on my observations. Here in East Arkansas D. missouriensis and D. texanus seem to be equally common, and often side by side. But I find I cannot separate them in the field. In the hand, texanus has smoky wings, usually with blackish or brownish color in them, whereas missouriensis has whitish more or less see-through wings. Also texanus has black marking coming clear over the dorsal surface of the first few abdomenal segments, whereas on missouriensis the black markings end on the sides of the abdomen, and only reddish coloring comes over the dorsal surface.

FIne shots. I think I can see the dividing line that extends all the way forward onto the prothorax on the central stripe. This would make it missouriensis. These are open area Diogmites. D. misellus prefer the shade. And the dark central line is not divided and turns a bright reddish on the forward prothorax.