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PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 



11. ARGIA TIBIALIS (Rambur). 



Found in company with A, mrjcsta putrida, and about as common. 



12. LESTES VIGILAX Hagen. 



A single specimen talven in tile tliiclv weeds. 



13. ISCHNURA VERTICALIS Say. 



Also rare ; a few specimens secured in a patch of long grass. 



14. ENALLAGMA GEMINATUM Kellicott. 



Rare; a few found in company with /. verticalis. 

 At a landing a couple of miles above the town on the river bank an 

 hour's search revealed nothing but Argia moesta putrida^ and seem- 

 ingly the locality was fully as favorable as this other one. 



XXII. BURLINGTON, IOWA, AUGUST 3 TO 6. 



1. ANAX JUNIUS (Drury). 



Several seen and one found nuitilated on the shore. 



2. ^SHNA CLEPSYDRA Say. 



A single male captured in the woods near the river. 



3. TETRAGONEURIA CYNOSURA (Say). 



Several seen along the water's edge. 



4. LIBELLULA PULCHELLA Drury. 



Common everywhere, particularly along the western bank of the river. 



5. PLATHEMIS LYDIA (Drury). 



Rare; only a few males seen. 



6. GOMPHUS DESCRIPTUS Banks. 



A couple of females secured on the rocks near the river. 



7. ERYTHEMIS SIMPLICICOLLIS (Say). 



Common on both banks near the water. 



8. PERITHEMIS DOMITIA (Drury). 



A single pair taken on the west bank. 



9. PACHYDIPLAX LONGIPENNIS (Burmeister). 



More common on the eastern bank of the river. 



10. SYMPETRUM RUBICUNDULUM (Say). 



Found in company with Paclujdiplax longipennis on the eastern bank of 

 the river. 



11. ISCHNURA VERTICALIS (Say). 



Common everywhere in the grass along the water's edge. 



13. ARGIA TIBIALIS (Rambur). 



Found in the more open places and very common. 



13. ARGIA APICALIS (Say). 



Found with A. tiMalis and nearly as common. 



14. ARGIA MCESTA PUTRIDA (Hagen). 



Common on the western bank, but none could be found on the eastern side ; 

 prefers the rocks and sand along the water's edge. 



15. ENALLAGMA ANTENNATUM (Say). 



A single male secured in company with Ischnura. 



16. HET^RINA AMERICANUA (Fabricius). 



A single male was secured from O'Connell slough which had escaped from 

 its pupa case so recently that its color was not yet defined. 



There was no evidence of colonization here, but a fairly even dis- 

 tribution of all the species. Several individuals of Libellula pul- 



