650 PROCEEDINGS OF THE NATIONAL 2IU8EUM. vol. xxxvi. 



11. LIBELLULA LUCTUOSA Burmeister. 



Botli sexes found at a small pond south of the town. 



12. PLATHEMIS LYDIA (Drury). 



Both sexes found at the same pond with LiheUula luctuosa. 



13. CALOPTERYX ^QUABILIS Say. 



A single pair seen in the slough opposite Prescott. 



14. HET^RINA AMERICANA (Fabricius). 



A single specimen seen on the island opposite the town. 



15. ENALLAGMA HAGENI (Walsh). 



Sparsely scattered along the river's edge. 



16. ENALLAGMA EBRIUM (Hagen). 



A few found with E. hagciii. 



VI. STILLWATER, MINNESOTA, JULY 15. 



On the St. Croix lliver ; 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 water 

 and w^ithout 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 

 opposite Stillwater ; every stick, stub, and bush alive with them. They 

 were vfery 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 Lihellula qaadrlmaculata. 



3. ARGIA TIBIALIS (Rambur). 



Both sexes flying about in the open sunshine in company with Libellnla 

 quadrimaculata and Leucorhinia Intacta. 



4. ARGIA APICALIS (Say). 



A few" males found in company with A. tilnalis. 



5. PLATHEMIS LYDIA (Drury). 



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



VII. LILY LAKE, STILLWATER, MINNESOTA, JULY 3 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, winding about through 

 soft, marshy land. The dragonflies were 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 captured. 



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. 



