NO. 1692. DRAGON' FLIES OF THE MISSISSIPPI VALLEY— WILSON . 665 



XIX. CLINTO.N, lOW.V, .TTILY ;50 AND .SI. 



From Giittenbiirg to Clinton the shore was dry and sandy and 

 yielded nothing but Argin tibialis (Rambiir) and Argia apicalis 

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

 Selys. 



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

 the shore, and here the two species of Gomphus were specially abun- 

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

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

 even a single specimen of dragonflies or d'amselflies 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, lOW.V, .TULV 30. 



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

 were very few dragonflies or damselflies to be seen. Epicordulia prin- 

 ceps (Plagen), Tetragoneuria cynosura (Say), Perithemis 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 growth 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. iESHNA JUNCEA VERTICALIS (Hagen). 



Two specimens taken in the liigh bushes back from the shore. 



2. EPICORDULIA PRINCEPS (Hagen). 



A single specimen seen patrolling the river bank. , 



3. LIBELLULA -PULCHELLA Drury. 



Common evex'ywhere along the banks and over the vi^ater. 



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 ou the banks. 



