The Puffer (stencherys gasii)

This species of commuter would be known as Crop Dusters if they were ambulatory.  As on the train they are seated and stationary, they are deemed Puffers.  These creatures tend to be female and inhabit end seats, thus blocking the possible escape of captives.  Puffers generally appear desperately normal, thus lulling their prey into a relaxed state before they strike with their olfactory missiles. This species is characterized by frequent rearranging of belongings in lap.  This behavior is designed as camouflage but instead just produces a wafting effect which disperses the nose bombs uniformly across the row of seats. Due to their dubious cover as normal people, Puffers cannot be avoided usually.  However, disdainful glares will produce an acceptable and satisfying level of shame. If you can still see them through your watering eyes, that is...