The feeding habits of "Bezzia" species are widely unknown, but the little research available suggests "B. nobilis", and other closely related species are predatory, relying on other adults or larvae of other species as food sources. The brine fly "Ephydra thermophylla" was observed as a major prey item for "B. nobilis" flies living in hot springs. Much of the research available suggests larvae of multiple "Bezzia" species including "B. nobilis" seem to especially rely on mosquito larvae as prey. An experiment revealed that "B. nobilis" larvae easily gave up when mosquito larvae fought back. They did not observe any successful consumption of the mosquito larvae during this experiment, instead their lack of aggression led "B. nobilis" larvae to fail in preying on mosquito larvae, unlike another closely related species, "Bezzia" sp. nr. "expolita". "B. nobilis" larvae did not successfully pupate when only given mosquito or other larvae to prey upon, but they did successfully survive on bacteria, protozoa, or dead adult flies. These observations suggest that "B. nobilis" are predatory in nature but prefer easy and immobile prey. "B. nobilis" larvae failed to reach pupation on mosquito larvae alone. "B. nobilis" larvae were observed feeding on dead adult insects. To do this, they burrowed into the bodies of the adults and formed a bolus that they then swallowed. When forming this bolus, the larvae exhibited consistent behavior of a series of rhythmic motions. They gently moved their heads side-to-side, and once this motion stopped, switched to using their mandibles to form the bolus before bringing it into their mouths. Though there is little research available on the mating habits of "B. nobilis", they have been observed to mate in brackish water. The anatomy of female "B. nobilis" flies includes two asymmetric spermathecae chambers. Spermathecae are structures common to Dipteran species in which females are capable of storing sperm. Flies with spermathecae often allocate this sperm to eggs at some time after copulation has occurred. The physical description of male "B. nobilis" is less detailed than that of female adults and focuses on reproductive structures. Male "B. nobilis" adults have short, stout adeagi, that seem to complement the short chamber from which females' spermathecae are accessible.