beetle, cockroach
蜚 centers on a kind of insect: specifically a beetle or cockroach. The two given meanings are both crawling insects, with cockroach being a common household pest.
蜚 combines 虫 (insect) with 非, which likely contributes the sound. The character is used for beetles and cockroaches.
The top part 非 looks like two wings or legs, and the bottom 虫 is an insect. Picture a beetle with its legs spread out, or a cockroach scurrying with its legs visible.
For ヒ, imagine a hissing cockroach: the hiss sound cues ヒ, and the insect hisses as it crawls.
Rhabdoblatta yayeyamana (species of cockroach)
harlequin roach (Neostylopyga Rhombifolia); harlequin cockroach
Surinam cockroach (Pycnoscelus surinamensis)
Rhabdoblatta guttigera (species of cockroach)
Blattella nipponica (species of cockroach)
Eucorydia yasumatsui (species of cockroach)
giant burrowing cockroach (Macropanesthia rhinoceros)