,.1692. DRAGONFLIES OF THE MISSI8SIPPL VALLEY— WILSON. ^65 



XIX. CLINTON, IOWA, JULY 30 AND 31. 



From Guttenburg to Clinton the shore was dry and sandy and 

 yielded nothing but Argia tibialis (Rambur) and Argia apicalis 

 (Say), and the two species of Gomphus^ vastus Walsh and externus 

 Selys. 



At Send Prairie, Illinois, the sand was raised in high bluffs along 

 the shore, and here the two species of Gomphus w^ere specially abun- 

 dant. Elsewhere even the species of Argia were scarce and no other 

 kinds were seen. At several of the landings just above Clinton not 

 even a single specimen of dragonflies or damselflies could be found 

 by careful and long-continued hunting. Taken all in all, this was 

 the most barren section of the river encountered during the entire 

 season, except that between St. Louis and Cairo. 



XX. LE CLAIRE, IOWA, JULY 30. 



The shores at this place were high, dry, and sandy, and there 

 were very few dragonflies or damselflies to be seen. Epicordiilia jjrin- 

 ceps (Hagen), Tetragoneuria cynosura (Say), Peritliemis domitia 

 (Drury), and Argia tibialis (Rambur) comprised all that could be 

 found, and of the first three only a single specimen was seen. 



XXI. MUSCATINE, IOWA, AUGUST 1. 



Here the shore was low and covered with a rich grow^th of weeds, in 

 which there was the greatest variety of dragonflies and damselflies, in 

 the smallest space, of any locality on the river. 



Only a few moments could be spent in collecting, but in that time 

 14 species were secured. 



1. ^SHNA JUNCEA VERTICALIS (Hagen). 



Two specimens taken in ttie high bushes back from the shore. 



2. EPICORDULIA PRINCEPS (Hagen). 



A Single specimen seen patrolling the river bank. 



3. LIBELLULA PULCHELLA Drury. 



Common everywhere along the banks and over the water. 



4. LIBELLULA LUCTUOSA Burmeister. 



A few males found in the weeds along shore. 



5. GOMPHUS AMNICOLA Walsh. 



A single pair captured on the rocks at the water's edge. 



6. ERYTHEMIS SIMPLICICOLLIS (Say). 



Males common on the river bank, but only a few females seen. 



7. PACHYDIPLAX LONGIPENNIS (Burmeister). 



A single specimen taken in the thick undergrowth. 



8. PERITHEMIS DOMITIA (Drury). 



A single female captured at the water's edge ; no others seen. 



9. SYMPETRUM VICINUM (Hagen). 



Fairly common along the edge of the woods back from the river bank. 



10. ARGIA MCESTA PUTRIDA (Hagen). 



Common everywhere in the dry and open places on the banks. 



