54 PAPERS ON ZOOLOGY OF MICHIGAN. 



Syynpetrum scoticiwi (Donovan). — Reported on August 11, 1910. 

 No habitat data given. 



Symyetrum dbsirusum (Hagen). — This species was reported as com- 

 mon in the region from July 23 to August 20, 1910. No habitat data 

 were given. It was not included in the 1914 collections. 



Sympetrum costiferum (Hagen). — Reported in 1910. 



GENUS PACHYDIPLAX BR~AUER. 



Pachydiplax longipennis (Burmeister) .^ — One nymph of this species 

 was collected about two miles down stream from the lake in Maple 

 River, where it was found among trash and vegetation along the shore. 



GENUS LIBELLULA LINNE. 



KEY TO THE SPECIES OF LIBELLULA. 



Images. 

 A. Wings with no nodal spots. 



L. cyanea 

 AA. Wings with large nodal spots. 



L. pulchella 



Nymphs. 



A. Dorsal hooks on the seventh and eight abdominal segments long and sharp; lateral setae 

 six. 



L. cyanea 



AA. Dorsal hooka on the seventh and eighth abdominal segments rudimentary; lateral setae 

 eight or nine. 



L. pulchella 



Lihellula cyanea Fabricius. — The nymphs of this species were col- 

 lected at the station on Maple River about two miles down from the 

 lake. They were taken among trash along shore. 



Lihellula pulchella Drury. — This species was taken in both the 

 nymph and the adult stages. They were found common about North 

 Fishtail Bay as well as on Maple River. The nymphs were taken in 

 trashy situations along the shore; the adults flying about near the 

 shore. 



GENUS TRAM E A HAGEN. 



Tramea lacerata Hagen. — Nymphs of this species were among the 

 most common forms collected. A single "dip of the net through the 

 submerged vegetation in Bryant's Bog would usuallj^ yield twenty or 

 more of the nymphs. The nymphs were also found in both Smith's 

 and Reese's Bogs. Although large numbers of nymphs were collected 

 no adults were obtained. 



