I found the reference below in the Offical Records, does anyone have another source about the formation of these two regiments?
From proceedings of the Military Board of the State of Arkansas.
Little Rock, November 8,1861.*
The board met pursuant to adjournment. Present, Governor Rector and Mr. Hill.
It being represented that the State was in danger of invasion, and that Colonel Borland's command was threatened with immediate attack, it was ordered that Brigadier-General Phillips be ordered to call out the Eighth Brigade ot Militia, and that he also order out one company each from the following counties, viz: Prairie, Monroe, Poinsett, Saint Francis, and Craighead.
(THE WAR OF THE REBELLION: A COMPILATION OF THE OFFICIAL RECORDS OF THE UNION AND CONFEDERATE ARMIES, SERIES IāVOLUME LUX, REPORTS, CORRESPONDENCE, ETC. page 752 - 756, Accessed 3 March 2010, http://books.google.com/books?id=fs8tAAAAIAAJ&pg=PA756&vq=Arkansas+Militia&output=text)