Dumerils can be finicky eaters as juveniles but seem to grow out of it. What kind of substrate are you using? With my pair, I got more regular feeding after I placed them on aspen shavings which they can burrow under and hide. A good snug hide comes in as a close second. They like to feel secure and hidden. Of all my boas and pythons, the pair of dumerils I have are the least likely ones to be seen in the open - they are typically under their substrate or in their hides. Leaving f/t prey in the cage overnight is a good trick as well as it is usually gone by morning. It's best to leave the prey item in the cage and then leave them alone, preferably in the dark...even now at four years old my pair won't eat if watched. If you use a hide box instead of aspen shavings, place the rodent in front of their hide (providing they're in it) or near their heads if you use aspen (be sure to use tongs or hemastats as many will strike the prey when it comes near their heads). As for pronunciation, it is Doom-er-ells.
Good luck with your new addition, they're great snakes. 
Raven