An associational study of Illinois sand prairie . Dectes spinosus Say. June 28. Frequently found in dry or sandy regions. Associated with spe-cies of ragweed (Ambrosia), on which they breed. The larvae burrowin the The species ranges from New England to New Mexico andColorado. A prairie species. Taken at the Devils Hole. Mecas pergrata Say. June 25, July 5. Scarce, found also in the dry sands of southern Illinois andIndiana. This, like many other species, illustrates the principlethat insects of dry regions of the south find their northern limitsin sandy localities - edaphic extensions
An associational study of Illinois sand prairie . Dectes spinosus Say. June 28. Frequently found in dry or sandy regions. Associated with spe-cies of ragweed (Ambrosia), on which they breed. The larvae burrowin the The species ranges from New England to New Mexico andColorado. A prairie species. Taken at the Devils Hole. Mecas pergrata Say. June 25, July 5. Scarce, found also in the dry sands of southern Illinois andIndiana. This, like many other species, illustrates the principlethat insects of dry regions of the south find their northern limitsin sandy localities - edaphic extensions of the southern fauna; seep. Found in low herbage of open areas. A prairie Hole, in of Chrysopsis. Tetraopes Forst. June 6, 8, 24, July 1. A common and v;idely distributed species, found on species ofAsclepias. A prairie form, rare in the bunch-grass, however. Therailln?;eeds begin to bloom in June; the adult beetles are first seenat this time, continuing abundant?throughout the early part of 133 Tetraopes femoratus Leo. July 25, 29, August 15, 16, September 8. Closely resembling the preceding species, but with antennaeringed with gray at the joints. Found in drier situations than thepreceding, and occurring on different species of Asclepias, is common in late summer, as indicated by the dates, part ofwhich are from Harts records, while T. tetraopthalmus is an earlysummer species. This is apparently an example of time adaptation,by means of which closely related species avoid mutual competition. Typophorus canellus aterrimus Oliv. April 4. This is the first species, taxonomically, in the list of sandregion Chrysomelidae. This group of beetles is exclusively leaf-eat-ing. They are represented in practically all associations, and reachtheir development in tropical and sub-tropical regions. A very common species, often found on foliage of wild from under a log in bunch-grass bordering a cultivated fi
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