Until recently, I have never used an incubator and have successfully hatched D. corais, D. couperi, erebennus, D. m melanurus, D. m rubidus and D. m unicolor.
Personally, I like to keep incubation temperatures between 72*F - 75*F for all of my Drymarchon spp. and while the lower temperatures equal longer incubation periods, it has been my experience the babies turn out larger and moer robust.
For my Drymarchon spp. eggs, I have started using the Avey ARTI (Ambient Room Temperature Incubator)as the unit both heats and cools, and while the Avey ARTI is pricey, Drymarchon eggs are worth every bit of the expense.
I lost a large number Drymarchon spp. eggs, including over 20 D. m rubidus eggs, last year due to over heating, so I would be EXTREMELY careful using an incubator.
Also, as many have stated, a high shelf in a quiet are where the temps average somewhere in the mid 70's, but do not soar above 80*F or drop below 68*F, will suffice and I still use this method for many of my eggs.
Best of luck to you luck,
Jeff
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Jeff Snodgres
University of Arkansas
snodgresjeffreys@uams.edu
501.603.1947