I purchased these unknown maggots from our local baitshop and decided to hatch them. They pupate as soon as they are left in room temp. It took them about a month to hatch. They are a very large black fly. Looks like a common house fly but bigger. Bait shop owner said most bait shops are carrying these. Don't know what to gutload these on. If anyone else has any info on these let me know. Thanks David