The Johnson Jumping Spider does not build webs to catch its food. It seeks it out, wandering around until it happens upon a good prey item. These tiny spiders jump large distances (considering their size) to catch their prey. Olympic long jumpers have nothing on these little powerhouses. They are day-time hunters and hide out at night and in the winter.
They have been known to bite humans, but without serious effects. Females weave funnel-shaped webs to lay eggs in under rocks or between objects. Males have an abdomen that is completely red, whereas the female will have a black line down the center of her abdomen.
Common name: Johnson Jumping Spider
Scientific Name: Phidippus johnsoni
Other Names: Red Jumping Spider
Adult Size (Length): 7mm to 13mm (0.28in to 0.51in) COMPARE
Identifying Colors: black; red; white
General Description: jumping, biting, hairy
North American Reach (Though Not Limited To*): Arizona; California; Colorado; Idaho; Kansas; Montana; Nebraska; Nevada; New Mexico; North Dakota; Oklahoma; Oregon; South Dakota; Texas; Utah; Washington; Wyoming; Mexico
* Keep in mind that insect reach is not governed by lines on a map and therefore may appear in areas/regions/states beyond those listed above.