In summarizing the work done On Oryzaephilus surinamensis it may be said that it presents possibilities for further investigation. It is a suitable insect for experimental genetics for: (1) Although the variations are somewhat indefinite two have been found to be inherited. (2) It lends itself to laboratory breeding. (3) The males and females can be distinguished easily. (4) Under optimum conditions a generation is obtained every thirty to thirty-four days.