An associational study of Illinois sand prairie . 109 or parasitic animals. The Cicindelidae are dominant forms among insects; they arecharacteristic of open formations, usually where the ecological in-fluence of vegetation is subordinate to physical conditions of theenviromnent. In the sand-prairie three species represent the group,four others occassionally being present; physical conditions of thesand prairie are nearly the optimum for tiger beetle development;they thus are much more characteristic of this formation and form amore important part of it, than of more luxurious formations, as t
An associational study of Illinois sand prairie . 109 or parasitic animals. The Cicindelidae are dominant forms among insects; they arecharacteristic of open formations, usually where the ecological in-fluence of vegetation is subordinate to physical conditions of theenviromnent. In the sand-prairie three species represent the group,four others occassionally being present; physical conditions of thesand prairie are nearly the optimum for tiger beetle development;they thus are much more characteristic of this formation and form amore important part of it, than of more luxurious formations, as theblack-soil prairie or the deciduous forest. In the sand-prairie theCicindelidae are probably more important than the Garabidae, by whichthey are overwhelmingly subordinated in black-soil prairie. Cicindela formosa generosa Dej. Ju^e 25, July 12,16,22, October 6 This large species lays eggs in May and June. The generationlasts two years as described in the generic discussion. The burrow, vertical for most of its length, opens obliquely atthe to
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