1911] Muttkowski, Wisconsin Dragonflies. '29 



In checking material from Chippewa county and the St. Croix 

 river, I note that there are some differences in coloration between 

 these and southern forms. These differences may be sum- 

 marized, as follows : 



1. St. Croix and Chippewa Counties. — Males with dorsum 

 of thorax dark metallic green, sides with coppery reflections 

 below, abdomen dark metallic green, from base to apex. Rarely 

 a coppery or dark blue (violet) reflection on dorsum of thorax 

 or abdouen when viewed from above. Females all with a distinct 

 coppery reflection on dorsum and lateral sutures of thorax. 



2. Milwaukee and Washington Counties. — Males with dis- 

 tinct dark blue or violet reflection on dorsum of thorax and basal 

 segments of abdomen, sides of thorax dark metallic green, not 

 coppery at sutures. Females metallic green on thorax, but with- 

 out coppery or violet lustre. 



3. Northern females with apices of wings decidedly more 

 strongly tinged with brown than Milwaukee females. 



Intermediates between these two groups are found in speci- 

 mens from Divide, Vilas county, and others from Cedar Lake 

 and Oostburg. in Washington county. 



If not identical with Hagen's hudsonica the northern speci- 

 mens will at least furnish a transitional stage between the south- 

 ern apicalis and the Lake Superior specimens from which Hagen 

 made his diagnosis. In view of this bridging of forms it is ques- 

 tionable if hudsonica can maintain its nomenclatural status, even 

 as a subspecies. 



LESTIN^). 



Lestes rectangularis Say. 



' Taken at Maiden Eock, Pierce Co., Wis., July 27-Aug. 3, 1910, one 

 male and five females; Aug. 4-10, two males and four females. 



These specimens were taken in a region north of the city of 

 Maiden Rock, on the shore of Lake Pepin, which, at the ordinary 

 summer depth of the Mississippi, is said to be very swampy. But 

 owing to the extraordinary drouth of the past summer the river 

 was very low and the swamp consequently high and dry, although 

 in places the bottoms were quite wet, as the members of the 

 expedition found through experience. The myriads of midges 



