). 1692. DRAGONFLIES OF THE 3IISSI8SIPPI VALLEY— WILSON. 557 



11. LEUCORHINIA PROXIMA Calvert or FRIGIDA Hagen. 



Both sexes secured. Males with yellow spots along the back of the thorax 

 and the first five abdominal segments ; seventh, eighth, and ninth seg- 

 ments much dilated ; two large yellow spots on the ventral surf5:i,ce of 

 second segment; lower appendages fused with a much shallower notch 

 between them than in intacta. Females with the basal half of the 

 wings, or at least to the inclosing of the triangle, colored red; dorsal 

 yellow spots like the male but not as distinct ; ventral surface of second 

 lo seventh segments becoming pruinose. 



12. SYMPETRUM RUBICUNDULUM (Say). 



A single pair secured ; no others seen ; easily distinguished even at a dis- 

 tance by its brilliant red color. 



13. ENALLAGMA SIGNATUM (Hagen). 



Quite common flying about the floating alg«ie. 



14. ENALLAGMA CARUNCULATUM Morse. 



Fairly common, but not as plentiful as E. chriinii and E. hageni. 



15. ENALLAGMA EBRIUM (Hagen). 



Both sexes very common in the grass along shore. 



16. ENALLAGMA HAGENI (Walsh). 



Most common of all the damselflies ; both sexes found everywhere in the 

 grass and weeds along shore, 



17. ENALLAGMA ANTENNATUM (Say). 



Rare, only a few seen; found on rushes over the water. 



18. ISCHNURA VERTICALIS (Say). 



Quite common in company with Enallagma hageni; both sexes secured. 



19. LESTES INEQUALIS Walsh. 



Rare, only a single female secured. 



20. LESTES VIGILAX Hagen. 



A little more numerous than L. inequalis; mostly males. 



in. BEAVER LAKE, ST. PAUL, MINNESOTA, JULY 10. 



Nearly east from St. Paul, a small lake with a portion of the banks 

 high and sandy and a portion low and swampy, everywhere covered 

 with a dense gro\A^th of vegetation, underbrush, w^eeds, and grass. 

 The two dragonflies which were most abundant were found on the 

 high sandy banks, while the damselflies were captured in the low and 

 wet places. 



1. LIBELLULA EXUSTA Say. 



Abundant everywhere, most common with qiiadrimaculata in the under- 

 growth close to the shore. When it alights it squats like a Oomphus 

 on the rocks, stumps, and even on the ground. It is gregarious, as 

 many as fifteen or twenty alighting on the same spot ; it is also inquis- 

 itive and many were caught that actually alighted inside the net as 

 it was being carried. The males are predominant and are all pruinose 

 thus early, even the two antehumeral stripes showing clear w^hite. 



2. LIBELLULA QUADRIMACULATA Linnaeus. 



Everywhere in. company with the preceding ; when it alights it does not 

 squat but perches on a twig, holding its body horizontal even if the 

 twig is vertical. It is gregarious, like the preceding species, from 



