Pantarbes megistus is a species of bee fly in the family Bombyliidae. It is known only from the northern portion of the Mojave Desert in California.Hall, J.C. & Evenhuis, N.L. (1984) Bombyliidae. In G. C. D. Griffiths (Ed.), Flies of the Nearctic Region (Vol. V, pt. 13, no. 4, pp. 281-320). E. Schweizerbart’sche Verlagsbuchhandlung, Stuttgart.
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