Studies of Eastern Iowa Spiders

The spiders of Eastern Iowa included in this study constitute a part of a general geographical and seasonal survey of the spiders of Iowa. The majority of them have been collected by the authors, although much assistance has been given by others.1 For the first time some spiders have been collected from the woodland floor by the sifting of dead leaves and other debris. Most of them have been found in Linn County, but there are also species from Wapello, Henry, Muscatine, Pottawattamie, Black Hawk, Clayton, Louisa, and Washington counties. Of the ninety-four different spiders here reported, thirty-five species and ten families are represented. Twelve are males, seventy-seven females, and five immature spiders. For the first time, specimens of the family Gnaphosidae have been added to our collection. More species have been found of the orb weavers, the Argiopidae, than of any other family