For diagrams of the genitalia of this species, see: 3I. For an image of a pinned specimen, see: BG.

Nymphs are reported to have a two-generation life-cycle, and have been taken in abundance in early July and in August (DeLong 1926).

NOTE: There appears to be a cryptic undescribed species in the Coastal Plain that has a combination of characteristics from both Crumbana arundinea and Sanctanus tectus. The large fuscous marks on the head are darker than in Crumbana, the vertex is not quite as pointed and long as Crumbana, there are three black marks along the costal margin of each wing (similar to S. tectus), there are incomplete blackish marks along the anterior margin of the pronotum (and the orange coloration on the pronotum looks closer to S. tectus), the legs are largely pale with some black markings (like Crumbana), and the face is whitish with scattered small black marks (unlike either species). Additionally, the pregenital sternite is lobate and does not match that of either Crumbana or S. tectus. A dissected male showed different genitalic structures as well. Joel Kits agrees that this appears to be an undescribed species.

Furthermore, the individuals on this page listed as Crumbana arundinea are potentially another cryptic undescribed species very similar to arundinea. Joel Kits notes that "the male genitalia don’t quite match DeLong’s illustration of C. arundinea. I don’t have enough material to compare to know if they are actually different or there is just an error in the illustration. This is quite close to what DeLong illustrated, the only clear difference is the shape of the lateral arm which in DeLong’s illustration curves ventrally then dorsally near the tip, and appears to be pointed, in the specimen I dissected it continues posteriorly then curves ventrally at the tip, which is slightly swollen and rounded."