660 PROCEEDINGS OF THE Y.4T/0.Y.1/. MUSEUM. vol. xxxm. 



11. LIBELLULA LUCTUOSA Burmeister. 



Both sexes foiuid at a small pond south of the town. 



12. PLATHEMIS LYDIA (Drury). 



Both sexes found at the same pond with LibcUuhi liictaosa, 



13. CALOPTERYX ^QUABILIS Say. 



A single pair seen in the slough opi)osite Prescott. 



14. HET.ffiRINA AMERICANA (Fabricius). 



A single specimen seen on the island oiiposite the town. 



15. ENALLAGMA HAGENI (Walsh). 



Sparsely scattered along the river's edge. 



16. ENALLAGMA EBRIUM (Hagen). 



A few found with E. hagciiL 



VI. STILLWATER, MINNESOTA. JULY 15. 



On the St. Croix IJiver; the banks of the river are high and dry and 

 well wooded, except an area just opposite the town where formerly 

 stood a large sawmill. The refuse accumulating from this mill has 

 formed a terrace along the river's edge elevated well above the Avater 

 and without a shred of vegetation anywhere upon it. 



1. LIBELLULA QUADRIMACULATA Linnseus. 



Found by the hundreds in the old lumber yard on the bank of the St. Croix 

 opitosite Stillwater : every stick, stub, and bush alive with them. They 

 were very tame, alighting not merely on the net but also on the hand 

 and arm and all over the clothing. This and the other four species 

 here listed were the only dragonflies seen. 



2. LEUCORHINIA INTACTA (Hagen). 



Common, but not nearly as numerous as LihrJluhi •/iKKirintaciihita. 



3. ARGIA TIBIALIS (Rambur). 



Both sexes flying about in the open sunshine in company with J/thcllnJn 

 (/uddrhiKiciildta and Leurorhinifi iiifocfii. 



4. ARGIA APICALIS (Say). 



A few males found in company with .1. tihinU-s. 



5. PLATHEMIS LYDIA (Drury). 



Both sexes found on the river bank a little below the lumber yard. 



VII. LILY LAKE, STILLWATER, MINNESOTA, .IILY ] 6. 



A small sheet of water on the high ground to the west of the town ; 

 its western and northern banks are covered by dense underbrush, the 

 eastern and southern banks cleared and occupied by dwellings. From 

 the southeast corner proceeds a small outlet, Avinding about through 

 soft, marshy land. The dragonflies Avere most abundant along this 

 outlet and on the margin of the lake in its immediate vicinity. 



1. EPICORDULIA PRINCEPS (Hagen). 



A few seen patrolling the shore; one male captui'ed. 



2. LIBELLULA LUCTUOSA Burmeister. 



Both sexes quite plentiful in one restricted area at the northwest corner of 

 the lake. 



3. LIBELLULA PULCHELLA Drury. 



Common, many of the females just out of their pupa cases, 



