Phidippus mystaceus is a species of jumping spider that is found in North America. Females grow to about in body length.
Etymology The species name is derived from the Ancient Greek mystax, meaning "moustache", which the females of this species feature. An older synonym of the species is P. asinarius, referring to the markings above the eyes that look similar to donkey ears.
References
Further reading Roach, S.H. (1988). Reproductive periods of Phidippus species (Araneae, Salticidae) in South Carolina. Journal of Arachnology 16:95-101. PDF.
External links
Many pictures of P. mystaceus at BugGuide