DRAGONFLIES OF DOUGLAS LAKE REGION. 53 



GENUS CELITUEMIS HAGEN. 



Celithemis e'ponina (Drury). — Nymphs of tliis species were collected 

 in the aquatic vegetation in Bessey Creek. Their frequent appearance 

 in collections from Bessey Creek marks the species as a rather common 

 form. No adults were taken. 



GENT'S SYMPETRlWr XKWMAX. 



I mou')"- 



A. Superloi appendages ol the male with a prominent, inferior, median tooth; vulvar lamina 

 01 the female divided by a median cleft into two lobes. 

 B . Wings with the basal half flavescent. 



S. assimilaluni 



BB. Wings flavescent only at the extreme nase, or at least not beyond the nodus. 



C. Branches of the geiutal haniules of the male enclosing an oval notch, 

 outer branch twice as -stout as the inner, both equally curvf d. 



D. Median inferior tooth ot tlie superior male appendages bearing 

 two or three minute teeth and preceded by lour large coarse 

 teeth; inferior appendage of the male with a terminal recurvetl 

 hook. 



.S. scoticum 



DD. Median jiiierior tooth of the superior male appendages 

 simple, and preceded by three coarse teeth; terminal hcoK 

 of the inferior appendage not recurverl. 



S. rubtcundulum 



CC . Branches of the genital hamules oi the male enclosing ,i short rounded 

 notch, the inner branch more sharply mcurved, the outer branch about 

 four times as thicl< as the inner. 



S. obtrusum 



AA. Superior appendages of the male without a prominciit, inferior, median tooth, but w»th 

 several small, inferior, subequal. pointed denticles, wings flavescent only at the base. 



S. costiferu m 



Nymphs. 



A. Dorsal hooks of abdominal segments six to eight long and sharp, about as long as their 

 respective segments; lateral spines straight. 



S. cosliferum 



AA. Dorsal hook of abdominal segments six to eight shorter than the segments bearing them 

 and less pointed than in the preceeding species. 



S. assimilatum 

 S. ruhiciniduhim 

 S. obtrusum 



Owing to the incompleteness of the knowledge of the nymphs in this genus the above key 

 gives the diagnostic characters of but one species. No description of the nympli of .S. scoticum 

 (Donovan) was found. 



Sympetrum assimilatum (Uhler). — Reported from the region in 1010, 

 a male and female being taken in coiiu, as well as a number of other 

 specimens. 



Sympetrum ruhiundulum (Sa30- — This species was common near 

 North Fishtail Bay and at Smith's Bog. Adults were al)untlant in a 

 little relic bog near North Fishtail. Nymphs were taken in numbers 

 from Bessey Creek, the North Fishtail beach pool and at Smith's Bog. 



