46 PKOCEEDINGS ENTOMOLOGICAL SOCIETY 



river, traverse the valley, especially iu its southern part, and 

 are margined with a large variety of water and marsh vegeta- 

 tion. 



The Austroriparian flora of the county is of three types 

 the oak belt, the river woodlands, and the marsh lands. In 

 other words, it contains both mesophytes and hydrophytes. 

 The Lower Souoran flora is all xerophytic and either prairie 

 or chaparral brush. Of course there are many transition 

 areas where the timber of the two floras is intermingled. The 

 trees of the river valleys include Populus deltoidcs, Salix, 

 Hicoria pecan, Qiicrcus breriloba, Q. marilandica, Q. mac- 

 rocarpa, Q. minor, Q. vitginiana, Ulmus, Celtis, Alorus, 

 Cratcegus mollis, Primus, Gleditsia triucanthos, Bnmelia 

 lanuginosa. Tillandsia iisneoides, the Spanish moss, and 

 mistletoe {Phoradendron flavescens) are common on the bot- 

 tom-land timber. Among the mesophytic weeds and shrubs 

 are to be included Rnbits, Cassia occidentalis, Cardiosper- 

 rtium halicacabum, CalUnhoe involucrata, C. lineanloba, 

 Iponuva sinuata, Convolvulus, Cuscuta, Solanum rostratum, 

 Iva ciliata, Ambrosia psilostachya, A. trifida, Xanthium, 

 Rudbeckia amplexicauhs, Helianthus, Verbesina virginica. 

 Of the hydrophytes the following require mention: Wild rice, 

 joint-grass, C\perus virens, Rynchospora cornicnlata, Poly- 

 gonum, Lud-wigia natans, Pluchea camphorata. 



The commonest crops are cotton {Gossypium hirsuticm}, 

 corn(Zea mays} ,canteloupes( Cncumis meld} , and sweet potato 

 (Ipomaa batatas}. Pecans (Hicoria pecaji} are grown very 

 extensively, as are also figs (Ficns}, and peaches (Amygdalis 

 perscia}. The chinaberry tree (Me/id azedarach} is very 

 common in yards, and the palma christi bean {Ricinus com- 

 munis}, is also an introduced plant. 



The L/ower Sonoran flora comprises the following chaparral 

 timber: Rhretia elliptica, Acacia rccmeriana, Vachellia farne- 

 siana, Prosopis glandulosa, Zanthoxylum clavaherculis 

 (planted along fences), Guajacum angusiifolium, with the 

 characteristic bunch mosses, Tillandsia bailey i and T. ?ectir- 

 vata. The prairie vegetation comprises 1'ucca, Cassia cham- 

 (pchrista, Croton capitains, C. eiigelmanni, Opitntia spp., 

 Euphorbia marginata, Solanum cleagnifolinm, S. rostratum, 

 Amphiachyris dracunculoides, Leucosyris spinosa, Carduus 

 spinosissimiis. 



On the following pages we present a list of the weevil records 

 for the county. 



