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DOF can be increased by using a small aperture (large f-stop). To get even greater DOF I am experimenting with Helicon Focus software. This software will merge several images taken at different planes to produce a single image. The program can be downloaded as a free trial; but it places text across the center of the image as in my examples. This text is removed when one purchases the software.
Note the DOF in this fly, the fly is 12.5 mm long and the distance from wing tip to wing tip, in this image, is 12.3 mm.
The software can also handle macrophotography - see head shot. Useful if one needs to show great detail of a part of a fly for identification purposes.
The method is not practical for field use and is best suited for dead insects; any movement of the insect between images will upset the final focus.