made for all species collected and all previously 

 reported from the region, except those included in the difficult genus 

 Enallagma Charpentier. Where a genus includes more than one species 

 in the Douglas Lake Region, a key for the various species collected and 

 previoush' reported is offered. Under the species head short dis- 

 cussions of the habitats, time of appearance, and abundance are given 

 when the data were obtained. The nomenclature offered by Muttkow- 

 ski^ is followed. Free use has been matle of certain other ])ul)lished 

 reports on Odonata (see bibliography) to which the writer wishes to 

 acknowledge his obligations. 



KEY TO THE SUBORDERS AXD FAMILIES OF THE ODOXATA OF THE DOUGLAS 



LAKE REGION (MICHIGAN). 



Imagos. 



A. Front iiiid hind wings similar iii outline, spatulate and distinctly narrowed at the base, 

 not held horizontally when at rest; head much wider tha.i long; whole insect of a more 

 or less trail appearance. * 



Suborder ZYGOPTER.\ 



B. Wings rich black or dusky brown, or if hyaline w.tli blight red or l)r(iwn areas 

 at the bases. 



Family Agrionidae 



BB . Wingd hyaline — t)luish or transparent. 



Family Coeiiagrionidae 



'Bull. Public Mus. Milwaukee, I, 101 0-1 911. pp. 1-208. 



