|Lynx Spider - Oxyopes salticus|
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Live adult male and female lynx spiders photographed at DuPage County, Illinois, USA.
Green Lynx spiders, like all others in the family Oxyopidae, are diurnal, that is, they hunt during daylight hours. Their hunts are conducted much like those of the jumping spiders (Salticidae); they roam low foliage, leaping about looking for prey items. They trail a dragline when leaping, but never construct webs for prey capture. Their eyesight is not as keen as the jumping spiders, and they more often use the "wait and pounce" hunting tactic most often associated with the (equally well) camouflaged crab spiders, Thomisidae. Oxyopids of North America are characterized by the presence of numerous large, erect spines on the legs and their erratic and sudden movements.
Studies have shown the green lynx spider to prey on many species of insect, with insects in the Order Hymenoptera being the most common, comprising over 40% of all captures. Diptera (true flies) accounted for fully 15% of all prey. It must be kept in mind, as well, that spiders serve as food for many other types of organisms, principally birds. 
P. viridans is the largest lynx in North America. Lynx spiders pose little danger for humans. Although there have been a few cases of human envenomation, the bites do not cause much more than temporary pain and swelling at the site, and no tissue damage or aftereffects.
Little is known about the chemistry of the venom, but it has been discovered that P. viridans, alone among spiders, is capable of ejecting its venom in a forward-pointing spray which can reach a distance of 20 centimeters (about 3/4 inch). When the spider is assaulted, say, by grasping one of its legs with a forceps, it whips around to face the offending instrumentation and forcefully discharges the venom in multiple directions from its fangs. Nothing is known about the defensive effectiveness of this procedure, or whether the spider also uses it preemptively.
Lynx spiders are among the major predators of insects low shrubs and grasses. Few detailed observations have been made on the feeding habits of lynx spiders, but investigations by W.H. Whitcomb have disclosed that the lynx spiders are important predators of crop-damaging insects. In the field, green lynx spiders have been observed feeding on many species of moths of the families Noctuidae, Geometridae, and Pyralidae, including some of the most important crop pests. Oxyopes salticus, one of the most common spiders in Arkansas cotton fields, has been reported as the chief predator of the bollworm, Heliothis zea. Peucetia viridans also preys on this pest.
However, their usefulness in the control of insect pests is counteracted by their propensity to prey also upon beneficial insects. These spiders seize large numbers of honey bees, and sphecid and vespid wasps. Members of the vespid genus Polistes which, themselves, are important predators on crop pests, are especially favored as prey by lynx spiders. Many species of Diptera, including syrphid and tachinid flies are also prey for lynxes. 
1. Prey Records of the Green Lynx Spider, Peucetia viridans John B. Randall Journal of Arachnology, Vol. 10
2. Brady AR. 1964. The lynx spiders of North America, north of Mexico. Museum of Comparative Zoology
3. H.V. Weems, Jr., W.H.Whitcomb, Florida Dept. of Agriculture, DP Entomology Circular 181. (.pdf)
4. Thomas Eisner, Maria Eisner, and Melody Siegler, Secret Weapons: Defenses of Insects, Spiders
Class Arachnida / Order Araneae: Spiders are the largest group of arachnids. They are easily recognized by their eight legs, and there are few creatures great or small that elicit such irrational fear in mankind. The vast majority of spiders are completely harmless and offer beneficial services, chief of which is keeping the burgeoning insect population in check. I am continually amazed at the resourcefulness of these supremely successful predators.
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