A square-framed, conical net (300-μ pores) was used in the kicking technique described herein for sampling the larger invertebrates of stony streams. Small samples have consistent percentage population components differing significantly from large ones. Even when bottom-dwellers are numerous, less than 20% of those present are collected (including less than 5.4% of the truly lithophilic species).Almost 60% of the fauna collected from any one site is taken at the first kick. Three kicks yield almost 90% of the organisms secured by 10. Some organisms bypass the net or swim from or through it, and if the net is maintained in position for any length of time, stream-drift animals will mask the sample.
A large number of individuals of many insect species visited the flowers of milk—weed (Asclepias spp.). Most of these insects revealed pollinia attached to various appendages. Some were captured and held prisoners; others were able to free themselves. A relatively small number were able to avoid these traps. The largest number of pollinia adhered to the hairs of the tarsi, pulvilli, and mouth parts. This might be expected as these are the appendages most closely associated with flower visitation.
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