DRAGONFLIES OF DOUGLAS LAKE REGION. 4'.) 



BR. R.idial sector not forked. 



D. Space between the arculii.'^ anil the base of the wing crossed by from 

 two to six cross veins; anal triaiiKle. In the male, three to five celled. 



Hoyeria 



I)D. Space between the arculus anil the base of the wing free or crossed by 

 but a single cross vein. 



Basiaeschna 



AA. Upper part of the arculus shorter than the lower; the upper sector rising about midway 



between the lower sector and the median vem above. 



.\na.\ 



Xymphs. 

 A. Five pairs ot lateral spines. 



B. Antennae SIX jointed. 



Epiaeschna 

 BB . Antennae seven jointed. 



C. Lateral lal)ial lobes scarcely tapering, subtruncate at the tij). 



Boyeria 



CC. Lateral labial lobes tapering to an incurved tooth. 



Basiae.schna 

 AA. Three or four pairs of lateral spines, 



D. Four pairs of lateral spines, the anterior pair small. 



Aeshna 

 DD. Three pairs of well developed spi.ies. 



Anax 



GENUS EPIAESCHXA HAGEN. 



Epiaeschna heros (Fabricius). — Adults of this large species were 

 common throughout the summer in various haliitats. These dragon- 

 flies were found along iVIaple River and Bessey Creek, about the bogs, 

 over the lake, about a mile from shore, and back in the aspens a mile 

 or more from water. One specimen was taken about seven-thirty p. 

 M., in the late twilight, as it was flying s\viftly about one of the roads 

 through Reese's Bog. Adults of this species were especially abundant 

 in the vicinity of Smith's Bog. 



GENUS BOYERIA MACLACHLAN. 



Boyeria vinosa (Say). — The nj-mphs of this species were taken in 

 numbers from the submerged vegetation at Bryant's Bog. No adults 

 were captured. 



GENUS BASIAESCHNA SELYS. 



Basiaeschna Janata (Say). — The nymphs of this dragonfly were finiiul 

 on vegetation in Bessey Creek and the adults were caught along both 

 Maple River and Bessey Creek. 



GENUS ,4£:S//.V.4 FABRICIUS. 

 Imagos 



A. Anal triangle of the hind .viiig of the male usually consisting of three cells; genital valve 

 of the female strongly elevated at the apex. 



,1 . rimstrirtn 



7 



