666 PROCEEDINGS OF THE NATIOy.iL MUSEUM. vol. xxxvi. 



11. ARGIA TIBIALIS (Rambur). 



Found in company with .^l. musta piitrida, and about as common. 



12. LESTES VIGILAX Hagen. 



A single specimen taken in tlie tliiclv weeds. 



13. ISCHNURA VERTICALIS Say. 



Also rare: a few specimens secured in a patcli of long grass. 



14. ENALLAGMA GEMINATUM Kellicott. 



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



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

 hour's search revealed nothing but Aryia mcesta 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 mutilated on the shore. 



2. .ffiSHNA 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 ^vater. 



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 Pachildii)hix loiiyijjcnnis on the eastern bank of 

 the river. 



11. ISCHNURA VERTICALIS (Say). 



Conmion everywhere in the grass along tlie water's edge. 



12. ARGIA TIBIALIS (Rambur). 



Found in the more open places and very conunon. 



13. ARGIA APICALIS (Say). 



Found with A. tibialis and nearly as conmion. 



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 Isclniura. 



16. HET.ffiRINA 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 Lihellula pul- 



