The Biofuels Digest Index, an index of publicly traded biofuels stocks, dropped 1.12 percent to 77.05 as ethanol equities tanked anew. For the day, Aemetis (AMTX) fell 4.69 percent to $8,54, while Pacific Ethanol (PEIX) sank 10.29 percent to $16.83. Among other equities, Green Plains (GPRE) fell back 5.36 percent to $39.38. Overall, declines led advances 5 to 3 for the day.