Thank you for your question.  This is not a spider, it's an insect.  Note it only has six legs, and spiders have eight.  The photograph is somewhat out of focus when you enlarge it, but this appears to be a wheel bug nymph (Arilus cristatus).

Wheel bugs are members of the assassin bug family.  They range from Rhode Island south to Florida and west to New Mexico.  They prey on many pest insects.  Wheel bugs get their name from the spiny ridge on their thorax that resembles a circular saw blade. Nymphs do not have the spiny ridge.  Nymphs feed on aphids and both nymphs and adults feed on caterpillars that defoliate trees.  

Wheel bugs can inflict a painful bite with their long beak.  Adults and nymphs should not be handled.  Wheel bugs have a toxic saliva they inject through their beak which paralyzes and kills their prey within approximately 30 seconds.  People have reported the bite as being more severe than a bee, wasp or hornet sting. Despite their bite, they are considered one of our beneficial insects.

For additional information, see:

http://aggie-horticulture.tamu.edu/galveston/beneficials/beneficial-09_wheel_bug.htm

https://www.ces.ncsu.edu/depts/ent/notes/O&T/shrubs/note65/note65.html

Hope this answers your question, and thank you for using Ask an Expert.

Jim